JP5192340B2 - Determination method, determination apparatus, and determination system - Google Patents

Description

  The present invention relates to a determination method, a determination device, and a determination system, and more particularly, to a determination method, a determination device, and a determination system for determining an operator who has performed an operation input received by an operation unit operated by an occupant.

  Various types of devices (for example, car navigation devices) are mounted on the vehicle for the purpose of improving the in-vehicle driving environment. Among various devices, there are devices that must be prohibited from being operated by a switch while the driver is traveling in consideration of safety. However, if all operations are prohibited while the vehicle is running, various operations by passengers in the front passenger seat, which do not cause problems in driving safety even if the device is operated while the vehicle is running, are also prohibited. Therefore, as in Patent Documents 1 and 2, when an operation unit of various devices is operated, a technique for determining an operator using biometric communication and determining whether the operation unit can be operated based on the determination result. Has been developed.

Here, a conventional operator determination method using biometric communication will be briefly described with reference to FIGS. 1 and 2. FIG. 1A is a schematic diagram illustrating an example of an operator determination system using biometric communication.
First, in FIG. 1A, a case where the driver 160 operates the touch sensor 130 that is an operation unit of the car navigation device will be described.
The signal transmission unit 100 transmits a signal that can pass through the human body to the sheet sensor 120. Here, when the driver is seated, the seat sensor 120 and the body of the driver are in contact with each other, so that the signal is energized to the touch sensor 130 via the driver. A signal energized from the touch sensor 130 is received by the signal receiving unit 140 and input to the operator determination unit 150. The operator determination unit 150 analyzes the received signal to determine whether the operator is a driver 160 or a passenger (not shown).

Next, an operator determination method performed by the operator determination unit 150 will be described. FIG. 1B shows signal waveforms of a signal transmitted from the signal transmission unit 100 and a signal received by the signal reception unit 140.
The signal transmission unit 100 transmits the rectangular wave shown in FIGS. 1B and 1A, but the signal waveform of the signal received by the signal reception unit 140 is affected by the resistance of the connection line and the noise and noise. (B) The waveform of (2) is obtained. The operator determination unit 150 determines that the received received signal causes the driver to touch the touch sensor 130 based on the signal voltage of the received signal and the time width (XX seconds) in which the signal voltage exceeds a predetermined value (X [V]). It is determined whether or not 160 is due to an operation, and the operator is determined.

JP 2006-160115 A JP 2008-120221 A

  However, in the methods of Patent Documents 1 and 2 in which an operator is determined using a received signal received by the signal receiving unit 140, if the received signal contains a lot of noise signals, the operator determining unit 150 is not an accurate operator. Cannot judge. As a result, it may cause a malfunction such as erroneously granting the device operating authority to the driver. In particular, when the operation unit is a touch panel, it is easily affected by noise generated by the liquid crystal screen. Also, when an electromagnetic clutch is used, malfunction is likely to occur because it is also affected by pulse noise from the electromagnetic clutch. Furthermore, when a part of the operator's body is in contact with a metal part such as a vehicle body, the signal current from the electrode installed on the seat is transmitted to the metal part of the vehicle via the human body and grounded. As a result, the signal voltage of the received signal is significantly attenuated. As a result, when the signal voltage is used for the operator's determination, the operator's determination accuracy is remarkably lowered due to noise and the operation state of the operator.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a determination method, a determination apparatus, and a determination system that can improve the determination accuracy of an operator.

The determination method according to claim 1 is a determination method for determining an operator who has performed an operation input received by an operation unit operated by an occupant, wherein phase modulation using an information signal representing the occupant and a predetermined spreading code are used. A modulation signal generating step for generating a modulated signal obtained by modulating a carrier wave transmitted to the occupant by spreading modulation using the occupant, and the operation unit receives the operation input of the occupant and is transmitted from the occupant to the operation unit A demodulated signal acquisition step of acquiring a demodulated signal obtained by demodulating the modulated signal by phase demodulation corresponding to the phase modulation performed in the modulated signal generation step and despreading using the spreading code used in the spread modulation; A calculation step for calculating a correlation value between the demodulated signal acquired in the demodulated signal acquisition step and the information signal representing the occupant, and a correlation value calculated in the calculation step. And having a determination step of determining the operator.
According to this configuration, by using spreading and despreading, it is possible to reduce the influence of noise received while the modulated signal is transmitted and received, so that the determination accuracy of the operator is improved.

In the determination method, the modulation signal generation step performs spread modulation using a different spreading code for each occupant to generate a modulation signal that is transmitted simultaneously to the occupant, and a demodulated signal acquisition step includes the occupant's A demodulated signal for each of the occupants is obtained by despreading the modulated signal transmitted to the operation unit from any of the occupants using a different spreading code, and the calculation step is performed for each of the occupants. A correlation value of each occupant is calculated from a demodulated signal and an information signal representing the occupant, and the determining step determines whether the occupant is an operator from the correlation value of each occupant.
According to this configuration, the modulated signal is transmitted to the occupant at the same time, and the operator's determination can be started at the same time as receiving the operation input. Therefore, compared to the case where the modulated signal is sequentially transmitted to the occupant, The time required can be shortened.

In the above determination method, the correlation value between the information signal used for phase modulation in the modulation signal generation step and the demodulation signal acquired by demodulating the modulation signal transmitted to the operation unit in the demodulation signal acquisition step The method further includes a noise determination step for determining the magnitude of noise that has entered the modulation signal during a period from when the modulation signal is transmitted to the occupant until it is transmitted to the operation unit, and the modulation signal generation step includes: Further, at least one or more of the code length of the spreading code and the amplitude of the modulation signal is changed based on the magnitude of the noise determined in the noise determination step.
According to this configuration, the amplitude of the modulation signal and the code length of the spread code can be changed in accordance with the magnitude of noise received during transmission and reception of the modulation signal, so that the determination accuracy of the operator can be improved.

In the above determination method, the modulation signal generation step further includes an attenuation amount acquisition step of acquiring a magnitude of the amplitude of the modulation signal attenuated when the modulation signal generated in the modulation signal generation step passes through the occupant. The generation step changes the amplitude of the modulation signal generated by the modulation signal generation step based on the amplitude of the modulation signal to be attenuated acquired in the attenuation amount acquisition step. To do.
According to this configuration, when the maximum value of the modulation signal is attenuated, the determination accuracy of the operator is further improved by increasing the amplitude of the modulation signal generated in the modulation signal generation step.

  In the determination method, the demodulated signal acquisition step acquires noise generated from a predetermined device that generates noise, and uses the acquired noise to cancel the noise that has entered the modulation signal from the predetermined device. It is characterized by that.

