KR101606546B1 - Remote sound tuning system and method using a wireless microphone - Google Patents

Abstract

The present invention relates to a remote sound tuning system using a wireless microphone and a method thereof. More particularly, the present invention relates to a remote sound tuning system using a wireless microphone, in which a sound absorbing unit in which voltage- A wireless microphone transmitter for receiving and outputting electromagnetic waves; And a demodulator for demodulating the electromagnetic wave output from the wireless microphone transmitter and demodulating the electromagnetic wave output from the wireless microphone transmitter into a tuning sound source and outputting a frequency-dependent voltage of the tuning sound source generated through an internal DSP (Digital Signal Processor) A wireless microphone receiver for analyzing an error of a frequency-dependent voltage of a sound source and transmitting analyzed frequency-dependent voltage error information to a server through a network; A server for storing voltage-to-voltage error information of each frequency transmitted from the wireless microphone receiver and transmitting the voltage error information according to the request of the tuner; A graphical user interface (GUI) for displaying frequency-dependent voltage error information transmitted through the network from the receiver in a graph capable of being interpreted by a tuner; A voltage-dependent voltage error analyzed by the tuner through the graphical user interface
The present invention provides a network control for modifying acoustic frequency characteristics of a sound system to be tuned on the basis of information and provides various operating states and controllable variables to the graphical user interface, And a coordination target acoustic system having a management system.
Therefore, it is possible to efficiently operate the acoustic system tuner, which is a limited human resource, and cope with the emergency situation of the acoustic system such as the performance in real time.

Description

TECHNICAL FIELD [0001] The present invention relates to a remote sound tuning system and method using a wireless microphone,

The present invention relates to a remote sound tuning system and a method thereof using a wireless microphone, and more particularly, to a remote sound tuning system using a wireless microphone and a multi-stage digital acoustic filter for compensating a sound absorption unit characteristic, a frequency changeable sinewave or pink noise oscillator for measuring acoustic frequency response characteristics and a network for remote control of the network, A wireless microphone set having a communication unit is used as a tuning microcomputer and a digital sound controllable by a remote control based on a frequency response characteristic of the tuning target sound system measured using the wireless microphone set Digital audio signal processor and remotely controllable The present invention relates to a remote sound tuning system and a method thereof, which can provide a management service such as checking or tuning a user's sound system at a remote place through a digital power amplifier.

Generally, an acoustic system refers to a sound source such as a sound source reproducer capable of reproducing a sound source or a microphone for collecting a sound field and converting the sound into an electric signal, and an audio mixer (audio a speaker management system for pre-tuning the final output sound source from the audio mixer according to characteristics of the speaker and the amplifier, an amplifier for amplifying the output of the speaker management system, And a speaker for switching to an audio signal.

At this time, the configuration of the system may be reduced or enlarged according to the quality of the sound desired by the user.

According to the complexity of the acoustic system, the tuning of the acoustic system can be performed in various forms, for example, in the case of installing the speaker, which is considered to be the most important, the space between the stage and the audience, Considering the many variables such as the structure of the audience, height, etc., the position, height and installation method of the speaker are determined.

Changing the speaker and other equipment once it has been determined once again requires considerable manpower and equipment, so it uses various effectors based on the installed condition to fix the problems unless it is a fatal problem.
In this case, most of the effectors to be used are built in the speaker management system. Here, the speaker management system is a system for amplifying the output of a sound source device or an audio mixer through a power amplifier and converting the amplified output to sound through a speaker The frequency distortion caused by the mechanical structure of the inner coil of the speaker and the resonance structure of the speaker bar are introduced and the physical distances between the audiences from the speakers and the propagation characteristics Is a line correcting device for preventing distortion of the sound actually heard by the audience or giving a desired sound field effect.
In addition, in the case of a professional speaker in which the reproducible range of the speaker is divided, a crossover filter for filtering only the reproducible band of the corresponding speaker is necessarily built in.
Most of them are composed of separate equipment, and they are sometimes integrated into the input section of the power amplifier.
Such a speaker management system is generally used between an audio mixer and a power amplifier, and internally includes an equalizer, a delay, a crossover filter, a compressor, a limiter, an audio mixer, and a volume controller.

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On the other hand, an effect device is incorporated in the audio mixer. However, the effect device of the audio mixer is used for real-time sound effects such as real performance and recording, and is mostly operated by the user.

Therefore, the effector for sound tuning during installation is usually built in the speaker management system and is mainly used.

Among the various characteristics for the acoustic tuning, the frequency response and the response time are the most directly influential characteristics to the listener.

In this case, when the response time is set to several loudspeakers and the distances between the loudspeakers are different from one point on the audience, a time difference may occur in the sound heard at one point in the audience. This is caused by a delay delay effect on the speaker management system It is possible to calibrate by using. In other words, it is a calibration method that inserting a delay effect to a sound source which is sent to a nearby speaker from the audience so that a listener of the audience does not feel the time difference.

It can be measured to some extent with the human ear, without the need for special measuring equipment, and the completion of the calibration can be measured.

As a basic knowledge required before describing the frequency response, considering the types of speakers classified according to the reproducible frequency band, there is a super tweeter (super tweeter) capable of reproducing in the 7 kHz to 20 kHz band, a band of 3 kHz to 6.9 kHz A tweeter, a squawker capable of reproducing a band of 500 kHz to 2.9 kHz, a mid woofer capable of reproducing a band of 300 kHz to 499 kHz, a woofer capable of reproducing a band of 100 kHz to 299 kHz, And a subwoofer capable of reproducing a band of 20 kHz to 99 kHz. In general, a speaker for indoor music listening is a speaker for a 2-way speaker and a full-range speaker for a tweeter and a woofer, For a 3-way speaker, a full-range speaker is configured as a tweeter, a scoker and a woofer. In case of a 4-way speaker, a separate subwoofer speaker is added for bass reinforcement.

