JPH0621905A - FM information signal receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a high-performance FM multiplex information signal receiver. A receiving circuit 101 for separating a multiple information signal from an FM broadcast, a receiving information number storage circuit 103, a signal processing circuit 102 for comparing the information numbers of the received signals and notifying a control circuit 106 of a match, and a storage circuit for storing information. 109, a reception frequency setting circuit 111 that sets the reception frequency under the control of the control circuit 106, and a timing setting circuit 112 that processes the reception timing.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of constructing an FM information signal receiver.

[0002]

2. Description of the Related Art In recent years, the demand for effective use of existing radio waves has increased due to the significant expansion of the market for communication radio wave utilization equipment.
Information multiplexing of various information to existing radio waves is being actively studied. The technological progress in this field has been remarkably put into practical use such as character multiplex broadcasting for multiplexing on TV signals. Conventionally,
In the FM broadcast wave band, which has been used as a broadcast wave for high-quality music, multiplex broadcasting has been studied and partially put into practical use. However, since a mobile terminal which receives this multiplex signal has not been realized yet, the multiplex signal of FM broadcasting is not used at all.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention provides a portable high performance FM information signal receiver,
The purpose is to make multiple broadcasts of M broadcast waves into a practical information medium.

[0004]

The FM information signal receiver of the present invention comprises a signal receiving means for separating an information signal from an FM broadcast wave in which information is multiplexed, a preset reception information number and a received information signal. Comparing means, information receiving means for receiving information following the received information number when they match, storage means for storing the received information, notification means for notifying the user of the received information, and storage for the received information number A reception frequency selection means for controlling the reception frequency of the signal reception means under the control of the control means, and a reception timing control for changing the signal reception timing of the signal reception means according to an instruction from the control circuit. It is characterized by having means.

[0005]

The details of the present invention will be described below with reference to Examples.

The portable FM multiplex information receiving terminal of FIG. 1 according to the present invention is one of many receivers in the FM multiplex information broadcasting system shown in FIG. This receiver receives a lot of information obtained by FM multiplex information broadcasting from the I corresponding to the receiver.
The contents received corresponding to the D number can be selectively displayed and stored, and according to the field of information contained in the multiplex signal in the FM wave transmitted from the FM broadcasting station as shown in FIG. The received code is received and displayed or stored by comparing the added code with the ID number built in the receiver or the selection content set from the outside.

This receiver can incorporate an electronic clock capable of accurately adjusting the time by receiving the time information contained in a part of the FM multiplex signal.

Further, this receiver can check the input level of the FM multiplex signal and display whether or not it is in a receivable state. This receiver includes a display element such as a liquid crystal panel for displaying received information, a display illumination member, a built-in antenna or a storable antenna, a receiving circuit, an ID-ROM, a signal processing circuit, a CPU, a RAM for storing information, a power supply. Circuit, circuit part where these circuit members are mounted, power supply, power switch,
It is composed of a speaker, a buzzer, an LED that warns that a signal has been received, a buzzer, and an operation switch.

In this embodiment, a transparent switch panel is arranged on the upper surface side of the display element and used as a data input or operation switch. FIG. 2 shows an example of a display of a portable FM multiplex information receiving terminal. Part of the display consists of an indicator display showing the reception status, selection of presence / absence of warning sound and alarm sound by buzzer, time display, battery voltage confirmation display, memory retention status display, etc. In the present embodiment, the display unit is composed of a display unit and a dot matrix or active matrix display that mainly displays characters, numbers, pictures, etc. by receiving FM multiplex information broadcast, and is composed of a display unit located in the lower stage. All may be displayed by dot matrix display, active matrix display, or the like, or each portion may be formed by a separate display element. When the power switch is turned on at the time of use, the above-mentioned display element is turned on at the same time when the receiving circuit operates, and the time, the setting status of each function, the contents of FM multiplex information broadcasting reception, etc. are displayed.