The determination method further includes a noise learning step of learning a noise signal that enters the modulation signal with a period and the period based on an autocorrelation value of the signal acquired from the operation unit to which the modulation signal is not transmitted. The demodulated signal obtaining step obtains a signal obtained by removing the noise signal from the modulated signal transmitted to the operation unit using the noise signal learned by the noise learning step and the period. And
According to the fifth and sixth aspects of the present invention, noise included in the modulation signal received by the operation unit can be removed, so that the determination accuracy of the operator is further improved.

The determination apparatus according to claim 7 is a determination apparatus for determining an operator who has performed an operation input received by an operation unit operated by an occupant, wherein the phase modulation using an information signal representing the occupant and a predetermined spreading code are used. A modulation signal generation unit that generates a modulation signal that modulates a carrier wave transmitted to the occupant by spreading modulation using the occupant, and the operation unit receives the operation input of the occupant and is transmitted from the occupant to the operation unit A demodulated signal acquisition unit for acquiring a demodulated signal obtained by demodulating the modulation signal by phase demodulation corresponding to phase modulation performed by the modulation signal generation unit and despreading using the spreading code used for the spread modulation; A calculating unit that calculates a correlation value between the demodulated signal acquired by the demodulated signal acquiring unit and the information signal representing the occupant; and a determination unit that determines an operator from the correlation value calculated by the calculating unit. The features.
According to this configuration, by using spreading and despreading, it is possible to reduce the influence of noise received while the modulated signal is transmitted and received, so that the determination accuracy of the operator is improved.

The determination system according to claim 8 is a determination system including a determination device that determines an operator who has performed an operation input received by an operation unit operated by an occupant, wherein the determination device transmits a carrier wave transmitted to the occupant. A transmission device that transmits a modulated signal to the occupant; and a reception device that receives the modulation signal when the operation unit receives an operation input of the occupant; and the determination device is an information signal that represents the occupant A modulation signal generating unit that generates a modulated signal obtained by modulating a carrier wave transmitted to an occupant by phase modulation using a predetermined spread code and spreading modulation using a predetermined spreading code; and the occupant signal received by the receiving device as the modulated signal A demodulated signal acquisition unit that acquires a demodulated signal by demodulating by phase demodulation corresponding to the phase modulation performed by the generation unit and despreading using the spreading code used for the spread modulation; A calculation unit that calculates a correlation value between the demodulated signal acquired by the signal acquisition unit and the information signal representing the occupant, and a determination unit that determines an operator from the correlation value calculated by the previous period calculation unit, To do.
According to this configuration, by using spreading and despreading, it is possible to reduce the influence of noise received while the modulated signal is transmitted and received, so that the determination accuracy of the operator is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the determination precision of the operator who performed the operation input received by the operation part which a passenger | crew operates can be improved.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 2 is a system configuration diagram showing a configuration example of an operator determination system to which the present invention is applied.
The operator determination system includes reception devices 30 and 31, transmission devices 20 and 21, and a determination device 60. Further, the liquid crystal circuit 90 and the accessory ECU 70 are connected to the determination system.
The transmission devices 20 and 21 are installed so as to be in contact with the driver 200 and the passenger 210, respectively, and transmit the modulation signal generated by the determination device 60 to the driver 200 and the passenger 210. The installation positions of the transmission devices 20 and 21 may be any positions that can transmit signals to the driver 200 and the passenger 210. For example, it is possible to employ a configuration in which the transmission devices 20 and 21 are installed on a seat, a seat belt, a place where a passenger's feet come into contact when the passenger is seated on the seat (hereinafter referred to as feet), a door, or the like. In addition, in this embodiment, for simplification of explanation, a case where there is one passenger sitting in the passenger seat will be described, but a transmission device is installed on the rear seat, the side of the console box, the feet of the rear seat, and the like. Thus, it is possible to determine the operator of the passenger sitting in the rear seat. As the transmission devices 20 and 21, for example, an electrode, a sheet sensor, or the like can be used.
Furthermore, the transmission devices 20 and 21 can be divided into two. One of the two divided transmission devices 20 and 21 transmits the modulation signal generated by the determination device 60 to the driver 200 and the passenger 210, and the other acquires the modulation signal that has passed through the driver 200 and the passenger 210. The acquired modulation signal is input to the determination device 60. Thereby, the magnitude | size of the amplitude of the modulation signal attenuate | damped when a modulation signal passes the driver | operator 200 and the passenger 210 can be acquired.

The receiving devices 30 and 31 are installed in the operation unit 32 and the operation unit 33, respectively. Here, the operation units 32 and 33 may be an operation unit that receives an operation input to a device mounted on the vehicle, or may be an operation unit that receives a driving operation on the vehicle. Devices mounted on the vehicle include, for example, a car navigation device and a music playback device. The operation units 32 and 33 include, for example, a touch panel and a mechanical switch. In addition, in this embodiment, for the sake of simplicity of explanation, two sets of operation units and reception devices of the operation units 32 and 33 and the reception devices 30 and 31 are used, but the operation unit and the operation unit constituting the determination system are used. The number of receivers to be installed may be one or two or more.
The receiving devices 30 and 31 receive the modulation signals transmitted from the transmitting devices 20 and 21 to the driver 200 and the passenger 210 when the operation units 32 and 33 receive an operation input from the driver 200 or the passenger 210. To do. Then, the transmission devices 20 and 21 input the received modulation signal to the determination device 60. As the receiving devices 30 and 31, for example, an electrode or a touch sensor can be used.

The determination device 60 includes a modulation signal generation circuit 10, a demodulation signal acquisition circuit 40, and a microcomputer 50. Further, a liquid crystal circuit 90 and an accessory ECU (Electronic Control Unit) 70 are connected to the determination device 60.
The modulation signal generation circuit 10 is connected to the transmission devices 20 and 21, the demodulated signal acquisition circuit 40, and the microcomputer 50. Although the configuration and modulation method of the modulation signal generation circuit 10 will be described later, the modulation signal generation circuit 10 generates modulation signals transmitted from the transmission devices 20 and 21 to the driver 200 and the passenger 210, and the transmission devices 20 and 21. Output to. Further, the modulation signal generation circuit 10 transmits information necessary for demodulation processing of a demodulation signal acquisition circuit 40 described later to the demodulation signal acquisition circuit 40. Further, the modulation signal generation circuit 10 transmits information used for operator determination of the microcomputer 50 to the microcomputer 50. On the other hand, the modulation signal generation circuit 10 changes the spread code used to generate the modulation signal based on a command for controlling the generation of the modulation signal input from the microcomputer 50, or changes the amplitude of the modulation signal. Change process to change.

