KR20160133268A - System and method for processing sound signal - Google Patents

System and method for processing sound signal Download PDF

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Publication number
KR20160133268A
KR20160133268A KR1020150066161A KR20150066161A KR20160133268A KR 20160133268 A KR20160133268 A KR 20160133268A KR 1020150066161 A KR1020150066161 A KR 1020150066161A KR 20150066161 A KR20150066161 A KR 20150066161A KR 20160133268 A KR20160133268 A KR 20160133268A
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signal
sound
unit
acoustic signal
acoustic
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KR1020150066161A
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KR101687675B1 (en
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백민호
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(주)에어사운드
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The present invention relates to a real-time acoustic signal processing system and method, and more particularly, to a system and method for real-time acoustic signal processing that includes a plurality of sound pickups for collecting sounds to generate sound signals, And a speaker for outputting sound in response to the processed sound signal, and a speaker for outputting the sound in response to the processed sound signal. According to the present invention, it is possible to improve the presence feeling by minimizing the delay of the acoustic signal and to install the speaker in a wide space (long distance), so that the installation area of the wireless speaker can be expanded.

Description

[0001] SYSTEM AND METHOD FOR PROCESSING SOUND SIGNAL [0002]

The present invention relates to a radio signal processing technology, and more particularly, to a real-time acoustic signal processing system and method that can minimize the delay of an acoustic signal.

Acoustic equipment usually consists of a microphone, a main unit (amplifier) and a speaker, which are usually connected to each other by a wire.

Meanwhile, in order to solve the inconvenience caused by the connection of a microphone, an amplifier, and a speaker by wire, a wireless microphone and a wireless speaker have been widely used recently.

However, when the wireless microphone and the wireless speaker are wirelessly connected to the main body, a sound signal must be transmitted through wireless communication, so that a delay may occur in the transmission of the sound signal. That is, since the wireless microphone, the main body, and the wireless speaker perform digital-to-analog conversion, data encoding / decoding, security code insertion / authentication, modulation / demodulation, etc., There is a problem that occurs. For example, there is a problem in that the sense of presence is deteriorated due to the difference between the time when the lecturer generates the sound through the wireless microphone and the time that is output through the wireless speaker.

On the other hand, the present applicant has filed a sound collector for picking up sound, and this sound collector is also one of the sound equipment. The sound recorder is arranged, for example, around a lecturer, and collects the lecturer's sound. Then, the sound signal can be transmitted to a speaker, a smart phone, or the like and output from the corresponding device. However, when the sound collector and the speaker transmit sound signals through a wireless communication method, a certain bandwidth for wireless communication may be required to process the sound signals generated by the sound collectors.

Thus, it is necessary to provide a method for quickly and effectively transmitting the acoustic signal in consideration of the tendency that the surrounding environment is becoming wireless.

Korean Patent Publication No. 10-2004-0076983 (published September 4, 2004). Korean Published Patent Application No. 10-2012-0013179 (Publication date 2012.02.14.)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for processing a sound signal by minimizing or eliminating processes such as security code insertion, data encoding / And to provide a real-time acoustic signal processing system and method that enable efficient use of a wireless network through selective processing of acoustic signals.

According to an aspect of the present invention, there is provided a real-time audio signal processing system including a plurality of sound pickups for picking up sounds to generate sound signals, selecting a specific sound signal through selective switching on the sound signals, A sound signal generator main body including an acoustic signal processor for uncompressing and transmitting a specific acoustic signal; An acoustic signal transmission / reception processor for receiving and processing the transmitted acoustic signal; And a speaker for outputting sound corresponding to the processed sound signal.

Wherein the acoustic signal processor comprises: an acoustic signal intensity measuring unit measuring an intensity of a plurality of acoustic signals transmitted from the sound pickup unit; An acoustic signal selection unit for selecting an acoustic signal that is equal to or larger than a set value that changes in real time in accordance with the inputted user operation signal and bandwidth information; And an uncompressed transmission file generating and transmitting unit for generating and transmitting a transmission file in a non-compressed manner with respect to the selected acoustic signal.