The received information is stored in RAM. Information is selectively displayed by operating switches or a transparent switch panel. Next, one structural example of the present invention will be described with reference to FIG. 1
0 is a case, 11 is a transparent switch panel, 12 is a display element, 13 is an illumination member of the display element, 14 is an antenna, 1
Reference numeral 5 is a circuit portion, 16 is a power source, and a switch panel and a display element are connected to the circuit portion by a flexible electrical communication connector. The antenna is directly or indirectly conductively fixed to the circuit unit. The loop antenna is arranged outside the display element and the main circuit so that the opening area is as large as possible. In addition to such a built-in antenna, a rod antenna as shown in FIG. 14 can be used together. As a power source, a dry battery, a primary battery such as a lithium battery or an air battery, or a secondary battery such as a nickel-cadmium battery is used. Further, a small secondary battery for retaining stored contents, clock timing function, and the like may be used together when these batteries are replaced or charged.

FIG. 5 is a block diagram showing the configuration of an FM information signal receiver which is an embodiment of the present invention. The signal input from the antenna 100 is the wireless reception circuit 101.
Is converted into a digital signal by the signal processing circuit 10
Error correction is performed by 2. When the information number in the memory (hereinafter referred to as RMN · M) 103 that stores the received information number and the information number in the received signal are compared in the decoding circuit 102 and a match is detected, an information number match signal is sent to the control circuit 106. Is output. The control circuit 106 starts message reception in response to this signal, processes the message signal from the decoding circuit 102, and stores it in the storage circuit 109. At this time, the control circuit 106 is instructed in advance by the external information device,
The notification method stored in the notification method storage circuit 113 controls the speaker 104, the LED 105, the vibrator 108, and the LCD drive circuit 107 to notify the user of the reception of the message. The instruction from the user is input to the control circuit 106 from the switch input circuit 110. FM
The reception frequency of the broadcast wave is set by the reception frequency setting circuit 111 in the receiving section in the wireless reception circuit 101 according to an instruction from the control circuit 106. Regarding the signal reception timing, the decoding circuit 102 gives the control circuit 106 information regarding the timing such as the reception state of the synchronization signal, and based on this, the control circuit 106 sets the next signal reception timing in the reception timing setting circuit 112.

FIG. 6 is a block diagram of the configuration of an FM information signal receiver which is an embodiment of the present invention. Decoding circuit 102,
Reception frequency setting circuit 111, reception timing setting circuit 1
12 is configured in the G / A 121. Control circuit 106,
The switch input circuit 110, the storage circuit 109, and the LCD drive circuit 107 are included in the CPU 122. The CPU 122 has the configuration shown in FIG. The oscillating circuit 130 gives a signal of the reference frequency to the frequency dividing circuit 131, and the signal from the frequency dividing circuit 131 causes the timer 132 to share the clock function, and the program timer / counter 133 generates various timings necessary for the receiving operation. The input port 134 handles the operation of the switch input circuit 110 shown in FIG. 6 and other input signals. The input / output port 135 is used as a circuit for exchanging information with the G / A 121. The LCD driver 136 corresponds to the LCD drive circuit 107 in FIG.

The power control 137 creates various power supplies required for the CPU 122 from the battery voltage, and at the same time,
It has a function of monitoring the battery voltage and notifying the decrease of the battery voltage. The RAM 138 has the functions of the storage circuit 109 and the notification method storage circuit 113 of FIG. These CPU12
The circuit in 2 stores the program stored in the ROM 139 as C
It is controlled by the execution of the PU-CORE 140. Upon receiving the signal, the CPU 122 outputs an operation start signal for the receiving circuit 101, and the G / A 121 receives the signal and supplies power to the receiving circuit 101 to start receiving the FM signal. The reception frequency at this time is the frequency set by the reception frequency setting circuit 111 in the G / A 121 in the receiving section in the wireless reception circuit 101 under the control of the CPU 122. When the reception is attempted n times under the control of the CPU 122 and the FM multiplex signal is not detected, the CPU 122
Sets the next frequency in the reception frequency setting circuit 111.
In this way, if all frequencies are checked n times and no FM multiplex station is found, the CPU 122 checks one frequency at regular intervals (for example, every 1 minute) to search for FM multiplex service stations. . In this state, the power consumption by the operation of the receiving circuit 101 is suppressed, but even if the user enters the receivable area, it may take a long time to search for the service signal in that area. Therefore, the reception state can be displayed on the LCD by the LCD drive circuit 107, and the user's operation can be input from the switch input circuit 110 to shift to the control for inspecting all frequencies at high speed.