  The demodulated signal acquisition circuit 40 is connected to the modulation signal generation circuit 10, the receiving devices 30 and 31, the microcomputer 50, and the liquid crystal circuit 90. Here, the liquid crystal circuit 90 is a circuit for controlling the liquid crystal screen when the operation units 32 and 33 are liquid crystal screens. First, the demodulation signal acquisition circuit 40 inputs information necessary for demodulation from the modulation signal generation circuit 10. Next, the demodulated signal acquisition circuit 40 demodulates the modulated signal input by the receiving device 30 and the receiving device 31 based on the modulation scheme of the modulated signal generation circuit 10 and acquires the demodulated signal. The configuration and demodulation method of the demodulated signal acquisition circuit 40 will be described later. Thereafter, the demodulated signal acquisition circuit 40 outputs the acquired demodulated signal to the microcomputer 50. The demodulated signal acquisition circuit 40 acquires a signal emitted from the liquid crystal circuit 90 from the liquid crystal circuit 90 and acquires a noise signal learned by the microcomputer 50 (details will be described later) from the microcomputer 50. Then, using the acquired signal and noise signal, noise that has entered the modulation signal in the process of transmitting and receiving the modulation signal is removed from the modulation signal input from the receiving devices 30 and 31.

The microcomputer 50 is connected to the modulation signal generation circuit 10, one of the two divided transmission devices 20 and 21, the demodulated signal acquisition circuit 40, the reception devices 30 and 31, and the accessory ECU 70. The microcomputer 50 determines the operator using the demodulated signal input from the demodulated signal acquisition circuit 40 and the information necessary for the operator determination input from the modulation signal generation circuit 10. The operator determination process will be described later. After determining the operator, the microcomputer 50 outputs the determination result to the accessory ECU 70. Here, the accessory ECU 70 is a control device that controls the accessory device. The accessory ECU 70 receives the determination result of the microcomputer 50 and controls whether to accept the operation of the accessory device. In this embodiment, the microcomputer 50 is connected to the accessory ECU 70, but the connection destination is not limited to the accessory ECU 70, and is connected to another control device that controls the permission of operation input to the operation unit. Can do.
In addition, the microcomputer 50 compares the modulation signal generated by the modulation signal generation circuit 10 with the modulation signal input from one of the transmission devices 20 and 21 divided into two, and determines the driver 200 and the passenger 210. The magnitude of the amplitude of the modulation signal that attenuates by passing is acquired. The microcomputer 50 outputs information indicating the magnitude of the amplitude of the acquired modulation signal to the modulation signal generation circuit 10. The modulation signal generation circuit 10 changes the amplitude of the modulation signal based on the input from the microcomputer 50.
Further, the microcomputer 50 inputs a signal while the receiving device 30 and the receiving device 31 are not receiving the modulation signal, and executes a noise learning process for learning a noise signal generated periodically (details will be described later). Next, the microcomputer 50 outputs the learned noise signal to the demodulated signal acquisition circuit 40. The demodulated signal acquisition circuit 40 uses the noise signal acquired from the microcomputer 50 to remove noise included in the modulation signal from the modulation signal.

Next, the modulation signal generation circuit will be further described with reference to FIG. FIG. 3 is a diagram showing an example of the configuration of the modulation signal generation circuit 10.
The modulation signal generation circuit 10 includes a timing signal generation circuit 11, an information signal generation circuit 12, a phase modulation circuit 13, a spread code generation circuit 14, a spread circuit 15, an amplifier 16, and a carrier wave generation circuit 17.
The timing signal generation circuit 11 is connected to the carrier wave generation circuit 17, the spread code generation circuit 14, and the information signal generation circuit 12. The timing signal generation circuit 11 receives a carrier wave from the carrier wave generation circuit 17. Next, the timing signal generation circuit 11 transmits a timing signal to the information signal generation circuit 12 and the spread code generation circuit 14 based on the period of the carrier wave. The information signal generation circuit 12 and the spread code generation circuit 14 generate an information signal and a spread code based on the timing signal.

  The information signal generation circuit 12 is a circuit that generates an information signal representing an occupant. The information signal generation circuit 12 is connected to the timing signal generation circuit 11, the phase modulation circuit 13, and the microcomputer 50. The information signal generation circuit 12 receives the timing signal from the timing signal generation circuit 11 described above, and generates an information signal based on the timing. Then, the information signal generation circuit 12 transmits the information signal to the phase modulation circuit 13 that performs phase modulation using the information signal. Here, the information signal may be different for each of the driver 200 and the passenger 210, or may be the same signal. Further, the information signal generation circuit 12 outputs the information signal generation circuit 12 to the microcomputer. This is because the microcomputer 50 uses the information signal for the operator's determination.

  The phase modulation circuit 13 is a circuit that performs phase modulation based on an input signal. The phase modulation circuit 13 is connected to the carrier wave generation circuit 17, the information signal generation circuit 12, and the spreading circuit 15. The phase modulation circuit 13 phase-modulates the carrier wave input from the carrier wave generation circuit 17 based on the information signal input from the information signal generation circuit 12. The phase modulation method includes two-phase phase modulation, four-phase phase modulation, and the like, and can be appropriately selected. In this embodiment, two-phase phase modulation is adopted as a phase modulation method. The phase modulation circuit 13 outputs the phase-modulated signal to the spreading circuit 15 in order to spread the spectrum.

  The spreading code generation circuit 14 is a circuit that generates a spreading code used for spreading a signal input to the spreading circuit 15. The spread code generation circuit 14 is connected to the timing signal generation circuit 11, the spread circuit 15, the microcomputer 50, and the demodulated signal acquisition circuit 40. The spread code generation circuit 14 receives the timing signal from the timing signal generation circuit 11 described above, and generates a spread code based on the timing signal. Here, the spread code generation circuit 14 can generate a different spread code for each driver 200 and passenger 210, or can generate the same spread code. Next, the spreading code generation circuit 14 outputs the generated spreading code to the spreading circuit 15 and the demodulated signal acquisition circuit 40. The spreading circuit 15 uses the spreading code received from the spreading code generation circuit 14 for spreading the input signal. On the other hand, the demodulated signal acquisition circuit 40 uses the spreading code received from the spreading code generation circuit 14 for despreading the modulation signal. Further, the spread code generation circuit 14 transmits the head signal of the spread code cycle to the timing signal generation circuit 11 and the microcomputer 50. Thereby, the microcomputer 50 can acquire the timing which determines an operator. Further, the spread code generation circuit 14 receives a signal indicating whether or not to change the code length of the spread code from the microcomputer 50, and changes the code length of the spread code to be generated.