In order to reproduce each band, a separate power amplifier is required. Therefore, due to problems such as cost due to the number of power amplifiers and a problem of space allocation, in the case of a large theater, a stacked ) Flying is often used to install two-way full-range speakers that can be installed and a subwoofer attached to the structure to hang it.

In this case, the sound source should be amplified by a power amplifier divided into a sound source for a 2-way full-range speaker and a sound source for a sub-woofer. A filter that divides one sound source into the frequency bands of the speakers is called a crossover filter.

These crossover filters are also included in the speaker management system, and you can set various control parameters for detailed filter settings. In addition to the crossover filter, the speaker management system includes the above-described forced delay, an equalizer for amplifying or attenuating a certain frequency band, a limiter for preventing a sudden occurrence of a loud sound, and an effector such as a compressor. The installer of the sound equipment tunes the sound by adjusting the speaker management system so that the listener can hear the sound that is the same or better than the original sound in the audience.

As described above, the response time can be adjusted as a human ear, but in the case of the frequency response characteristic, it is impossible to fine-tune only by listening through the ear, so measurement equipment is required.
Here, the term "frequency-response characteristic" refers to the frequency dependence of the gain and out-of-phase of the output when a sinusoidal wave is input, (Ie, measuring what response an input signal with a constant amplitude of a certain frequency enters when entering a certain system), and between the sinusoidal input in the linear system and the sinusoidal output in steady state thereby And the difference between the gain and the phase depending on the frequency of the signal.

At this time, the measuring instrument includes a measuring microphone with a frequency response characteristic that is made very uniformly in the entire audio frequency band and a tone generator oscillator for tuning such as sine wave, white noise and pink noise, It consists of analyzable instruments or software for sound measurement.

The measurement method is as follows. First of all, the most general position of the audiences among audiences is selected for the first tuned acoustic system, a measurement microphone is installed at the position, the output of the microphone is connected to the input of the measuring instrument, Is input to the sound system as a sound source, and then the frequency response over the entire frequency band is measured.

In addition, the process of analyzing the measured frequency response and coordinating with the sound of a better form to be heard by the human being is not limited to the specific target value, but rather the spatial structure of each site, the special request of the user, , And is correlated with the personal abilities of the tuning engineer.

In other words, even if there is a special education about sound coordination, or a general person who does not have experience, it is very time-consuming to analyze the frequency response and make a better acoustic state, do.

Therefore, if the sound system tuned by the professional tuner at the time of initial installation is changed due to internal or external factors such as user's carelessness, malfunction of equipment, etc., the professional tuner will have to visit and coordinate again to correct it It occurs very frequently.

Korean Registered Patent No. 10-1521368 (May 12, 2015) Korean Patent Publication No. 10-2014-0082756 (Jul. 02, 2014)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a remote sound tuning and management system using a wireless microphone System and method therefor.

In order to achieve the above object, several problems must be solved in order for a professional tuner to check and tune an acoustic system at a remote site.

The first task is to have the tuner mic and instrument necessary for tuning in the field, but if the tuner microphone and instrument can not be purchased by the user and should be sent to the site on every inspection, Since the same level of cost as the site visit is consumed, it should be possible to use the equipments installed on site and use it for tuning.

The second task is to receive the measurement results of the tuning microphone and the instrument remotely and express it in a form that can be interpreted by the tuner.

The third challenge is that the tuner should be able to remotely control the acoustic characteristics of the acoustics system.

In order to solve the first problem described above, various means can be suggested.

When tuning microphones and general dynamic microphones used by users are used, low frequency low frequency and high frequency high frequency response, which are commonly used microphone characteristics, are obtained.

Of course, this result is relatively inferior to the standard value of the corresponding dynamic microphone frequency response. However, it is almost impossible for the tuner to obtain the standard value of the frequency response of many types of dynamic microphones at the remote site.

In addition, a meter for obtaining a frequency response of a dynamic microphone is separately required. This is a problem that is applicable to various types of wired microphones such as a condenser microphone, a micro electromechanical system (MEMS) microphone, and the like.

In order to accomplish the above object, a remote sound tuning and management system using a wireless microphone according to the present invention includes a sound absorbing unit in which voltage error information of sound pressure frequency versus sound pressure frequency is pre- A wireless microphone transmitter for receiving a sound source and converting it into an electromagnetic wave and outputting the electromagnetic wave; And a demodulator for demodulating the electromagnetic wave output from the wireless microphone transmitter and demodulating the electromagnetic wave output from the wireless microphone transmitter into a tuning sound source and outputting a frequency-dependent voltage of the tuning sound source generated through an internal DSP (Digital Signal Processor) A wireless microphone receiver for analyzing an error of a frequency-dependent voltage of a sound source and transmitting analyzed frequency-dependent voltage error information to a server through a network; A server for storing voltage-to-voltage error information of each frequency transmitted from the wireless microphone receiver and transmitting the voltage error information according to the request of the tuner; A graphical user interface (GUI) for displaying the frequency error information of each frequency transmitted through the network from the receiver in a graph interpretable by the tuner; The present invention provides network control for modifying the acoustic frequency characteristics of the sound system to be tuned based on frequency-dependent voltage error information analyzed by the tuner through the graphic user interface, and also provides various operation states and controllable variables to the graphical user interface And a speaker management system that is interlocked with the control of the graphic user interface.

In this case, the wireless microphone transmitter is a general digital or analog wireless microphone transmitter using a sound-absorbing unit having a very high sound-absorbing sensitivity, and the voltage-to-sound-voltage error information of each sound- Wherein a sound absorption unit in which a response is located within a maximum value that can be corrected by a sound absorption unit correction filter implemented in the DSP of the wireless microphone receiver is used.