The sound signal selection unit may include: a volume control unit for adjusting a volume corresponding to the user operation signal; A bandwidth adjuster for adjusting the bandwidth to a maximum possible value corresponding to the bandwidth information; And a switching unit for passing the sound signal corresponding to the value adjusted in real time by the volume control unit and the bandwidth control unit.

The non-compressed transmission file generating and transmitting unit includes: a bit input unit for generating a bit input signal from a sound signal; A symbol mapping unit for mapping the bit input signal to generate a data block; A fast Fourier transformer for transforming the frequency domain data of the symbol mapping unit into time domain data and orthogonalizing the generated carrier signals; A guard interval inserter inserting a guard interval into the inversely transformed data to generate a transmission file; A D / A converter for converting the transmission file into the analog signal; A wireless signal conversion unit for converting the converted analog signal into a wireless signal for wireless transmission; A switch for alternately switching the radio signal; And a plurality of transmitting and receiving antennas for transmitting radio signals transmitted in response to the alternating switching.

The acoustic signal transmission / reception processor includes: a transmission / reception antenna for receiving a radio signal; A radio signal converter for converting the radio signal into an analog signal; An A / D converter for converting the converted analog signal into an acoustic signal, which is a digital signal; A wrapping surround adding unit for converting the converted acoustic signal into an annular convolution; A fast Fourier transform unit for transforming the converted circular convolution into a frequency domain signal; A channel estimator for estimating a channel with respect to the acoustic signal converted into the frequency domain signal; A maximum rate reception combining unit for performing maximum rate reception combining according to an estimated channel and a channel estimated for a frequency domain signal; And an acoustic output unit for finally determining and outputting a reception signal in the frequency domain signal.

In the meantime, the real-time sound signal processing method of the present invention is characterized in that (a) an acoustic signal processor receives an acoustic signal generated from a microphone of each sound recorder and transmits only a specific acoustic signal, Generating a file and transmitting the generated file to a sound signal transmitting / receiving processor; And (b) reproducing the sound signal in the sound signal transmitting and receiving processor.

The step (a) includes: generating a bit input signal from a sound signal at a bit input unit; Generating a data block by symbol-mapping a bit input signal in a symbol mapping unit; Converting the frequency domain data of the symbol mapping unit into time domain data in a fast Fourier transform unit and orthogonalizing the generated carrier signals; And generating a transmission file by inserting a guard interval into the inverse-transformed data in the guard interval inserting unit.

The step (b) includes the steps of: converting the transmission file into an acoustic signal; converting the acoustic signal into an annular convolution in a wrapping surround adding unit; Converting an annular convolution to a frequency domain signal in a fast Fourier transform unit; Estimating a channel for an acoustic signal converted into a frequency domain signal by a channel estimating unit; Performing a maximum rate reception combining according to an estimated channel and a channel estimated for a frequency domain signal in a maximum rate reception combining unit; And a step of outputting sound as the sound output unit finally determines and outputs the received signal in the frequency domain signal.

As described above, according to the system and method for real-time acoustic signal processing according to the present invention, it is possible to improve the sense of presence by minimizing the delay of the acoustic signal.

Further, since the delay of the acoustic signal is minimized, the speaker can be installed in a wide space (long distance), so that the installation area of the speaker can be expanded.

1 is a block diagram of a real-time acoustic signal processing system according to an embodiment of the present invention.
2 is a block diagram of an acoustic signal processor according to an embodiment of the present invention.
3 is a configuration diagram of an acoustic signal selection unit according to an embodiment of the present invention.
4 is a configuration diagram of an uncompressed transmission file generating and transmitting unit according to an embodiment of the present invention.
5 is a block diagram of a sound signal transmission / reception processor according to an embodiment of the present invention.
6 to 14 are various examples of the sound pickup machine applied to the present invention.
15 is an exemplary view of a main body of a neck type acoustic signal generator applied to the present invention.
16 is a configuration diagram of a real-time acoustic signal processing system according to another embodiment of the present invention.
17 is a flowchart of a method for processing a real time sound signal according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system and method for real-time acoustic signal processing according to the present invention will be described in detail with reference to the accompanying drawings.