  The spread circuit 15 is connected to the phase modulation circuit 13, the spread code generation circuit 14, and the amplifier 16. The spreading circuit 15 spreads the carrier wave phase-modulated by the phase modulation circuit 13 using the spreading code from the spreading code generation circuit 14. Thereby, a signal resistant to noise can be generated. Next, the spreading circuit 15 outputs to the amplifier 16 in order to change the amplitude of the spread signal. In the following description, a signal subjected to phase modulation and spreading is referred to as a modulation signal. In this embodiment, the diffusion is performed after the phase modulation, but a similar modulation signal can be generated even if the phase modulation is performed after the diffusion.

  The amplifier 16 is connected to the diffusion circuit 15, the transmission devices 20 and 21, and the microcomputer 50. The amplifier 16 amplifies the amplitude of the modulation signal input from the spreading circuit 15. Next, the modulated signal whose amplitude has been amplified is output to the transmission devices 20 and 21 and the microcomputer 50.

Next, the demodulated signal acquisition circuit will be described with reference to FIG. FIG. 4 is a diagram showing an example of the configuration of the demodulated signal acquisition circuit 40.
The demodulated signal acquisition circuit 40 includes a noise removal circuit 46, filters 41, 43 and 45, a despreading circuit 42, and a phase demodulation circuit 44.
The noise removal circuit 46 is connected to the receiving device 30, the filter 41, the noise learning unit 505 (details will be described later) of the microcomputer 50, and the liquid crystal circuit 90. The noise removal circuit 46 is a circuit that removes noise included in the modulation signal from the modulation signals input from the receiving devices 30 and 31. The noise removing circuit 46 acquires a signal generated by the liquid crystal circuit 90 from the liquid crystal circuit 90, and removes noise from the modulation signal using the acquired signal. In addition, the noise removal circuit 46 acquires a periodic noise signal learned by the noise learning unit 505 from the noise learning unit 505, and removes noise from the modulation signal using the acquired periodic noise signal. Next, the noise removal circuit 46 outputs the modulated signal from which noise has been removed to the filter 41. The filter 41 extracts a signal having a predetermined frequency from the modulation signal input from the noise removal circuit 46 and outputs the signal to the despreading circuit 42.

  The despreading circuit 42 is connected to the spreading code generation circuit 14 constituting the modulation signal generation circuit 10, the filter 41 and the filter 43. The despreading circuit 42 despreads the modulation signal input from the filter 41. For despreading, it is necessary to use the spreading code used by the spreading circuit 15 for spreading in the modulation signal generation circuit 10. Therefore, the despreading circuit 42 acquires the spreading code from the spreading code generation circuit 14 and performs despreading. The despreading circuit 42 outputs the modulated signal after despreading to the filter 43. The filter 43 extracts a signal having a predetermined frequency from the despread modulation signal input from the despreading circuit 42 and outputs the signal to the phase demodulation circuit 44.

  The phase demodulation circuit 44 is connected to the filter 43 and the filter 45. The phase demodulation circuit 44 performs phase demodulation on the modulated signal after despreading based on the phase modulation method of the phase modulation circuit 13 to obtain a demodulated signal. Next, the phase demodulation circuit 44 outputs the demodulated signal to the filter 45. The filter 45 extracts a signal having a predetermined frequency from the demodulated signal and outputs it to the microcomputer 50.

Here, with reference to FIG. 5A, a signal acquired through processing in each configuration of the modulation signal generation circuit 10 and the demodulated signal acquisition circuit 40 will be briefly described.
FIG. 5A is a diagram showing an example of the signal waveform at each point indicated by alphabets in FIGS. 3 and 4. The horizontal axis in the figure represents time. Moreover, the alphabet described in the left part of a signal waveform respond | corresponds with the alphabet of each point described in FIG.3 and FIG.4.

  First, the modulation signal generated in the modulation signal generation circuit 10 will be described. The carrier wave generated by the carrier wave generation circuit 17 is a periodic signal as indicated by A. The timing signal generation circuit 11 generates a timing signal as indicated by C in a form corresponding to the period of the carrier wave. The information signal generation circuit 12 generates an information signal as shown in B, for example, based on the timing signal. The phase modulation circuit 13 performs phase modulation on the carrier wave indicated by A using the information signal indicated by B, and outputs the phase modulation signal indicated by D to the spreading circuit 15. The spreading code generation circuit 14 generates a spreading code indicated by E based on the timing signal indicated by C. Further, as indicated by G, the head signal of the spreading code period is output to the microcomputer 50 and the timing signal generation circuit 11. The spreading circuit 15 spreads the phase modulation signal indicated by D using the spreading code indicated by E. As a result of phase modulation and spreading, a modulated signal as indicated by F can be obtained.

Next, the demodulated signal acquired by the demodulated signal acquisition circuit 40 will be described. The modulated signal input from the receiving device 30 to the demodulated signal acquisition circuit 40 passes through the noise removal circuit 46 and the filter 41 and becomes a signal as indicated by H. The despreading circuit 42 performs despreading on the modulated signal from which noise has been removed, using a spreading code indicated by E. A signal indicated by I is acquired by despreading. When the phase demodulation circuit 44 performs phase demodulation on the despread signal, the signal indicated by J can be acquired. The filter 45 extracts a signal having a predetermined frequency from the signal indicated by J, whereby a demodulated signal can be obtained, and the demodulated signal is indicated by K.
As is clear from FIG. 5A, the information signal shown in B and the demodulated signal obtained by demodulating the modulation signal received from the receiving device shown in K theoretically match. However, in practice, it is difficult to completely remove the noise included in the modulated signal, so that the demodulated signal indicated by K does not completely match the information signal indicated by B.

Next, the microcomputer will be described with reference to FIGS. FIG. 6 is a diagram illustrating an example of a hardware configuration of the microcomputer 50.
The microcomputer 50 implements an input / output unit 54 that performs signal input / output, a central processing unit (CPU) 55 that reads and executes a stored program, and an operator process performed by the microcomputer 50 to be described later. A ROM (Read Only Memory) 57 that stores programs and the like, and a RAM (Random Access Memory) 56 that stores temporary data used when executing the programs are configured.

The program stored in the ROM 57 is executed by the CPU 55. Based on the demodulated signal from the demodulated signal acquisition circuit 40 and the like, predetermined determination processing and the like are performed by this program. Further, data used in the determination process is stored in the RAM 56 and used for subsequent processes.
Further, a correlation value calculation unit 501, an operator determination unit 502, an attenuation amount acquisition unit 503, a noise determination unit 504, and a noise learning unit 505 shown in FIG. 7 are configured by calculation by the CPU 55 of the program stored in the ROM 57.