The wireless microphone receiver may further include an RF receiving and tuning unit for receiving an electromagnetic wave output from the wireless microphone transmitter and selecting a desired channel; A detection and demodulation unit for receiving the RF reception and tuning unit and switching the selected electromagnetic wave frequency band to the tuning sound source under the control of the control unit; An ADC unit for converting the analog sound source signal output from the detection and demodulation unit into digital sound source data; The difference between the voltage error characteristic of the sound-absorbing unit frequency used in the wireless microphone transmitter and the voltage error characteristic of each microphone frequency for the ideal tuning are stored in the digital sound source data converted by the ADC unit, A DSP (Digital Signal Processor) for applying and correcting the digital filters for analyzing the corrected sounds, and transmitting the analyzed sounds through a network; A DAC unit for converting a digital audio signal input from the DSP into an analog audio signal; An audio output unit for amplifying and balancing the analog audio signal input from the DAC unit to a level desired by the user and outputting the amplified analog audio signal to an audio mixer in the tuning target sound system; (PLL) (not shown) for channel selection in the detection and demodulation unit, controls the operation of the logic module in the DSP unit, and controls the operation of the logic unit A control unit for controlling the DSP unit according to a control command received from the server through the communication unit and displaying the operation status of the current wireless microphone receiver to the user by controlling the display unit; A display unit for displaying a current state of the wireless microphone receiver to the user under the control of the controller; And a network communication unit for transmitting voltage-dependent sound pressure-dependent voltage error information to the server under the control of the control unit or transmitting a control command transmitted from the server to the control unit.

The DSP includes a first digital logic switch for transmitting a digital audio signal input from the ADC unit to a filter unit for correcting a sound absorption unit or bypassing the digital audio signal to a second digital logic switch; A sound absorption unit correcting filter for correcting a digital audio signal input through the first digital logic switch according to frequency-to-frequency sound pressure-dependent information in an audible frequency of a sound-absorbing unit attached to the wireless microphone transmitter; A sound signal output through the sound absorbing unit correction filter or a digital audio signal directly inputted through the first digital logic switch is transmitted to a limiter. Or adjusts the volume of the digital audio signal to a specified volume or less; A digital FFT (Fast Fourier Transform) module or a variable frequency band pass filter (VBPF) in a digital sound frequency analyzer and a detector module for transmitting the digital audio signal to a detector module 3 digital logic switch; An FFT module for calculating a voltage error for each frequency of a digital audio signal input according to a Fast Fourier Transform equation when a digital audio signal is input through the third digital logic switch and transmitting the result to a tuner through a control unit and a network communication unit; A digital acoustic frequency analyzer comprising a VBPF and a detector for detecting and filtering a variable frequency region included in the digital audio signal when the digital audio signal is input through the third digital logic switch; A tuning sound generator including a Pink Noise Generator for generating a noise level required for tuning at the same level in the entire band or a sine wave oscillator for generating a sine wave having a predetermined frequency; A pink noise signal output from the pink noise generator or a sine wave signal output from a sine wave oscillator or a digital audio signal bypassed from the third digital logic switch among components of the tuning sound source generator is transmitted to a resistor A fourth digital logic switch; And a resistor for limiting a level of a pink noise signal, a sine wave signal, or a digital audio signal transmitted through the fourth digital logic switch to the DAC unit.

Further, the sound absorbing unit correction filter is characterized in that a plurality of second IIR (Infinite Impulse Response) filters are connected in series.

The sound absorbing unit correction filter may include a band filter for raising or lowering a band of a specific frequency and a plurality of unit filters which can be used as a filter for raising or lowering a band of frequencies above or below a specific frequency as a whole .

The control parameter of the sound absorbing unit correction filter is previously calculated and stored so that the characteristics of the sound absorbing unit can be corrected in the same manner as the ideal tuning microphone in accordance with the sound pressure unit voltage difference information of the sound absorbing unit of the wireless microphone transmitter. do.

According to another aspect of the present invention, there is provided a remote sound tuning and management method using a wireless microphone including a wireless microphone transmitter, a wireless microphone receiver, a server, a graphical user interface (GUI) provided in a personal computer, A method for remote sound tuning comprising the steps of: determining whether the tuner manipulates a tuning start key; When the tuning start key is turned "on ", the control unit of the wireless microphone receiver sets the movable terminals of the third and fourth digital logic switches provided in the DSP unit to F, FT or VBPF in the digital acoustic frequency analyzer, Switching to a pink noise generator in a generator or a fixed terminal connected to a sine wave oscillator side respectively; Inputting a coefficient calculated according to a control variable for tuning stored in advance in a sound-absorbing unit correction filter; Switching the movable terminals of the first and second digital logic switches to fixed terminals respectively connected to the sound absorption unit correction filter side; If the tuner switches the movable terminal of the third digital logic switch to the fixed terminal connected to the FFT module and the movable terminal of the fourth digital logic switch is switched to the fixed terminal connected to the pink noise generator, To an input of a tuning target acoustic system; Amplifying the pink noise through the tuning target sound system and outputting the amplified pink noise; Continuing to determine whether a digital audio signal is received in the F. F.TM module; If the digital audio signal is received in the F.F.TM module, calculating a voltage error for each frequency of the input digital audio signal according to the Fast Fourier Transform equation and transmitting the result to the server through the network communication unit; When the server storing the frequency response data is transmitted to the request of the personal computer at the request of the tuner, the sound information transmitted from the server is converted into a frequency response curve to be displayed on a GUI provided in the personal computer, Reading out the analyzed frequency-dependent voltage error indicated in the frequency-domain signal; Determining whether the tuning has been completed; Transmitting the control command to the speaker management system according to the frequency response read through the network communication unit and returning to the initial start step when the tuning is not completed; And switching the first to fourth digital logic switches to a bypass mode, which is a normal use mode, when the tuning is completed.