When the FM multiplex broadcasting service station is detected, the CPU 122 checks whether or not a predetermined synchronization signal is sent. Even if this synchronization signal inspection is repeated n1 times, if the synchronization signal is not obtained, it is determined that the service signal is another service signal, and the inspection is returned to another frequency. The detection of the sync signal enables reception of the subsequent information frame number.
The CPU 122 calculates the timing at which the control frame is sent from this information frame number, and sets the next signal reception timing in the reception timing setting circuit 112. The CPU only manages the frame number, and the reception timing setting circuit 112 processes the portion that requires high-speed processing. By receiving the control frame, the FM
Information about multiplex programs is obtained. CPU122
Is the program information number and RMN. If the information numbers in M103 are compared and they match, the necessary information can be received from the information frame sent later. The CPU 122 obtains time information and frequency information of the same multiplex broadcast from the control frame and stores it in the storage circuit 109. If reception at the frequency currently being received becomes impossible, reception at the frequency indicated by this frequency information is tried. RMN. If the information numbers in M103 do not match, the process returns to reception of another frequency. When the requested information is obtained from the information frame, the CPU 122 notifies the user of it as in the embodiment of FIG. It is also possible to receive FM broadcasts of other frequencies based on this information.

Since the information frame includes the information change schedule information, the CPU 122 determines the next reception time based on this information. The change schedule information of this information varies depending on the service station, and the information such as news is changed in a unit of several minutes in an urgent station, and the weather forecast and the schedule of the day are changed in a unit of several hours. By using this information, the CPU 122 can reduce the receiving operation of the station whose information is not changed as much as possible, and reduce power consumption. The frequency information of the information number coincident station is stored in the storage circuit 109 together with the information from the control frame, and reception check of new information is performed at regular time intervals. Also, in order to receive FM multiplex broadcasting with the same information number on another frequency by another service station, CP
The U122 periodically checks all the reception frequencies, and if there is a station with the same information number, the information is also stored in the storage circuit 1.
It is stored in 09. At this time, the inspection time is shortened by not inspecting the frequency of the service station currently being received. This frequency inspection can be performed any time the user thinks it is necessary, the user's switch operation is input from the switch input circuit 110, and the CPU 122 can shift to control for inspecting all frequencies at high speed. Also CPU
122 can store the frequency information of the service station in the storage circuit 109 together with the time information. As a result, a user who moves in the same area every day can automatically store and use the optimum reception frequency for each area together with the change of time, and thus it is possible to reduce the operation of searching for the reception frequency.

For example, when a user operates a switch when getting on a train, the stored frequency of f1 is preferentially checked for reception. If reception is possible here, the reception inspection of the frequency f2 is performed after m1 minutes according to the information in the storage circuit 109. In this way, the optimum FM multiplex broadcast can be received. Since other frequencies are regularly inspected even during this automatic reception, it is possible to receive the radio waves temporarily broadcast by news service stations and the like.

FIG. 8A shows an FM which is an embodiment of the present invention.
It is a block diagram of a structure of an information signal receiver. A CPU 1 including the functions of the CPU 122 and the G / A 121 in FIG.
By using 50, the FM multiplex signal receiving device was downsized. The structure of the CPU 150 is shown in FIG. G
The / A151 realizes the function of the G / A 121 in FIG. G / A151 is CPU-CORE140
Since it can be controlled directly from, the processing can be performed at a higher speed than the configuration of FIG.

FIG. 9 is a block diagram showing the configuration of an FM information signal receiver which is an embodiment of the present invention. C
The power source boosted by the power source circuit 160 controlled by the CPU 150 by operating the PU 150 with the battery voltage is used in a part of the receiving circuit and the circuit of the boosted power source system 161. CPU1
The signal from 50 is sent to the control circuit 163 which controls the circuit of the boosting system through the signal voltage conversion circuit 162. The control circuit 163 is the LCD drive circuit 164 or the high-speed storage circuit 1.
By controlling 65, high-speed processing such as kanji display and retrieval of specific information is shared. The power supply circuit 160, under the control of the CPU 150, generates a high voltage only when high-speed processing is required, which is very effective in reducing the power consumption of the FM multiplex signal receiving device, and at the same time, is limited to the time when the FM multiplex information is received. It is possible to enhance the functionality by, for example, quickly searching for related information from the displayed information and displaying it.