FIG. 7 is an example of a functional block diagram of the microcomputer 50 realized by the cooperation of the above-described hardware such as the CPU 55 and software stored in the ROM 57.
The microcomputer 50 includes a correlation value calculation unit 501, an operator determination unit 502, a noise determination unit 504, an attenuation amount acquisition unit 503, and a noise learning unit 505.
Correlation value calculator 501 calculates a correlation value between the demodulated signal and the information signal. Correlation value calculation section 501 is connected to demodulated signal acquisition circuit 40, information signal generation circuit 12, spread code generation circuit 14, operator determination section 502, and noise determination section 504.
The correlation value calculation unit 501 acquires a demodulated signal from the demodulated signal acquisition circuit 40, acquires an information signal from the information signal generation circuit 12, and calculates a correlation value between the demodulated signal and the information signal. The correlation value calculation unit 501 performs correlation value calculation when the leading signal of the period of the spreading code generated by the spreading code generation circuit 14 is input. Next, the correlation value calculation unit 501 outputs the calculated correlation value to the operator determination unit 502 and the noise determination unit 504. The operator determination unit 502 determines an operator who has received an operation input by the operation units 31 and 32 based on the input correlation value. Further, the noise determination unit 504 determines the magnitude of noise included in the modulated signal based on the correlation value.

  The operator determination unit 502 determines an operator who has received an operation input by the operation units 32 and 33. The operator determination unit 502 is connected to the correlation value calculation unit 501, the spread code generation circuit 14, and the accessory ECU 70. The operator determination unit 502 receives an input of a correlation value from the correlation value calculation unit 501 and determines an operator based on the correlation value. The operator determination unit 502 calculates a correlation value when the first signal of the cycle of the spread code generated by the spread code generation circuit 14 is input. As described above, the information signal representing the occupant matches the demodulated signal if there is no influence of noise or the like. Therefore, the greater the correlation value between the information signal and the demodulated signal, the higher the degree of similarity between the information signal and the demodulated signal. Therefore, the operator determination unit 502 can determine the operator based on the correlation value. The operator determination unit 502 outputs the determination result to the accessory ECU 70 after the operator's determination. The accessory ECU 70 controls whether or not each operation unit may accept an operation input in response to the determination result of the operator.

  The noise determination unit 504 is connected to the correlation value calculation unit 501, the spread code generation circuit 14, and the amplifier 16. The noise determination unit 504 acquires a correlation value from the correlation value calculation unit 501. As described above, the greater the correlation value, the higher the degree of similarity between the information signal and the demodulated signal. However, if the noise contained in the modulated signal is large, or if the noise contained in the modulated signal cannot be removed sufficiently, the degree of similarity between the demodulated signal and the information signal will be low, and the correlation value will be small. Become. Therefore, the noise determination unit 504 determines the magnitude of noise included in the modulation signal based on the correlation value. Based on the determination result, the noise determination unit 504 outputs a signal instructing to increase the code length of the spread code to the spread code generation circuit 14 in order to reduce the influence of noise. Alternatively, the noise determination unit 504 outputs a signal that instructs the amplifier 16 to increase the amplitude of the modulation signal. The noise determination unit 504 may instruct only the spreading code generation circuit 14 to increase the code length of the spreading code, or may instruct only the amplifier 16 to increase the amplitude of the modulation signal. However, it is also possible to instruct both of them.

  The attenuation amount acquisition unit 503 is connected to the transmission device 20 and the amplifier 16. The attenuation amount acquisition unit 503 acquires the modulated signal that has passed through the occupant from one of the transmission device 20 divided into two and one of the transmission devices 20. Further, the attenuation amount acquisition unit 503 acquires the modulation signal before being output to the transmission devices 20 and 21 from the amplifier 16. The attenuation amount acquisition unit 503 can acquire an attenuation amount by which the magnitude of the signal of the modulation signal transmitted to the transmission devices 20 and 21 is attenuated by passing through the occupant by comparing the two modulation signals. it can. When the attenuation amount is large, the attenuation amount acquisition unit 503 instructs the amplifier 16 to increase the amplitude of the modulated signal before being output to the transmission device. The amplifier 16 that has received a command from the attenuation acquisition unit 503 increases the amplitude of the modulation signal.

  The noise learning unit 505 is connected to the receiving devices 30 and 31 and the demodulated signal acquisition circuit 40. Signals received by the receiving devices 30 and 31 that have not received the modulation signal are acquired. Most of the signals received by the receiving devices 30 and 31 when no modulated signal is received are noise signals. For this reason, the noise learning unit 505 obtains a periodically generated noise signal and its period based on the autocorrelation values of the signals acquired from the receiving devices 30 and 31. Hereinafter, obtaining a noise signal periodically generated based on the autocorrelation value and its period is referred to as learning. The noise learning unit 505 outputs the learned noise signal to the demodulated signal acquisition circuit 40 using the period of the noise signal. The demodulated signal acquisition circuit 40 uses the noise signal from the noise learning unit 505 to remove noise from the modulated signals input from the receiving devices 30 and 31.

Here, the timing at which the correlation value calculation unit 501 calculates the correlation value and the timing at which the operator determination unit 502 determines the operator will be described using FIG. 5B again.
The alphabets in FIG. 5B correspond to the alphabets described in FIGS. As described above, the spread code generation circuit 14 outputs the first signal of the spread code period to the correlation value calculation unit 501 and the operator determination unit 502 as indicated by G. Correlation value calculation section 501 calculates the correlation value at the timing of the signal received from spreading code generation circuit 14. Note that L represents the calculated correlation value. The operator determination unit 502 determines the operator at the timing of the signal received from the spread code generation circuit 14 based on the correlation value indicated by L.

Next, an example of an operator determination process performed by the determination device 60 will be described with reference to FIGS. 8 and 9.
FIG. 8 is a flowchart illustrating an example of processing in which the modulation signal generation circuit 10 generates a modulation signal.
First, the modulation signal generation circuit 10 generates a modulation signal to be output to the transmission device 20 in the driver's seat. The modulation signal generation circuit 10 modulates the phase of the carrier wave output from the carrier wave generation circuit 17 with the information signal generated by the information signal generation circuit 12 (step S1). A phase modulation circuit 13 is used for the phase modulation. Next, the modulation signal generation circuit 10 performs spreading on the phase-modulated signal using the spreading code generated by the spreading code generation circuit 14 (step S2). A diffusion circuit 15 is used for the diffusion. Thereafter, the modulation signal generation circuit 10 outputs the modulation signal to the transmission device 20 installed in the driver's seat via the amplifier 16 (step S3).
After outputting the modulation signal to the transmission device 20 in the driver's seat, the modulation signal generation circuit 10 generates a modulation signal to be output to the transmission device 21 in the passenger seat. Steps S4 and S5 are the same as steps S1 and S2 described above. Next, the modulation signal generation circuit 10 outputs the modulation signal to the transmission device 21 installed in the passenger seat via the amplifier 16 (step S6). Thereafter, the modulation signal generation circuit 10 ends the execution of the process for generating the modulation signal.