After the step of switching the movable terminals of the first and second digital logic switches to the fixed terminals respectively connected to the sound absorption unit correction filter side, the tuner connects the movable terminal of the third digital logic switch in the DSP to the VBPF and the detector Determining a frequency to be measured as a lowest frequency if the movable terminal of the fourth digital logic switch is switched to a fixed terminal connected to the sine wave oscillator; Matching the V.B.P.F and the detector to the measurement frequency; Starting a measurement of the sinusoidal output and response time of the measured frequency; Continuing to determine whether a digital audio signal is received at V.B.P.F and the detector; Measuring a signal level measurement and response time when a digital audio signal is received at V.B.P.F and the detector; Incrementing the measurement frequency according to the resolution to be measured; Determining whether the incremented frequency is greater than a predetermined maximum frequency and returning to adjusting the V.B.P.F and the detector to the measurement frequency if not greater; If the incremented frequency is greater than the predetermined maximum frequency, when the server storing the frequency response data is transmitted to the request of the personal computer at the request of the tuner, the sound information transmitted from the server is converted into a frequency response curve, And a step of entering into a step of displaying on the GUI and reading the analyzed frequency-dependent voltage error of the tuner displayed on the GUI.

At this time, the response time and the phase-by-frequency measurement of the sound system to be tuned are performed by combining the oscillation time of the pink noise generator or the sine wave oscillator, the reception time of the measured sound source and the delay time of the digital sound system .

Determining whether the user of the wireless microphone wants to change the timbre if the tuning start initial tuning start key is in the "off" state; Switching the first and second digital logic switches to bypass if no tone change is desired; Inputting a control variable for changing a tone color to a sound-absorbing unit correction filter when the tone color is desired to be changed; And switching the movable terminals of the first and second digital logic switches to fixed terminals respectively connected to the sound absorption unit correction filter side and terminating the operation.

As described above, according to the remote sound tuning system and method using the wireless microphone of the present invention, the following effects can be obtained.

The tuning target sound system can be tuned remotely, without having to visit the tuner, which is a limited human resource. In addition, it is possible to store and manage the tuning data for each site, and immediate restoration is possible, so that it is possible to cope with the problems imminently when the performance is imminent.

In addition, since tuning can be performed without a separate tuning microphone or measurement system, the configuration of the tuning system to be provided at a site requiring constant maintenance is simplified, and the system cost is reduced.

In normal use, this function can be applied to the tone control of the wireless microphone and the analysis of the reception sound, so that the component resources added to the wireless microphone can be effectively used.

1 is a schematic block diagram of a remote sound tuning system using a wireless microphone to which the present invention is applied.
FIG. 2 is an internal block diagram of a wireless microphone receiver in a remote sound tuning and management system using the wireless microphone of the present invention. FIG.
3 is a specific block diagram of the digital signal processing apparatus (DSP unit) in FIG.
4 is a graph of the frequency response of an ideal tuning microphone sound-absorbing unit to assist in explaining the present invention.
FIG. 5 is a graph of the frequency response of a sound-absorbing unit of a microphone for a voice generally felt by a human to help explain the present invention. FIG.
6 is a graph showing an example of setting of a filter for micro tuning for tuning a general microphone sound absorbing unit according to the present invention.
7 and 7B are flowcharts for explaining a remote sound tuning method using a wireless microphone in the present invention.

Hereinafter, a remote sound tuning system and a method thereof using a wireless microphone according to the present invention will be described with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a schematic block diagram of a remote sound tuning system using a wireless microphone to which the present invention is applied.

Referring to FIG. 1, the remote sound tuning system using the wireless microphone of the present invention includes a wireless microphone transmitter 100, a wireless microphone receiver 110, a server 130, and a GUI (Graphic User Interface) And a personal computer (PC) 150.

 The sound system 170 to be tuned is generally composed of an audio mixer 171, a speaker management system 172, an amplifier 173, and a speaker 174.

In addition, the sound source device 160 for generating a sound source is excluded from the coordination target because it is modified in real time according to the situation of the site.

In general use, the wireless microphone transmitter 100 is used by a performer and acts as one of the source equipment 160.

Further, as a preparatory work for remote tuning, the wireless microphone transmitter 100 is installed at a position of a seat that serves as a reference point for central adjustment of the seat, and is directed toward a direction in which the speaker 174 is installed.

The user sets the reference point to be tuned in the audience, sets the direction of the wireless microphone transmitter 100, adjusts the volume of the input port of the wireless microphone receiver 110 connected to the audio mixer 171 to a level that is normally used And switches the remaining input ports to silence to prevent measurement errors.

After switching the wireless microphone receiver 110 to the remote tuning mode, it notifies the remote tuner.

On the other hand, the remote tuning proceeds as follows.

First, a measurement command is transmitted to the wireless microphone receiver 110 through the server 130 on the GUI unit 140 of the PC 150 operated by the remote site's tuner.

The wireless microphone receiver 110 receiving the measurement command outputs the tuning sound source through the audio mixer 171 and the speaker management system 172 in the mutually connected order in the tuning target acoustic system 170, 173 are output to the speaker 174. The speaker 174 is connected to the speaker 174,

The sound waves output through the speaker 174 in the target sound system 170 are collected by the wireless microphone transmitter 100 installed in the audience and then transmitted to the wireless microphone receiver 110 in a converted state.

The electromagnetic wave output from the wireless microphone transmitter 100 is demodulated into a sound source for tuning, and the frequency response characteristic (i.e., voltage-to-frequency voltage error information per frequency) is analyzed through an internal DSP (Digital Signal Processor) The acoustic information analyzed in the wireless microphone receiver 110 having the function is transmitted to the server 130 through the network (for example, Ethernet or the like), and in the GUI unit 140 of the PC 150 viewed by the tuner, 130) and displays it on the screen.

Accordingly, the tuner checks the tuning target sound system 170 by referring to the sound information such as the frequency response displayed on the screen, determines the part to be tuned, and sends a control command to the speaker management system 172 through the server 130 again And this process is repeated to complete the tuning of the tuning target acoustic system 170.

The technical problem to be solved in such a remote tuning process is to adjust the frequency error of the frequency of a wireless microphone, which is generally made for a voice, so that it can be used for tuning, and to provide feedback Thereby eliminating the feedback oscillation.