G / A 121 and G in the above embodiment
There is no problem even if the function of / A151 is configured by another standard cell method.

FIG. 10A shows the spectral components of the wideband FM broadcast signal. For simplicity, only the upper half of the center frequency FC of this signal is shown. The signal 802 modulated by the sum of the left and right audio signals is about 15 from the center frequency.
It extends into the band up to kHz. Stereo subcarrier signal 804 is transmitted at 19 kHz. The signal 806 modulated by the difference between the left and right audio signals is 23 to 53 kHz.
Extends in the band. The FM broadcast information ends at 53 kHz and the rest of the channel up to 100 kHz is usually free.

In the present invention, the SCA signal 808 is transmitted using the unused spectrum portion between 53 kHz and 100 kHz. (SCA is a Subsidiary Communication
Abbreviation for Authorization), but here means any auxiliary signal in the FM channel. ) SCA signal 8
08 is modulated with data packets sent from the FM station to multiple page receivers. This data packet is 76k
Modulate the SCA subcarrier of Hz and occupy a bandwidth of about 16 kHz around this frequency. Such bandwidth allows a data transmission rate of 16 kilobaud. The maximum multiplexing rate of the data signal is 10% depending on the multiplexing rate of the signal 806.
It changes from (808) to a minimum of 2.5% (807).

FIG. 10B illustrates the change of the multiplexed signal level. Stereo difference signal 806 modulation level is 0 to 4
It varies from 0%, but especially when its level is below 2.5% (810), the multiplex signal level is kept at 2.5%, and from 2.5 to 10% the same multiplex rate as signal 806. Therefore, at 10% or more, it is kept at 10%. Since the receiver used in the present invention is always carried and used, it is necessary to always secure stable reception characteristics especially in a place where fading or multipath exists. Thus, the crosstalk generated between the signal 806 and the signal 808 can be reduced, and the above object can be achieved. Therefore, the performance of the receiver of the present invention can be sufficiently exhibited.

A block diagram of the receiver section 840 used in the present invention is shown in FIG. The received FM signal is transmitted from an antenna 850 (described later) to a mixer 85 via a radio frequency preselection / attenuation circuit 854 and a radio frequency amplification circuit 856.
Supply to 2. The radio frequency preselection / attenuation circuit 854 attenuates the out-of-band signal to some extent, while the amplifier 856 amplifies the received signal to minimize the noise figure of the receiver. Also,
The preselection / attenuation circuit 854 can also operate to resonate the antenna 850. The mixer 852 is an antenna 850.
The FM broadcast signal received by is mixed with a local oscillator signal from a programmable local oscillator 858. Mixer 85
Double balanced type 2 is preferable. Local oscillator 858
Is a digitally synthesized, rapidly changing oscillator controlled by a microprocessor controller 706. The frequency of the programmable oscillator 858 is controlled according to a pre-stored scanning procedure to mix the required FM broadcast signal and the local oscillator signal to generate the first intermediate frequency (IF).

The output from the first mixer 852 including the intermediate frequency is supplied to the intermediate frequency section 860 shown in detail in FIG. The intermediate frequency unit 860 includes a first filter 8 that passes a desired first IF signal and blocks an undesired mixed component.
62 is provided. In the preferred embodiment, the filter 862 is SA
A W (surface acoustic wave) filter is provided, and the output from the filter 852 is supplied to the second mixer 864. Second mixer 86
4 is the signal from the filter 862 and the second local oscillator 86.
Mix with the signal from 6. The second local oscillator 866 generates a constant frequency, which causes the second frequency converted to the lower one.
A receiver intermediate frequency occurs. The output of the second mixer 864 feeds a second filter 868, which attenuates the undesired mixing components and transfers the second IF signal to the intermediate frequency amplifier 870. The second filter 868 can be a standard ceramic filter of the type commonly used in FM receivers.