Next, processing after the modulated signal transmitted to the passenger is input from the receiving devices 30 and 31 to the determining device 60 will be described. FIG. 8 is a flowchart illustrating an example of processing performed by the demodulated signal acquisition circuit 40 and the microcomputer 50.
The demodulated signal acquisition circuit 40 and the microcomputer 50 first process the modulated signal transmitted to the transmission device 20 in the driver's seat to determine the operator.
The demodulated signal acquisition circuit 40 that has acquired the modulation signal from the receivers 30 and 31 removes the noise signal from the modulation signal using the noise removal circuit 46 (step S101). The noise signal is removed using the signal acquired from the liquid crystal circuit 90 and the periodic noise signal learned by the microcomputer 50 as described above.
Next, the demodulated signal acquisition circuit 40 performs filtering by a band pass filter (BPF) to extract a signal having a predetermined frequency (step S102). Next, the demodulated signal acquisition circuit 40 despreads the modulation signal using the despreading circuit 42 (step S103), and performs filtering by BPF again (step S104). Thereafter, the demodulated signal acquisition circuit 40 performs phase demodulation using the phase demodulation circuit 44 (step S105), and performs filtering using a low-pass filter (LPF) (step S106). By performing steps S101 to S106, a demodulated signal in which the influence of noise on the modulated signal is reduced can be obtained.

Next, the microcomputer 50 acquires the demodulated signal acquired by the demodulated signal acquisition circuit 40 and calculates the correlation value between the demodulated signal and the information signal (step S107). Thereafter, the microcomputer 50 compares the calculated correlation value with a predetermined threshold value (step S108). Here, the predetermined threshold is a value of a correlation value that can be considered that the demodulated signal is the same as the information signal representing the occupant, and that the occupant corresponding to the information signal is the operator. For example, 0.7 or 0.8 can be used as the predetermined threshold value.
When the correlation value exceeds the threshold value (step S108 / YES), the microcomputer 50 determines that the driver is an operator (step S109). If the correlation value does not exceed the threshold value (step S108 / NO), it is determined that the driver is not an operator (step S110). The microcomputer 50 outputs the determination result to another control device that controls the operation input of the operation unit such as the accessory ECU 70.

Next, the demodulated signal acquisition circuit 40 and the microcomputer 50 perform the same processing on the modulated signal output to the transmission device 21 in the passenger seat. Since the processing from step S111 to step S118 is the same as the processing from step 101 to step 108, description thereof is omitted. If the correlation value exceeds the threshold value (step S118 / YES), the microcomputer 50 determines that the passenger is an operator (step S119). If the correlation value does not exceed the threshold value (step S118 / NO), it is determined that the driver is not an operator (step S120).
The CPU that executes the process of calculating the correlation values in step S107 and step S117 corresponds to the correlation value calculation unit 501. The CPU that executes the process of determining the operator in step S109, step S110, step S119, and step S120 corresponds to the operator determination unit 502.

  In the above-described flowchart, the modulation signal generation circuit 10 sequentially generates and outputs the modulation signal output to the driver 200 and the modulation signal output to the passenger 210. Further, the demodulated signal acquisition circuit 40 and the microcomputer 50 sequentially execute the acquisition of the demodulated signal and the determination as to whether the driver 200 and the passenger 210 are operators. In other words, the operator is determined using time division in which the transmission destination of the modulation signal is changed every time. In this case, in order to determine whether or not the passenger 210 is an operator, it is necessary to wait for the modulation signal generation circuit 10 to output a modulation signal to the transmission device of the passenger 210. Therefore, the receiver 30 and the passenger 210 can use the code division for simultaneously transmitting the modulated signals, which are spread and modulated using different spreading codes, to the driver 200 and the passenger 210, respectively. An example of processing for determining the operator at the same time that 31 receives the modulated signal will be described with reference to FIGS.

FIG. 10 is a flowchart illustrating an example of processing performed by the modulation signal generation circuit 10. The processing performed by the modulation signal generation circuit 10 is basically the same as the flowchart shown in FIG. Therefore, only differences from the flowchart shown in FIG. 8 will be described.
First, in the phase modulation in the phase modulation circuit 13, the modulation signal generation circuit 10 performs phase modulation on the carrier wave using information signals prepared for the driver 200 and the passenger 210 (steps S11 and S21). However, the information signal (driver's seat information signal) representing the driver and the information signal (passenger seat information signal) representing the passenger may be the same or different. Next, the modulation signal generation circuit 10 performs spread modulation using different spread codes for the driver 200 and the passenger 210 (step S12 and step S22). Hereinafter, the spreading code for the driver 200 is referred to as a driver seat spreading code, and the spreading code for the passenger 210 is referred to as a passenger seat spreading code. Note that the spreading code for the driver seat and the spreading code for the passenger seat must use different spreading codes. Therefore, the modulation signal generation circuit 10 generates different modulation signals for the driver 200 and the passenger 210. Next, the modulation signal generation circuit 10 simultaneously outputs different modulation signals for the driver 200 and the passenger 210 to each of the transmitting device 20 in contact with the driver 200 and the transmitting device 21 in contact with the passenger 210 (step). S13 and step S23).

Next, an example of processing performed by the demodulated signal acquisition circuit 40 and the microcomputer 50 will be described. FIG. 11 is a flowchart showing an example of processing performed by the demodulated signal acquisition circuit 40 and the microcomputer 50. FIG. 11A is a flowchart for determining whether or not the driver is an operator, and FIG. 11B is a flowchart for determining whether or not the passenger is an operator. The processing performed by the demodulated signal acquisition circuit 40 and the microcomputer 50 is basically the same as the flowchart shown in FIG. Therefore, only differences from the flowchart shown in FIG. 9 will be described.
First, in the demodulated signal acquisition circuit 40, the despreading circuit 42 performs despreading using different spreading codes for the driver 200 and the passenger 210 (step S123 and step S143). This is because the modulation signal generation circuit 10 generates modulation signals using different spreading codes for the driver 200 and the passenger 210. Therefore, for example, when the receiving device 30 and the receiving device 31 receive the modulated signal transmitted to the driver 200, if the despreading is performed using the driver seat spreading code, the driving is performed by the subsequent phase demodulation (step S125). A demodulated signal close to the seat information signal is obtained. However, when despreading is performed using the passenger seat spreading code, a demodulated signal different from the passenger seat information signal is obtained even if the phase demodulation (step S145) is performed.
Next, the microcomputer 50 calculates a correlation value between the demodulated signal acquired using the driver seat spreading code and the driver seat information signal (step S127). In addition, a correlation value between the demodulated signal acquired using the passenger seat spread signal and the passenger seat information signal is calculated (step S147). If the modulated signal received from the receivers 30 and 31 is not a modulated signal obtained by spreading with the spreading code used for the despreading in step S143, the demodulated signal corresponding to the information signal cannot be obtained, so the correlation value is small. Become. According to this configuration, it is possible to determine in parallel whether the driver 200 and the passenger 210 are operators. Further, according to this configuration, the time required for the operator's determination can be shortened as compared with the case where the modulation signal is sequentially transmitted to the driver 200 and the passenger 210.
Note that the CPU that executes the process of calculating the correlation values in step S127 and step S147 corresponds to the correlation value calculation unit 501. The CPU that executes the process of determining the operator in steps S129, S130, S149, and S150 corresponds to the operator determination unit 502.