A digital signal processor (DSP) is employed in the wireless microphone receiver 110 for this purpose.

2 is a block diagram of an internal block of a wireless microphone receiver in a remote sound tuning and management system using the wireless microphone of the present invention.

2, the wireless microphone receiver 110 includes an RF receiving and tuning unit 111, a detection and demodulation unit 112, an ADC unit 113, a DSP unit 114, a DAC unit 115, A control unit 117, a network communication unit 118, and a display unit 119. [0033]

The flow of signals to the wireless microphone receiver 110 having the above-described configuration will be described below.

First, the electromagnetic wave transmitted from the wireless microphone transmitter 100 is input to an RF receiving and tuning unit 111 in a wireless microphone receiver 110 through an antenna, and the RF receiving and tuning unit 111 receiving the electromagnetic wave Only the desired RF frequency band is amplified and transmitted to the detection and demodulation unit 112.

Therefore, the detection and demodulation unit 112 selects a desired channel among the input RF signals, converts the selected channel into an analog audio signal, and outputs the analog audio signal to the ADC unit 113. The ADC unit 113 receives the converted audio signal, 113), the analog audio signal is sampled and converted into a digital audio signal, which is then output to the DSP unit 114.

In addition, the DSP unit 114 receiving the converted digital audio signal applies a tone color adjustment filter to the DAC unit 115 when the digital audio signal is generally used, and the DAC unit 115, receiving the converted digital audio signal, So that the audio output unit 116 performs appropriate amplification and balancing processing and then outputs the processed signals to the audio mixer 171 in the target sound system 170. [

The control unit 117 of the wireless microphone receiver 110 controls a phase locked loop (PLL) (not shown) for channel selection in the detection and demodulation unit 112, And transmits the acoustic information collected by the DSP unit 114 to the server 130 via the network communication unit 118 or the DSP unit 114 according to a control command received from the server 130. [ And controls the display unit 119 to display the operation state of the current wireless microphone receiver 110 to the user.

3 is a specific block diagram of the digital signal processing apparatus, that is, the DSP unit 114, provided in the wireless microphone receiver 110. As shown in FIG.

The signal processing process in the DSP unit 114 will be described with reference to FIG.

First, the digital audio signal input to the DSP unit 114 is input to the sound absorbing unit correction filter 11413 composed of a plurality of filters through the first digital logical switch 11410, or to the second digital logical switch 11414 side Bypassed.

Here, the operation of the sound absorbing unit correction filter 11413 will be described. In general, a microphone manufactured and sold for tuning has an ideal frequency response characteristic as shown in FIG.

That is, it is necessary to have a substantially flat response from the audio frequency band of 20 Hz to 20 kHz, so that the desired voltage error of the tuning target system can be confirmed without any correction to the frequency response inputted to the instrument.

However, a non-tunable general microphone is manufactured to have a voltage error according to frequency as shown in FIG. 5 in consideration of the frequency response most susceptible to human ear and the frequency-dependent air attenuation.

That is, it has a frequency response characteristic that becomes low at a low frequency and becomes high at a high frequency at which the attenuation becomes severe.

In order to use such a general microphone for tuning, in the present invention, a plurality of digital acoustic filters, that is, a sound-absorbing unit correction filter having first to Nth filters (code-writing omitted) (11413).

The sound-absorbing unit correction filter 11413 includes a first filter for forcibly raising a low-frequency band having a lower level than the tuning microphone, a second filter for lowering the overall high-frequency band as a whole, A plurality of digital acoustic filters, such as a third filter for performing additional correction, are used to correct voltage errors per final frequency close to the tuning microphones.

Of course, FIG. 6 illustrates an example in which the number and operation mode of each filter provided in the sound absorption unit correction filter 11413 may be modified according to the voltage error information of the sound absorption unit used in the audio frequency, Control variables such as the center frequency, shape, amplification degree, attenuation and tilt of the filter are pre-stored in the control unit 117 according to the result of the sound absorption unit test in the manufacturing step.

3, the sound absorbing unit correction filter 11413 is composed of a series combination of several digital acoustic filters (first filter to Nth filter), although the digital sound filter used in this case is a bipod (Biquid) filter, and has a transfer function of the following equation (1).

And, one biquad filter consists of a second IIR (Infinite Impulse Response) filter.

The second IIR filter is controlled by a quality factor (Q) representing a center frequency (f), a gain (Boost / Cut), a linear gain, and a bandwidth.

(A1, a2, b0, b1, b2) of the above-mentioned [Expression 1] are determined by the control variables according to the following formulas (2), (3) do.

The coefficients when raising or lowering only a specific frequency band such as the first filter and the third filter are derived by the following equation (2).

The coefficients of the filter for raising or lowering the entire band above a certain frequency such as the second filter by a desired boost or cut are derived by Equation (3) below.

In contrast to the second filter, the coefficient of the filter that raises or lowers the entire band below a certain frequency by a desired boost or cut is derived by Equation (4) below.

As described above, the coefficients calculated by the control unit 117 according to the formulas (2), (3) and (4) are input from the first filter to the Nth filter, ).

The digital audio signal corrected through the sound absorbing unit correction filter 11413 or the digital audio signal bypassed from the first digital logical switch 11410 is input to the limiter 11415 via the second digital logical switch 11414 .

Accordingly, the limiter 11415 removes an audio signal of a predetermined volume or more, controls the volume of the digital audio signal to be adjusted to a specified volume or less, and then transmits the adjusted audio signal to the third digital logic switch 11416, The logic switch 11416 bypasses the digital audio signal thus received to the fourth digital logic switch 11421 or a FFT (Fast Fourier Transform) 11417-1 module or a Variable Frequency Band Pass Filter (VBPF) Detector 11417-2 module.

In general use, the first digital logical switch 11410, the second digital logical switch 11414, the third digital logical switch 11416, and the fourth digital logical switch 11421 are all bypassed, The signal is output without any additional digital signal processing.