First, the same reference numerals will be assigned to configurations that perform the same function in the drawings.

1 is a block diagram of a real-time acoustic signal processing system according to an embodiment of the present invention.

Referring to FIG. 1, the real-time sound signal processing system of the present invention includes a plurality of sound pickups 1 for picking up sounds to generate sound signals, a selector for selecting a specific sound signal through selective switching on the sound signals, A sound signal generator main body including an acoustic signal processor 2 for uncompressing and transmitting a specific acoustic signal, an acoustic signal transmitter / receiver 3 for receiving and processing the transmitted acoustic signal, And a speaker 4 for outputting a voice signal.

Here, in this embodiment, the sound pickup unit 1 and the sound signal processor 2 are configured in the main body of the sound signal generating device, but these components can be separately configured and configured. In addition to the wired communication method, And mutual data can be transmitted and received. At this time, when the sound pickup unit 1 and the sound signal processor 2 transmit and receive data in a wireless communication manner, a mutual communication unit is formed. The communication unit can use the following features of the present invention.

In this embodiment, the acoustic signal transmission / reception processor 3 and the speaker 4 are connected by wire. However, the acoustic signal transmission / reception processor 3 and the speaker 4 may also use a wireless communication system, In this case, the acoustic signal transmission / reception processor 3 and the speaker 4 constitute a mutual communication unit, which can utilize the following features of the present invention.

Then, the acoustic signal transmission / reception processor 3 is included in each of the speakers 4, so that it can be operated as a completely independent wireless speaker.

2 is a block diagram of an acoustic signal processor according to an embodiment of the present invention.

2, the acoustic signal processor 2 of the present invention includes an acoustic signal intensity measuring unit 21 for measuring the intensity of a plurality of acoustic signals transmitted from a sound collector, And an uncompressed transmission file creation and transmission unit 23 for generating and transmitting a transmission file in a non-compressed manner with respect to the selected sound signal do.

3 is a configuration diagram of an acoustic signal selection unit according to an embodiment of the present invention.

3, the sound signal selector 22 of the present invention includes a volume controller 221 for adjusting a volume corresponding to a user's operation signal, a bandwidth controller 220 for adjusting the bandwidth to a maximum value corresponding to the bandwidth information, And a switching unit 223 for passing an acoustic signal corresponding to the value adjusted in real time by the volume control unit 221 and / or the bandwidth control unit 222. [

Here, the bandwidth controller 222 includes a function for diagnosing the available bandwidth currently being used and for diagnosing a bandwidth of another frequency. That is, in the present invention, it is preferable to use a plurality of frequencies. In this case, the bandwidth controller 222 performs a diagnosis on the bandwidth of each frequency so as to select a frequency having the largest available bandwidth among various frequencies, .

In the acoustic signal selector 22 of the present invention, when the user increases the volume, the number of acoustic signals passing through the switching unit 223 increases, and even when the bandwidth is maximized, the acoustic signal passing through the switching unit 223 The number of signals is increased. In this way, the delay due to the wireless signal transmission is minimized by adjusting the number of acoustic signals to be signal processed in consideration of the user operation signal and / or the bandwidth state.

4 is a configuration diagram of an uncompressed transmission file generating and transmitting unit according to an embodiment of the present invention.

4, the uncompressed transmission file generating and transmitting unit 23 of the present invention includes a bit input unit 231 for generating a bit input signal from a sound signal, An Inverse Fast Fourier Transform (IFFT) 233 for converting the frequency domain data of the symbol mapping unit 232 into time domain data and orthogonalizing the generated carrier signals, A guard interval inserting unit 234 for inserting a guard period into the inversely converted data to generate a transmission file, a D / A converter 235 for converting the transmission file into which the guard interval is inserted into an analog signal, A radio signal converter 236 for converting the converted analog signal into a radio signal for radio transmission, a switch 237 for alternately switching the radio signal, and a plurality of And a transmission / reception antenna 238.