According to the double conversion system adopted in the present invention, the size of the receiver can be remarkably reduced. When using a single conversion system with intermediate frequencies, the associated filters need to be very large. Multiple poles are required for filtering to achieve the desired passband shape. In contrast, in the dual conversion system of the present invention, most of the desired passband can be achieved with a very small SAW filter 862 (having dimensions of about 1 mm x 2 mm). According to this SAW filter, about 40d
The desired 250 kHz passband is obtained with the out-of-band stop characteristic of B. The second filter 868, the ceramic filter, consists of a small portion and is used merely to further attenuate the out-of-band blocking portion.

In the preferred embodiment, the antenna 850 and the second
All circuits between filters 868 are implemented in a single GaAs integrated circuit. Since GaAs is an electrical and acoustic medium, even the SAW filter 862 can be constructed in this manner. GaAs is preferred because of its extremely low noise characteristics. However, other technologies such as silicon circuits in discrete or integrated form can be used.

The intermediate frequency amplifier 870 receives the second IF signal from the filter 868 and outputs the phase locked loop detection circuit 872.
Amplification is performed to a level suitable for detection according to (FIG. 11A). The detection circuit 872 demodulates the intermediate frequency signal and supplies the wideband composite audio signal to the SCA filter 874, the stereo pilot filter 878 and the difference signal filter 879. A signal level detector 859 is provided in association with the detector circuit 872, which detector provides an output signal indicative of received signal strength to the microprocessor controller 706. The controller monitors this signal and scans for a new channel if the intensity drops below a threshold.

SCA filter 874 forwards the desired SCA channel to SCA decoder 876 while attenuating lower frequency audio components. Difference signal filter 8
79 takes out the amplitude level change of the difference signal and outputs a DC signal corresponding to the level change. SCA decoder 87
Reference numeral 6 receives a DC signal, and corrects the amplitude fluctuation caused by the change of the multiplexing rate of the SCA channel signal. Then, the SCA channel signal is corrected to a signal having a constant amplitude. Decoder 876
Demodulates the filtered SCA channel and provides 16k baud packet data to the packet decode circuit. The composite audio signal from the phase lock loop detection circuit 872 is supplied to the input terminal 970 of the filter 874.

The stereo pilot signal is supplied from the stereo pilot filter 878 to the pilot input terminal 980 of the decoder 876. Each time the leading or rising edge of the stereo pilot signal appears, the filter 874
The sub-carrier including the data signal input from the output terminal of is sampled at each zero-crossing rising edge of the pilot signal. The state of the subcarrier at this moment determines that the received data bit is 0 or 1.

As an alternative embodiment, SCA decoder 876 can be replaced by a phase locked loop decoder (not shown). In such an embodiment, it is necessary to supply a 76 kHz reference signal to the phase locked loop decoder for phase synchronization. A frequency multiplication stage (not shown) is inserted between the pilot filter 878 and the phase-locked loop SCA decoder to extract the 76 kHz signal from the stereo pilot signal.
The signal can be generated directly. In contrast, the conventional digital SCA system noise-modulates the SCA carrier in order to derive the demodulation reference frequency. (Noise modulation is
Required in applications where data may be always on or always off. ) Phase locked loops are used in such systems to synthesize carrier frequencies from random modulations. However, these systems are unsuitable for applications such as this example, which can have low signal-to-noise margin.

Both of the above embodiments of the SCA decoder use 76 kHz with a 19 kHz stereo pilot signal.
Decode the packet data from the Hz subcarrier. This technique provides accurate subcarrier decoding independent of the components within the clock receiver / tuner section 840. Therefore, frequency instability caused by factors such as aging, shock and temperature change is eliminated. The 76 kHz SCA subcarrier modulated with packet data transmitted from the FM station is itself locked to this same 19 kHz pilot signal. Therefore, any inaccuracies in the SCA subcarriers are tracked by the transmitter and receiver as well, ensuring accurate demodulation. Using an unmodulated stereo pilot signal as a reference for receiving data from a modulated sub-carrier increases the received signal strength by 3-4 dB over conventional noise modulated phase locked loop techniques. Therefore, these techniques significantly improve the receiver's small signal performance.