However, in the remote tuning mode, the digital audio signal input to the third digital logic switch 11416 is fed to the FFT 11417-1 module or VBPF and detector 11417-2 in the digital audio frequency analyzer 11417 according to the selection of the tuner, And the input is not transmitted to the output side, so that the feedback oscillation can be prevented.

At this time, the FFT 11417-1 module in the digital acoustic frequency analyzer 11417, which is a fast Fourier transformer, calculates a voltage error for each frequency of the digital audio signal input according to the Fast Fourier Transform equation and outputs the result to the controller 117 And transmits it to the tuner through the network communication unit 118.

In this case, the fourth digital logical switch 11421 is connected to the pink noise (pink noise) among components in the tuning tone generator 11419, which is comprised of a pink noise generator 11419-1 or a sinewave oscillator 11419-2 Pink Noise is generated by the FFT 11417-1 of the components in the digital acoustic frequency analyzer 11417 via the tuning target acoustic system via the resistor 11422. The pink noise is generated by the FFT 11417-1, 1) module.

In order, pink noise generation takes precedence, and the pink noise is converted into frequency response information in the F.F.T (11417-1) module as a digital audio signal.

Since the Pink Noise generator 11419-1 or the FFT 11417-1 module consumes a large amount of calculation resources, if the calculation resources are limited due to problems such as the unit price and the DSP size, The frequency-dependent voltage error can be measured as a pair of the oscillator 11419-2 and the VBPF and the detector 11417-2.

This is a method of moving the frequency of the sine wave in the audible frequency band, thereby moving the pass band frequency of V.B.P.F together and measuring the input level as a detector.

The control unit 117 starts measuring the response time from the start of the output of the Pink Noise generator 11419-1 or the Sinewave oscillator 11419-2, The time required until the signal is input to the FFT 11417-1 module or the VBPF and the detector 11417-2 module in the ADC 11417 is measured and the ADC unit 113, It is possible to measure the response time of the entire acoustic system by subtracting the time delay of the DAC unit 115 and the sound absorption unit correction filter 11413.

The frequency response of the tuning target acoustic system measured in the above manner is displayed on the GUI unit 140 of the tuner PC 150 via the server 130. The tuner reads the frequency response, And sends a control command to the speaker management system 172 via the speaker 130.

In this case, as described in the related art, the speaker management system 172 includes a crossover filter for correcting the voltage error information with respect to the frequency of sound of the target sound system to be tuned, an equalizer, a forced delay for response speed correction, Volume control for volume control, limiter and compressor for abrupt over-discharge protection, and control via a GUI on the Internet.

7A and 7B are flow charts for explaining a remote sound tuning method using a wireless microphone in the present invention.

The control unit 117 determines whether the tuning start key is operated by the tuner in step S01 so that the DSP unit 114 11417-1 or VBPF and the detector 11417-2 in the digital acoustic frequency analyzer 11417 and the movable terminals of the third and fourth digital logic switches 11416, , The pink noise generator 11419-1 in the tone generator for tone generator 11419 or the fixed terminal connected to the sine wave oscillator 1142 side (S02).

Subsequently, the control unit 117 inputs a coefficient calculated in accordance with the control variable for tuning stored in advance in the sound absorption unit correction filter 11413 (S03), and then the operation of the first and second digital logic switches 11410 and 11414 Terminals to the fixed terminals respectively connected to the sound absorption unit correction filter 11413 side (S04).

Thereafter, the controller 117 switches the movable terminal of the third digital logic switch 11416 in the DSP 114 to a fixed terminal connected to the FFT 11417-1 module, and the fourth digital logic switch 11421 is switched to a fixed terminal connected to the pink noise generator 11419-1 or the movable terminal of the third digital logic switch 11416 is connected to the VBPF and the detector 11417-2 (S05) whether the movable terminal of the fourth digital logical switch 11421 is switched to the fixed terminal connected to the sine wave oscillator 11419-3 (S05). If the pink noise is selected And outputs the pink noise to the input unit of the target sound system 170 (S06).

The pink noise thus output is amplified through the tuning target sound system 170 and output to the speaker 174 (S07).

Then, the controller 117 determines whether a digital audio signal is received in the FFT 11417-1 module (S08). If the digital audio signal is received in the FFT module 11417-1, the controller 117 determines whether the digital audio signal is input through the Fast Fourier Transform And transmits the result to the server 130 through the network communication unit 118 (S09).

Accordingly, in the personal computer 150, the sound information transmitted through the server 130 is converted into a frequency-dependent response curve and displayed on the GUI 140 provided in the personal computer 150, The voltage error of each frequency can be read (S18).

Thereafter, the tuner determines whether the remote sound tuning has been completed according to the frequency response reading result, and transmits a tuning completion command to the air unit 117. The controller 117 receiving the tuning completion command determines whether or not the tuning completion command is received (q19). If the tuning is not completed, a control command is transmitted to the speaker management system 172 in the tuning target sound system 170 (S21) according to the control history of the tuner instructed through the network communication unit 118, And returns to the initial start step S01.

However, if the remote sound tuning for the wireless microphone transmitter 100 is completed, the first to fourth digital logical switches 11410, 11414, 11416, and 11421 are switched to the bypass mode that is the normal use mode S20) and ends.

If it is determined in step S05 that the tuner has selected a sine wave as the tuning sound source, the frequency to be measured is determined to be the lowest frequency (S10), and the VBPF and the detector 11417-2 are set to the measurement frequency Subsequently, measurement of the sine wave output of the measurement frequency and the response time is started (S12).

The control unit 117 continuously determines whether a digital audio signal is received at the VBPF and the detector 11417-2 at step S13. If a digital audio signal is received at the VBPF and the detector 1418, After measurement (S14), the measurement frequency is incremented according to the resolution to be measured (S15).

Thereafter, the control unit 117 determines whether the incremented frequency is greater than a predetermined maximum frequency (S16). If not, the control unit 117 returns to step S11 to adjust the VBPF and the detector 11417-2 to the measurement frequency (S17) through the network communication unit 118 (S17). When the tuner transmits the analyzed frequency level to the server 130 via the GUI 140 provided in the personal computer 150 The process goes to step S18 of reading the voltage error.