Here, the symbol mapping unit 232 maps the data bits to complex symbols. The complex symbols are used to modulate a carrier for wireless transmission. The symbol mapping unit 232 may be any of a binary phase shift keying (BPSK), a quadrature phase shift keying (QPSK) scheme, and a quadrature amplitude modulation (QAM) scheme One can be used.

The fast Fourier transformer 233 converts the frequency domain data from the symbol mapping unit 232 back to the corresponding time domain data. That is, it converts the number of complex symbols representing a signal in the frequency domain into a corresponding time domain signal. In addition, the fast Fourier transformer 233 causes the generated carrier signals to be orthogonal.

The guard interval inserting unit 234 adds a guard interval to the processing signal block of the fast Fourier transform unit 233 at the preceding stage to reduce receiver congestion. The duration of such guard interval may be 1/32, 1/16, 1/8, 1/4 of the duration of the original signal block, depending on the actual channel conditions and the appropriate receiver congestion.

The transmit / receive antenna 238 may include any antenna system or a module suitable for wirelessly transmitting uncompressed acoustic signals.

5 is a block diagram of a sound signal transmission / reception processor according to an embodiment of the present invention.

5, the acoustic signal transmission / reception processor 3 of the present invention includes a transmission / reception antenna 31 for receiving a radio signal, a radio signal converter 32 for converting a radio signal into an analog signal, An A / D converter 33 for converting the converted circular signal into a digital signal (acoustic signal), a lapping surround adder 34 for converting the converted acoustic signal into an annular convolution, A fast Fourier transform (FFT) unit 35 for estimating a frequency domain signal, a channel estimation unit 36 for estimating a channel for an acoustic signal converted into a frequency domain signal, A maximum rate reception combining unit 37 for performing maximum rate reception combining according to the frequency band of the frequency domain signal, and an acoustic output unit 38 for finally determining and outputting the reception signal in the frequency domain signal.

6 to 14 are various examples of the sound pickup machine applied to the present invention.

6 to 14, it is preferable that the first collection part 11 has a hollow hemispherical shape, and it is preferable to form a hole H1 for allowing sound to pass through the bottom of the first collection part 11. Inside the bottom part, It is preferable to form a coupling step 111 for coupling with the second collection part 12.

The second collection part 12 preferably has a hollow hemisphere shape having a radius smaller than that of the first collection part 11. It is preferable to form the collection hall H2 on the bottom surface of the second collection part 12, It is preferable to form the coupling protrusion 121 to be coupled to the coupling step 111 of the first collection part 11. [

Here, the first spiral part 11 and the second scavenging part 12 are maintained at predetermined intervals by the coupling step 111 and the coupling protrusion 121. [ In this embodiment, the case where the first pick-up portion 11 and the second pick-up portion 12 maintain the set spacing by the coupling protrusion 111 and the coupling protrusion 121 is exemplified, but various separation methods are applied The first collecting part 11 and the second collecting part 12 can be formed by selectively forming protrusions or the like that minimize the disturbance of sound progression inside the first collecting part 11 and the second collecting part 12, The sound section 12 will be able to maintain the set interval.

Meanwhile, the second collection part 12 may further include a storage part 122 extending from a hollow hemispherical shape. Here, the acoustic hole H3 may be formed at the boundary portion between the second collection part 12 and the storage part 122. [ In addition, the sound receiving unit 122 can be housed with the sound processing unit 13. Here, the sound processing unit 13 includes a plurality of microphones 131 arranged at predetermined intervals. Here, the sound source direction can be determined using one sound collector 1 having a plurality of microphones 131. That is, the same process as shown in FIG. 2 can be applied to the acoustic signals generated from the plurality of microphones 131. In this embodiment, a plurality of sound pickup units 1 are used. Therefore, it is assumed that there is no time difference between the sound signals generated from the microphones 131 formed in one sound pickup unit 1.