Strict requirements are placed on the antenna system of small portable receivers. For example, it is necessary to keep the number of radio frequency amplification stages in the receiver to a minimum to keep its battery consumption to a minimum. Therefore, it is necessary to supply a strong signal from the antenna to the receiver. However, the signal received by the antenna decreases as the size of the antenna decreases. Due to the small size and portability of portable receivers, their antennas are small and inadequate, and inevitably generate weak signals.

Such a problem becomes significant depending on the operating environment of the small receiver. Many FM broadcast receivers work with grounded transmit antennas. Small receivers, on the other hand, inevitably require the use of antennas located close to the receiving user, so their height is approximately 50-200c.
Limited to m. The signal received by the antenna decreases as the antenna approaches the ground, thus further degrading the signal received by the small receiver antenna.

Irrespective of the antenna geometry chosen, the antenna has reception characteristics such as polarization and directivity patterns which can obscure the operation of the system.

For example, the loop antenna presents an under-signal strength portion on the loop surface. The dipole and vertical antennas exhibit a signal strength off-axis portion outside the conductor axis. If the small receiver antenna momentarily points in a direction such that the desired FM signal is in such a signal strength undershoot, the signal and associated data will be lost. A similar effect occurs when the plane of polarization of the receiving antenna is momentarily oriented in a direction orthogonal to the plane of polarization of the signal being received. It is important that antennas used with small receivers do not have such undesired receiving characteristics, because even the slight loss of signal destroys the original shape of the received data.

In the present invention, the above-mentioned problem is overcome by adopting a structure in which the antenna element of the small portable receiver and the main body of the receiver are effective antennas. When the FM frequency signal is constantly received and awaited during carrying and transportation, a plurality of loop antenna elements with different opening plane directions built into the receiver body can provide almost omnidirectional characteristics, and Non-reception of orthogonally polarized signals is also significantly eliminated. If the receiver is placed in a weak electric field area and it is necessary to use the function of the receiver in that area, pull out the monopole antenna built in the receiver to the outside of the receiver and By forming the built-in substrate of the main body or the main body with metal, the main body has an effect as a part of the antenna, thereby increasing the antenna gain of the receiver and maintaining the function of the receiver.

In the preferred embodiment shown in FIG. 12A,
A loop antenna 75 is provided on two sides of the receiver main body 750 which are orthogonal to each other.
1, 752 are arranged, and the monopole antenna 754 is arranged at one position of the main body 750. A data display section 753 is provided in the center of the main body 750. The display portion 753 is shown in FIG.
In the liquid crystal display 726 shown in FIG. 1A, an FM frequency signal received using an antenna is displayed as data through the circuit in FIG. 11A. Since the loop antennas 751 and 752 are orthogonal to each other, they are orthogonal to each other.
The magnetic field component in the direction can be detected. Although the monopole antenna 754 is housed inside the main body 750 when it is carried, it can be arbitrarily drawn out in a weak electric field area.
The extension 755 of 50 is 1/8 or more of the FM frequency signal wavelength. When the extension 755 has the above length, the antenna 754 and the main body 750 are integrated to form an antenna for detecting an electric field component, and the antenna gain can be dramatically increased.

FIG. 12B illustrates the electric circuit of the antenna of the above embodiment of the present invention. The amplifier 780 is shown in FIG.
This corresponds to the circuit 856 in (A). The terminal 784 is the mixer 8
It is a terminal connected to 52. Loop antenna 751, 7
52 is a capacitor 781 for matching with the amplifier 780,
Connected via 782. The other terminal of the loop antenna is connected to the reference potential 783 of the circuit board. And
The monopole antenna 754 is a loop antenna 751, 7
It is arranged with respect to the reference potential 783 so as to face 52. By arranging in this way, the loop antenna 751,
Like the monopole antenna 754, 752 can also function as an electric field antenna. When the receiver is in a strong electric field area of FM broadcast radio waves, the monopole antenna 754 is housed in the receiver and used only by the loop antennas 751 and 752. When it is in a weak electric field area, the monopole antenna 754 is used. Can be achieved in this way to improve the reception characteristics.