The method for measuring the response time and frequency-dependent phase of the sound system 17 to be tuned in the control unit 117 is the same as that of the pink noise generator 11419-1 or the sine wave oscillator 11419-2 The oscillation time, the reception time of the measured sound source, and the delay time of the digital sound system are combined.

On the other hand, if the control unit 117 determines that the tuning start key is in the "off" state (S01), the control unit 117 determines whether the user of the wireless microphone wants to change the timbre (S22) State, the first and second digital logic switches 11410 and 11414 are switched to bypass.

However, if the user of the wireless microphone desires to change the tone color, the control parameter for tone color change is input to the sound absorbing unit correction filter 11413 (S23), and then the first and second digital logical switches 11410 and 11414 The movable terminals are switched to the fixed terminals respectively connected to the sound absorption unit correction filter 11413 side (S24) and the process is terminated

The tuner located at a remote place can confirm the current frequency-dependent voltage error of the tuning target sound system and tune the tuning target sound system by the above process.

As a result, even if the tuner does not move to the site, it is possible to use the general use equipment in the field to adjust the sound system to be tuned, thereby ensuring stable use of the sound system and responding to urgent service requests before the performance.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

It is therefore to be understood that the embodiments described above are illustrative in all aspects and should not be construed as limiting, and the scope of the invention is indicated by the appended claims rather than the foregoing description, And all equivalents and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

100: Wireless microphone transmitter
110: Wireless microphone receiver
111: RF reception and tuning unit 112: Detection and demodulation unit
113: ADC section 114: DSP section
11410: first digital logic switch 11413: sound absorption unit correction filter
11414: second digital logical switch 11415: limiter
11416: third digital logic switch 11417: digital acoustic frequency analyzer
11417-1: FFT 11417-2: VBPF and detector
11419: Tuning sound generator
11419-1: Pink noise generator 11419-2: Sinusoidal oscillator
11421: fourth digital logic switch 11422: resistor
115: DAC unit 116: Audio output unit
117: control unit 118: network communication unit
119:
130: Server
140: GUI (Graphic User Interface)
150: Personal computer (PC)
160: Sound source equipment
170: Tuning target sound system
171: Audio Mixer 172: Speaker Management System
173: Amplifier 174: Speaker

Claims (11)