The outer peripheral portion of the receiving portion 122 may be formed with a flange that can be fixed to a wall surface or a ceiling using a fixing member.

In addition, the receiving portion 122 may be formed with a coupling ring 123 that can be fastened to the fixing portion 14 fixed to the wall surface or the ceiling. At this time, when the storage portion 122 is coupled to the fixing portion 14, the sound processing portion 13 may be housed in the fixing portion 14. [

In this case, the fixing portion 14 includes a flange 141 formed with a hole into which a fixing member is inserted so as to be fixed to a wall surface or a ceiling, a flange 141 connected to the flange 141, And a hollow insert 142 that is inserted into the insert 122.

At this time, it is preferable that a substrate or the like is provided at the entrance of the inserting portion 142. Of course, the mounting position of the substrate can be changed in the hollow insertion portion 142. The height of the inserting portion 142 is preferably equal to or smaller than the height of the receiving portion 122.

On the other hand, the first collector 11 and the second collector 12 can be selectively coupled to the fixing part 14. [ At this time, it is preferable that the second collection part 12 is coupled to the fixing part 14 and the first collection part 11 is coupled to the second collection part 12. Thus making it easier to manufacture, assemble and disassemble.

On the other hand, the directional mount 15 can be used so that the sound pickup unit 1 of the present invention can be installed with directionality.

The directional mount 15 is fixed to the wall surface or the ceiling so that the fixing portion 14 and the directional mount 15 are coupled by separate joining members. The joining member may be a joining projection, a joining jaw, a fixing member, or the like. The directional mount 15 can be formed between 0 and 90 degrees ahead of the direction of the sound pickup 1, for example, with reference to the ground direction.

On the other hand, the function of the directional mount 15 may be formed in the fixing portion 14.

15 is an exemplary view of a main body of a neck type acoustic signal generator applied to the present invention.

Referring to FIG. 15, the main body of a neck type acoustic signal generating apparatus according to the present invention includes a compact sound pickup unit and an acoustic signal processor, and includes a configuration shown in FIG. 2 and an uncompressed transmission file generating and transmitting unit 3, as shown in Fig.

Meanwhile, in the present embodiment, a description has been given of a case of transmitting an acoustic signal to an acoustic signal transmission / reception processor in an acoustic signal processor, but conversely, in the case of transmitting acoustic signals to an acoustic signal processor in an acoustic signal transmission / . That is, even when the acoustic signal transmission / reception processor is connected to an acoustic device for generating sound and the acoustic signal generated by the acoustic device is transmitted to the acoustic signal processor through the acoustic signal transmission / reception processor, the acoustic signal delay prevention technique of the present invention is applied .

16 is a configuration diagram of a real-time acoustic signal processing system according to another embodiment of the present invention.

Referring to FIG. 16, in the real-time acoustic signal processing system shown in this embodiment, in order to prevent the delay of the acoustic signal, the acoustic signal transmission / reception processor 3 ' ), And the acoustic signal processor 2 'includes the configuration of Fig.

That is, when a receiver (earphone) 5 or a speaker 6 is formed on the neck type sound signal generating apparatus main body as shown in FIG. 15, the delay of the sound signal transmitted from the sound apparatus 7 is minimized, Can be output from the generating device main body.

As a result, the present invention can be applied to a configuration for performing a transmission-side function for preventing a sound signal delay from being performed by the sound signal processor 2, 2 'and a sound signal transmission / reception processor 3, 3' Respectively.

Hereinafter, the real-time acoustic signal processing method of the present invention using the system configured as described above will be described.

First, a description will be made of a process of forming a wireless channel during an acoustic signal processor and an acoustic signal transmission / reception process.