FIG. 13 illustrates the operation of the loop antenna in the embodiment of the present invention. The loop antenna is composed of 751 and 752 portions and has a structure orthogonal to each other. Then, it is sensitive to both magnetic field components 787 and 788 which are orthogonal to each other. With this structure, good reception characteristics can be maintained for two orthogonal postures.

The embodiment shown in FIG. 14 is an example in which the main body 750 is used vertically. The extension 755 of the monopole antenna 754 and the main body 750 is further lengthened, and the antenna gain can be further increased. A common monopole antenna 754 is used in FIG. 12A and this figure. This can be realized by making the connecting portion of the antenna 754 with the main body freely bendable.

When the monopole antenna is extended to the maximum, the base 789 of the antenna appears on the surface of the main body 750 as shown in the figure, and when extended as it is, it becomes an antenna 754a. When the antenna is bent around the fulcrum 790, it becomes an antenna 854b.

As a result, the extension angle of the monopole antenna 754 can be changed, and the degree of freedom in receiving characteristics can be increased.

The embodiment shown in FIG. 15 shows a type of a single loop antenna which utilizes the main body 750 among the antennas which are pulled out from the main body 750. The main body insertion portions 761a and 761b of the antenna, the crossing portion 762 connecting them to each other, and the main body 750 form a loop shape. Of course, the loop antenna 7 shown in FIG.
51 and 752 are also incorporated in this example, and the directions of these three opening surfaces are orthogonal to each other. As a result, no matter what direction the FM frequency signal arrives, non-reception is improved regardless of the polarization direction. Of course, 761a, 76
When the antenna using 1b and 762 is not used, it can be stored in the main body 750.

The embodiment shown in FIG. 16 is an example in which an antenna is formed on a circuit board inside the main body 750. The circuit board 772 included in the main body 750 is a board on which the element 773 and the display portion 753 are mounted.
70 and 771 are provided. These have characteristics as slot antennas. That is, the magnetic field component along the longitudinal direction of the cut can be detected. Further, since the antenna can be formed on the circuit board, there is an advantage that structural parts used for the antenna are not required.

[0045]

As described above, according to the present invention, it is possible to provide a small-sized and high-performance FM multiplex signal receiving device with low power consumption, so that it is possible to effectively use information multiplexed in FM broadcasting. , Its effect is very large.

[Brief description of drawings]

FIG. 1 is an external view of an embodiment of the present invention.

FIG. 2 is an external view of a display example according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an FM broadcasting system.

FIG. 4 is a diagram showing a structure of an embodiment of the present invention.

FIG. 5 is a block diagram of an embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 7 is a block diagram of a CPU according to an embodiment of the present invention.

FIG. 8A is a circuit configuration diagram of an embodiment of the present invention,
FIG. 3B is a block diagram of a CPU according to an embodiment of the present invention.

FIG. 9 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 10A is a diagram showing a spectrum component of a wideband FM broadcast signal, and FIG. 10B is a diagram explaining a change in a multiplexed signal level.

FIG. 11A is a block diagram of a receiver section of the present invention,
(B) is a block diagram of an intermediate frequency circuit unit.

FIG. 12A is a diagram illustrating a structure of an antenna unit of a receiver of the present invention, and FIG. 12B is a diagram illustrating an electric circuit of an antenna unit of the receiver of the present invention.

FIG. 13 is a diagram for explaining the operation of the loop antenna used in the receiver of the present invention.

FIG. 14 is a diagram showing another use state of the receiver of the present invention.

FIG. 15 is a diagram showing an embodiment of another antenna used in the receiver of the present invention.

FIG. 16 is a diagram showing an embodiment of another antenna used in the receiver of the present invention.