A wireless microphone transmitter for receiving a tuning sound source from a tuning target sound system and converting the sound source into an electromagnetic wave and outputting the sound wave;
And a demodulator for demodulating the electromagnetic wave output from the wireless microphone transmitter and demodulating the electromagnetic wave output from the wireless microphone transmitter into a tuning sound source and outputting a frequency-dependent voltage of the tuning sound source generated through an internal DSP (Digital Signal Processor) A wireless microphone receiver for analyzing an error of a frequency-dependent voltage of a sound source and transmitting analyzed frequency-dependent voltage error information to a server through a network;
A server for storing voltage-to-voltage error information of each frequency transmitted from the wireless microphone receiver and transmitting the voltage error information according to the request of the tuner;
A graphical user interface (GUI) for displaying voltage error information of each frequency transmitted through the network from the wireless microphone receiver in a graph interpretable by the tuner;
A voltage-dependent voltage error analyzed by the tuner through the graphical user interface
The present invention provides a network control for modifying acoustic frequency characteristics of a sound system to be tuned on the basis of information and provides various operating states and controllable variables to the graphical user interface, And a coordination target acoustic system having a management system,
The wireless microphone receiver includes:
An RF receiving and tuning unit for receiving an electromagnetic wave output from the wireless microphone transmitter and selecting a desired channel;
A detection and demodulation unit for receiving the RF reception and tuning unit and switching the selected electromagnetic wave frequency band to the tuning sound source under the control of the control unit;
An ADC unit for converting the analog sound source signal output from the detection and demodulation unit into digital sound source data;
The difference between the voltage error characteristic of the sound-absorbing unit frequency used in the wireless microphone transmitter and the voltage error characteristic of each microphone frequency for the ideal tuning are stored in the digital sound source data converted by the ADC unit, A DSP (Digital Signal Processor) for applying and correcting the digital filters for analyzing the corrected sounds, and transmitting the analyzed sounds through a network;
A DAC unit for converting a digital audio signal input from the DSP (Digital Signal Processor) back into an analog audio signal;
An audio output unit for amplifying and balancing the analog audio signal input from the DAC unit to a level desired by the user and outputting the amplified analog audio signal to an audio mixer in the tuning target sound system;
A PLL (Phase Locked Loop) for channel selection in the detection and demodulation unit is controlled, and the operation of the logic module in the DSP unit is controlled, and the sound information collected in the DSP unit is transmitted through a network communication unit A control unit for controlling the DSP unit according to a control command received from the server or for displaying the operation status of the current wireless microphone receiver to the user by controlling the display unit;
A display unit for displaying a current state of the wireless microphone receiver to the user under the control of the controller;
And a network communication unit for transmitting the voltage error information of the frequency dependent sound pressure to the server under control of the control unit or transmitting a control command transmitted from the server to the control unit.
delete delete The method according to claim 1,
The DSP includes:
A first digital logic switch for transmitting the digital audio signal input from the ADC unit to the filter unit for adjusting the sound absorption unit or bypassing the digital audio signal to the second digital logic switch;
A sound absorption unit correcting filter for correcting a digital audio signal input through the first digital logic switch according to frequency-to-frequency sound pressure-dependent information in an audible frequency of a sound-absorbing unit attached to the wireless microphone transmitter;
A sound signal output through the sound absorbing unit correction filter or a digital audio signal directly inputted through the first digital logic switch is transmitted to a limiter. Or adjusts the volume of the digital audio signal to a specified volume or less;
A digital FFT (Fast Fourier Transform) module or a variable frequency band pass filter (VBPF) in a digital sound frequency analyzer and a detector module for transmitting the digital audio signal to a detector module 3 digital logic switch;
An FFT module for calculating a voltage error for each frequency of a digital audio signal input according to a Fast Fourier Transform equation when a digital audio signal is input through the third digital logic switch and transmitting the result to a tuner through a control unit and a network communication unit; A digital acoustic frequency analyzer comprising a VBPF and a detector for detecting and filtering a variable frequency region included in the digital audio signal when the digital audio signal is input through the third digital logic switch;
A tuning sound generator including a Pink Noise Generator for generating a noise level required for tuning at the same level in the entire band or a sine wave oscillator for generating a sine wave having a predetermined frequency;
A pink noise signal output from the pink noise generator or a sine wave signal output from a sine wave oscillator or a digital audio signal bypassed from the third digital logic switch among components of the tuning sound source generator is transmitted to a resistor A fourth digital logic switch;
And a resistor for limiting a level of a pink noise signal, a sine wave signal, or a digital audio signal transmitted through the fourth digital logic switch to a DAC unit.
The method of claim 4,
The sound-absorbing-unit-
Wherein a plurality of secondary IIR (Infinite Impulse Response) filters are connected in series.
The method of claim 4,
The sound-absorbing-unit-
And a plurality of unit filters, which can be used as a filter for raising or lowering a band of a frequency higher or lower than a specific frequency as a whole, are connected in series. Remote sound tune system using.
The method of claim 4,
Wherein the control variable of the sound absorption unit correction filter includes:
Characterized in that the characteristics are previously calculated and stored in such a manner that they can be corrected in the same manner as an ideal tuning microphone according to the sound pressure unit-to-sound-pressure voltage error information of the sound-absorbing unit of the wireless microphone transmitter.
A remote sound tuning method using a wireless microphone transmitter, a wireless microphone receiver, a server, a graphical user interface (GUI) provided in a personal computer, and an acoustic system,
Determining whether the tuner manipulates the tuning start key;
When the tuning start key is "on ", the control terminals of the wireless microphone receiver are respectively connected to the FFT (Fast Fourier Transform) module in the digital acoustic frequency analyzer, and the movable terminals of the third and fourth digital logic switches provided in the DSP (Digital Signal Processor) Or a variable frequency band pass filter (VBPF) and a fixed terminal connected to the detector module side and a pink noise generator or a sine wave oscillator side of the tuning sound generator, respectively;
Inputting a coefficient calculated according to a control variable for tuning stored in advance in a sound-absorbing unit correction filter;
Switching the movable terminals of the first and second digital logic switches to fixed terminals respectively connected to the sound absorption unit correction filter side;
If the tuner switches the movable terminal of the third digital logic switch in the DSP to the fixed terminal connected to the FFT module and the movable terminal of the fourth digital logic switch is switched to the fixed terminal connected to the pink noise generator, Outputting noise to an input of a tuning target acoustic system;
Amplifying the pink noise through the tuning target sound system and outputting the amplified pink noise;
Continuing to determine whether a digital audio signal is received in the FFT module;
If the digital audio signal is received in the FFT module, calculating a voltage error for each frequency of the input digital audio signal according to the Fast Fourier Transform equation and transmitting the result to the server through the network communication unit;
When the server storing the frequency-dependent voltage error data is transmitted in response to a request from the tuner, the sound information transmitted from the server is converted into a frequency-dependent response curve, displayed on a GUI provided in the personal computer, Reading an analyzed frequency-dependent voltage error that is being displayed on the GUI;
Determining whether the tuning has been completed;
Transmitting the control command to the speaker management system according to the frequency-dependent voltage error read through the network communication unit and returning to the initial start step if the tuning is not completed;
And switching the first to fourth digital logic switches to a bypass mode in a normal use mode and terminating the tuning when the tuning is completed.
The method of claim 8,
Converting the movable terminals of the first and second digital logic switches to fixed terminals respectively connected to the sound absorption unit correction filter side,
When the tuner switches the movable terminal of the third digital logic switch in the DSP to the fixed terminal connected to the VBPF and the detector and switches the movable terminal of the fourth digital logic switch to the fixed terminal connected to the sine wave oscillator, Determining a desired frequency as a lowest frequency;
Adjusting the VBPF and the detector to the measurement frequency;
Starting a measurement of the sinusoidal output and response time of the measured frequency;
Continuously determining whether a digital audio signal is received at the VBPF and the detector;
Measuring a signal level measurement and response time when a digital audio signal is received at the VBPF and detector;
Incrementing the measurement frequency according to the resolution to be measured;
Determining whether the incremented frequency is greater than a predetermined maximum frequency and returning to the step of adjusting the VBPF and the detector to the measurement frequency if not greater;
If the incremented frequency is greater than the predetermined maximum frequency, the frequency-based measurement level is transmitted to the server through the network communication unit. When the server storing the frequency-based voltage error data is transmitted at the request of the personal computer at the request of the tuner, And converting the sound information received from the tuner into a frequency-dependent response curve, displaying it on a GUI provided in the personal computer, and reading the analyzed frequency-dependent voltage error displayed on the GUI by the tuner A remote sound tuning method using a wireless microphone.
The method of claim 9,
The response time and frequency-dependent phase measurement of the target acoustic system,
Wherein the oscillation time of the pink noise generator or the sine wave oscillator, the reception time of the measured sound source, and the delay time of the digital acoustic system are combined.
The method of claim 8,
Determining whether the user of the wireless microphone wants to change the timbre if the tuning start initial tuning start key is in the "off"state;
Switching the first and second digital logic switches to bypass if no tone change is desired;
Inputting a control variable for changing a tone color to a sound-absorbing unit correction filter when the tone color is desired to be changed;
And switching the movable terminals of the first and second digital logic switches to the fixed terminals respectively connected to the sound absorption unit correction filter side and terminating the step of terminating the remote sound tuning method.

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