Next, processing executed by the microcomputer 50 in order to further improve the determination accuracy of the operator by changing the modulation signal generation circuit 10 will be described with reference to FIGS. 12 and 13. FIG. 12 is a flowchart illustrating an example of a process in which the microcomputer 50 acquires information necessary for the change process of the modulation signal generation circuit 10.
The microcomputer 50 compares the correlation value between the demodulated signal and the information signal with a predetermined threshold value (step S161). Here, the predetermined threshold value is a value of a correlation value that can be determined that a demodulated signal sufficient for determining the operator is obtained, and can be set to 0.5, for example. This is when the correlation values for determining whether the driver 200 and the passenger 210 are operators are both equal to or less than the threshold value even though the modulation signals are input from the receiving devices 30 and 31. This is because the influence of noise or the like included in the modulation signal is large, and a demodulated signal sufficient to determine the operator is not obtained, so that it is considered that an accurate operator determination cannot be performed. .
Therefore, the microcomputer 50 outputs a command for increasing the code length of the spread code to the spread code generation circuit 14 and a command for increasing the amplitude of the modulation signal to the amplifier 16 in order to reduce the influence of noise and the like. Any one or more of the outputs are executed (step S162). The spread code generation circuit 14 that has received a command from the microcomputer 50 increases the code length of the spread code, and the amplifier 16 can increase the amplitude of the modulation signal. According to this configuration, the influence of noise entering the modulation signal can be reduced by increasing the code length of the spreading code for generating the modulation signal and the amplitude of the modulation signal, so that the determination accuracy of the operator is further improved.
Next, the microcomputer 50 compares the amplitude of the modulation signal output to the transmission device by the modulation signal generation circuit 10 with the amplitude of the modulation signal acquired from one of the transmission devices 20 and 21 divided into two (steps). S163). In step S163, the magnitude (attenuation amount) of the amplitude that attenuates when the modulated signal passes through the passenger is acquired. The reason why the modulation signal that has passed through the occupant is attenuated may be that the occupant is grounded by touching a metal part such as a vehicle body. Therefore, the microcomputer 50 outputs the attenuation amount to the amplifier 16 (step S164). The amplifier 16 that has acquired the attenuation amount from the microcomputer 50 increases the amplitude of the modulation signal. According to this configuration, when the attenuation amount of the amplitude of the modulation signal acquired by the microcomputer 50 is large, the amplifier 16 increases the amplitude of the modulation signal, and the amplitude of the modulation signal attenuates by passing through the passenger. Can be supplemented.
Here, the CPU that executes the process of step S <b> 162 corresponds to the noise determination unit 504. Further, the CPU that executes the processes of step S163 and step S164 corresponds to the attenuation amount acquisition unit 503.

FIG. 13 is a flowchart illustrating an example of noise learning processing for realizing the noise learning unit 505.
First, the microcomputer 50 acquires a signal generated by the receiving devices 30 and 31 that have not received the modulation signal (step S171). Next, the microcomputer 50 calculates the autocorrelation value of the acquired signal (step S172). After calculating the autocorrelation value, the microcomputer 50 acquires (learns) the periodic noise signal and the period included in the signals emitted from the receiving devices 30 and 31 based on the autocorrelation value (step S172). The microcomputer 50 outputs the learned noise signal to the demodulated signal acquisition circuit 40 at the acquired cycle (step S174). A noise removal circuit 46, which is a component of the demodulated signal acquisition circuit 40, removes the noise signal from the modulation signal using the noise signal input from the microcomputer 50.
Most of the signals received by the receiving devices 30 and 31 that have not received the modulation signal are noise signals. Therefore, according to this configuration, the noise signal is learned in advance, and the learned noise signal is input to the noise removal circuit 46, which is a component of the demodulated signal acquisition circuit 40, so that the noise signal included in the modulation signal is converted. Can be removed. Further, according to this configuration, a demodulated signal closer to the information signal can be acquired by demodulating the modulated signal from which the noise signal has been removed, so that the determination accuracy of the operator is further improved.
Note that the CPU that executes the processing of steps S171 to S174 corresponds to the noise learning unit 505.

As is clear from the above description, according to the present embodiment, the modulation signal generation circuit 10 performs spreading, and the demodulated signal acquisition circuit 40 performs despreading, so that the modulation signal receives the noise received in the transmission / reception process. Since the influence can be reduced, the determination accuracy of the operator is improved.
Furthermore, by receiving the modulated signal from the receivers 30 and 31 by simultaneously transmitting to the driver 200 and the passenger 210 a modulated signal spread using different spreading codes for the driver 200 and the passenger 210. The operator determination process can be started. Thereby, the time required for the operator's determination can be shortened.
Further, the modulation signal is modulated by changing the modulation signal using the noise level determined by the noise determination unit 504 based on the correlation value, thereby modulating the modulation signal corresponding to the noise level received while the modulation signal is transmitted and received. It can generate | occur | produce in a signal generation step, and can further improve an operator's determination precision. Furthermore, the determination accuracy of the operator can also be improved by changing the amplitude of the modulation signal based on the attenuation amount of the modulation signal determined by the attenuation acquisition unit 503.
Further, by using the signal generated from the liquid crystal circuit 90 and the noise signal learned by the noise learning unit 505, the noise removal circuit 46 removes the noise signal included in the modulation signal before demodulating the modulation signal, thereby further increasing the operator. The determination accuracy can be improved.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments according to the present invention, and various modifications are possible within the scope of the gist of the present invention described in the claims.・ Change is possible. For example, the determination device 60 can acquire a modulation signal from one of the transmission devices 20 divided into two and one of the transmission devices 20, and can perform occupant detection.

The determination method of the present invention can be realized by using the determination device 60 described above.
The program executed by the determination device 60 can be provided by storing and distributing it in a magnetic disk, an optical disk, a semiconductor memory, or other recording medium, or distributing it via a network.
Furthermore, a part or all of the software processing realized by the microcomputer 50 reading out the software program stored in the ROM 57 and executed by the CPU 55 may be realized by hardware. Further, part or all of the hardware constituting the modulation signal generation circuit 10 and the demodulated signal acquisition circuit 40 may be realized by software.