[Explanation of symbols]

10 Case 11 Switch Panel 12 Display Element 13 Illumination Member 14 Antenna 15 Circuit Section 16 Power Supply 100 Antenna 101 Reception Circuit 102 Signal Processing Circuit 103 Reception Information Number Storage Circuit 104 Speaker 105 LED 106 Control Circuit 107 Liquid Crystal Driving Circuit 108 Vibrator 109 Storage Circuit 700 Protocol decoder 701 Flag detector / remover 702 Zero bit remover 703 Frame check sequence calculator 704 Error check corrector 705 Address detector 706 Microprocessor controller 708 Random access memory 720 Programmable clock timer 722 Power controller 724 Segment driver 726 Liquid crystal display 729 Audible signal generator 730 Read-only memory 740 Peripheral device 750 Receiver main body 751, 752 Loop antenna 753 Data display panel 754, 754a, 754b Monopole antenna 755 Antenna length 761a, 761b Loop antenna element (insertion section) 762 Loop antenna element (transverse section) 770, 771 Slot antenna 772 circuit Substrate 773 Circuit element 780 RF amplifier 781,782 Capacitor 783 Common potential (ground) 784 Terminals 787,788 Magnetic field component 789 Base 790 Support point 802 Stereo sum signal 804 Stereo pilot signal 806 Stereo difference signal 807 Multiplex signal (2.5%) 808 Multiplexed signal (10%) 810, 811, 812 Level change 840 Receiver section 850 Antenna 852 Double balanced mixer 854 RF selection / attenuation circuit 856 RF amplifier 858 Programmable oscillator 859 Signal level detector 860 Intermediate frequency unit 862 First filter 864 Second mixer 866 Constant frequency oscillator 868 Second filter 870 Intermediate frequency amplifier 872 Phase lock loop detection circuit 874 SCA filter 876 SCA decoder 878 Stereo pilot filter 879 Difference signal Filter 980 Pilot input terminal

Claims (12)

[Claims] 1. A signal receiving means for separating an information signal from an FM broadcast wave in which information is multiplexed, an information selecting means for comparing a received information signal with a preset received information number, and the received information number when they match. Of the control means, which has at least an information receiving means for receiving the information that follows, a storage means for storing the received information, a notifying means for notifying the user of the received information, and a reception information number storage means for storing the reception information number. An FM information signal receiver comprising: a reception frequency selection means for controlling the reception frequency of the signal reception means by control; and a reception timing control means for changing the signal reception timing of the signal reception means according to an instruction from a control circuit. 2. The FM information signal receiver according to claim 1, wherein the SCA decoder included in the signal receiving means comprises a correction circuit for keeping the SCA channel signal amplitude constant. 3. The FM information signal receiver according to claim 1, wherein the SCA decoder has means for detecting a signal amplitude from a stereo difference signal filter. 4. The antenna included in the signal receiving means,
The FM information signal receiver according to claim 1, wherein the FM information signal receiver comprises a loop antenna element having openings in two orthogonal directions at the same time. 5. An antenna included in the signal receiving means,
The total length at maximum extension is 1/1 with respect to the received frequency signal wavelength
The FM information signal receiver according to claim 1, wherein the FM information signal receiver is a pole antenna having a length of 0 wavelength or more. 6. The antenna included in the signal receiving means,
2. The FM information signal receiver according to claim 1, wherein the FM information signal receiver comprises a slot antenna element having simultaneously two cutouts in two directions orthogonal to each other on a built-in circuit board of the receiver. 7. The FM information signal reception according to claim 1, wherein the antenna according to claim 4 and the antenna according to claim 5 are connected to the same high frequency amplifier circuit included in the signal receiving means. Machine. 8. The FM information signal reception according to claim 1, wherein the antenna according to claim 5 and the antenna according to claim 6 are connected to the same high frequency amplifier circuit included in the signal receiving means. Machine. 9. A matching circuit for connecting both antennas according to claim 7 and a high-frequency amplifier circuit to each other, wherein the matching conditions of both antennas are both set to optimum conditions. The described FM information signal receiver. 10. The antenna according to claim 5, wherein the antenna is refractable, and the sum of the total length at the maximum extension from the refraction portion and the length of one side of the built-in circuit board is 1 with respect to the reception frequency signal wavelength.
The FM information signal receiver according to claim 1, wherein the FM information signal receiver has a length of / 10 wavelength or more. 11. The FM information according to claim 1, further comprising a loop antenna element having an opening in one direction orthogonal to two openings in two orthogonal directions secured by the antenna according to claim 4. Signal receiver. 12. The FM information signal receiver according to claim 1, wherein the loop antenna element according to claim 11 has a perimeter of 1/10 wavelength or more of a reception frequency wavelength.