It is a figure explaining an example of the conventional operator determination method. It is a block diagram which shows an example of a structure of the determination system with which this invention is applied. It is a block diagram which shows an example of a structure of a modulation signal generation circuit. It is a block diagram which shows an example of a structure of a demodulation signal acquisition circuit. It is an example of the signal waveform acquired with the determination apparatus to which this invention is applied. It is a figure which shows an example of the hardware constitutions of a microcomputer. It is a functional block diagram which shows an example of the function which a microcomputer has. It is a flowchart which shows an example of the process which a modulation signal generation circuit performs. It is a flowchart which shows an example of the process which a demodulation signal acquisition circuit and a microcomputer perform. It is a flowchart which shows an example of the process which a modulation signal generation circuit performs. It is a flowchart which shows an example of the process which a demodulation signal acquisition circuit and a microcomputer perform. It is a flowchart which shows an example of the control processing which a microcomputer performs. It is a flowchart which shows an example of the learning process which a microcomputer performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Modulation signal generation circuit 11 ... Timing signal generation circuit 12 ... Information signal generation circuit 13 ... Phase modulation circuit 14 ... Spreading code generation circuit 15 ... Spreading circuit 16 ... Amplifier 17 ... Carrier wave generation circuit 20, 21 ... Transmitting device 30, 31 Receiving devices 32, 33 ... operation unit 40 ... demodulated signal acquisition circuits 41, 43, 45 ... filter 42 ... despreading circuit 44 ... phase demodulation circuit 46 ... noise removal circuit 50 ... microcomputer 54 ... input / output unit 55 ... CPU 56 ... RAM
57 ... ROM 60 ... determination device 70 ... accessory ECU 90 ... liquid crystal circuit 100 ... signal transmission unit 120 ... sheet sensor 130 ... touch sensor 140 ... signal reception unit 150 ... operator determination unit 160 ... driver 200 ... driver 210 ... riding 501 ... correlation value calculation unit 502 ... operator determination unit 503 ... attenuation amount acquisition unit 504 ... noise determination unit 505 ... noise learning unit

Claims (8)

A determination method for determining an operator who has performed an operation input received by an operation unit operated by an occupant,
A modulation signal generation step of generating a modulation signal obtained by modulating a carrier wave transmitted to the occupant by phase modulation using an information signal representing the occupant and spread modulation using a predetermined spreading code;
The modulation signal transmitted from the occupant to the operation unit when the operation unit accepts the operation input of the occupant is used for phase demodulation and spread modulation corresponding to the phase modulation performed in the modulation signal generation step. A demodulated signal acquisition step of acquiring a demodulated signal demodulated by despreading using the spreading code;
A calculation step of calculating a correlation value between the demodulated signal acquired in the demodulated signal acquisition step and the information signal representing the occupant;
And a determination step of determining an operator from the correlation value calculated in the calculation step. The modulation signal generation step performs spread modulation using a different spreading code for each occupant, and generates a modulation signal that is transmitted simultaneously to the occupant;
The demodulated signal acquisition step acquires the demodulated signal for each of the occupants by despreading the modulated signal transmitted from one of the occupants to the operation unit using a different spreading code for each occupant,
The calculation step calculates a correlation value of each occupant from a demodulated signal for each occupant and an information signal representing the occupant,
The determination method according to claim 1, wherein the determination step determines whether or not the occupant is an operator from a correlation value of each of the occupants. The modulation signal is determined by a correlation value between the information signal used for the phase modulation in the modulation signal generation step and the demodulation signal acquired by demodulating the modulation signal transmitted to the operation unit in the demodulation signal acquisition step. A noise determination step of determining a magnitude of noise included in the modulation signal between the time when it is transmitted to the passenger and the time when it is transmitted to the operation unit;
2. The modulation signal generation step changes at least one or more of a code length of the spreading code and an amplitude of the modulation signal based on the magnitude of noise determined in the noise determination step. Or the determination method of 2. An attenuation amount acquisition step of acquiring an amplitude of the modulation signal that is attenuated when the modulation signal generated in the modulation signal generation step passes through the occupant;
The modulation signal generation step changes the amplitude of the modulation signal generated by the modulation signal generation step based on the amplitude of the modulation signal to be attenuated acquired in the attenuation amount acquisition step. The determination method according to claim 1, wherein:   The demodulated signal acquisition step acquires noise generated from a predetermined device that generates noise, and cancels noise that has entered the modulated signal from the predetermined device using the acquired noise. Item 5. The determination method according to any one of Items 1 to 4. A noise learning step of learning a noise signal that enters the modulation signal with a period based on an autocorrelation value of the signal acquired from the operation unit to which the modulation signal is not transmitted and the period;
The demodulated signal acquisition step acquires a signal obtained by removing the noise signal from the modulation signal transmitted to the operation unit using the noise signal learned in the noise learning step and the period. The determination method according to any one of claims 1 to 5. A determination device for determining an operator who has performed an operation input received by an operation unit operated by an occupant,
A modulation signal generation unit that generates a modulation signal obtained by modulating a carrier wave transmitted to the occupant by phase modulation using an information signal representing the occupant and spread modulation using a predetermined spreading code;
The modulation signal transmitted from the occupant to the operation unit when the operation unit accepts the operation input of the occupant is used for phase demodulation and spread modulation corresponding to the phase modulation performed by the modulation signal generation unit. A demodulated signal acquisition unit for acquiring a demodulated signal demodulated by despreading using the spreading code;
A calculation unit for calculating a correlation value between the demodulated signal acquired by the demodulated signal acquisition unit and the information signal representing the occupant;
And a determination unit that determines an operator from the correlation value calculated by the calculation unit. A determination system including a determination device that determines an operator who has performed an operation input received by an operation unit operated by an occupant,
A transmitter for transmitting to the occupant a modulated signal obtained by modulating a carrier wave transmitted to the occupant by the determination device;
A receiver that receives the modulated signal by the operation unit receiving an operation input of the occupant;
The determination device includes a modulation signal generation unit that generates a modulation signal obtained by modulating a carrier wave transmitted to an occupant by phase modulation using an information signal representing the occupant and spread modulation using a predetermined spreading code;
The occupant signal received by the receiver is demodulated by phase demodulation corresponding to the phase modulation performed by the modulation signal generation unit and despreading using the spreading code used for the spread modulation to obtain a demodulated signal A demodulated signal acquisition unit;
A calculation unit for calculating a correlation value between the demodulated signal acquired by the demodulated signal acquisition unit and an information signal representing the occupant;
And a determination unit that determines an operator from the correlation value calculated by the previous calculation unit.

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