The sound signal transmission / reception processor initializes and initializes the initialization routine, initializes the wireless interface, and then activates the wireless sound receiving software, which is application software, to finish running the application software and wait for connection of the transmission application. The acoustic signal processor executes a sound transmission program to select a sound signal transmission / reception processor connectable in a wireless channel. At this time, the acoustic signal processor transmits the IP address and port to the sound signal transmission / reception processor by UDP multicast for channel connection negotiation. Then, the sound signal transmission / reception processor performs channel connection negotiation and starts UDP listening for sound reception. Then, the sound signal transmission / reception processor requests to establish a TCP connection with the IP address and port of the transmitting application. The transmitting terminal adds the IP address of the TCP-connected acoustic signal transmitting / receiving processor to the transmission list, registers the connectable acoustic signal transmission / reception processor in the transmission list, sets a target for transmitting the acoustic signal, and transmits the acoustic signal to the acoustic signal processor Process period wireless channel is formed.

17 is a flowchart of a method for processing a real time sound signal according to an embodiment of the present invention.

Referring to FIG. 17, as an example, when a lecturer generates sound, the generated sound is collected through a plurality of sound pickup units 1. At this time, the sounds picked up by the respective sound pickup units 1 corresponding to the position of the instructor have different sound magnitudes and time differences. In each sound collector 1, an acoustic signal is generated through a microphone and transmitted to the acoustic signal processor 2 (S1).

In the sound signal processor 2, only the sound signal corresponding to the sound intensity corresponding to the current set value is transmitted to the sound signal transmitted from each sound pickup unit 1, for example, S2, A transmission file is generated in a non-compressed manner with respect to the signal (S3).

The process of generating a transmission file in a non-compressed manner is as follows.

First, a bit input unit 231 generates a bit input signal from a sound signal, and a symbol mapping unit 232 generates a data block by symbol-mapping the bit input signal. Then, the fast Fourier transformer 233 transforms the frequency domain data of the symbol mapping unit 232 into time domain data, and orthogonally generates the generated carrier signals. In the guard interval inserting unit 234, a guard interval is inserted into the inversely transformed data to generate a transmission file.

Thereafter, D / A conversion and radio signal conversion are performed on the transmission file, and the radio signal is transmitted to the transmission / reception processor 4 through the transmission / reception antenna 238.

In the acoustic signal transmission / reception processor 4, when the wireless signal is received by the transmission / reception antenna 31, the wireless signal conversion unit 236 converts the wireless signal into an analog signal, Converts the signal into a digital signal (acoustic signal). Thereafter, the lapping surround adder 34 converts the acoustic signal into an annular convolution, and the fast Fourier transformer 35 converts the annular convolution into a frequency domain signal. Meanwhile, the channel estimation unit 36 estimates a channel with respect to the acoustic signal converted into the frequency domain signal, and the maximum rate reception combining unit 37 receives the maximum rate reception . Then, as the final output of the frequency-domain signal is determined by the sound output unit 38, the sound is outputted through the speaker 4 (S4).

On the other hand, when the sound signal processor receives the transmission end signal or the set time elapses, the sound signal processor generates and transmits the sound transmission end message to the sound signal transmission / reception processor. The sound signal transmission / reception processor processes the end message, disconnects the connection with the currently connected sound transmission program, and terminates the sound reception program. The sound signal processor terminates the sound transmission program to stop the transmission of the sound signal. Thereafter, the acoustic signal processor and the acoustic signal transmission / reception processor return to the initial state and wait for the acoustic signal to be generated. Thereafter, when a sound signal is generated, the process of forming the wireless channel is repeated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: Sound collector
2, 2 ': acoustic signal processor
3, 3 ': Acoustic signal transmission / reception processor
4: Speaker

Claims (8)

And a sound signal processor for selecting a specific sound signal through selective switching of the sound signal and uncompressing the selected specific sound signal to generate a sound signal, An apparatus body;
An acoustic signal transmission / reception processor for receiving and processing the transmitted acoustic signal; And
And a speaker for outputting sound corresponding to the processed sound signal.
The method according to claim 1,
Wherein the acoustic signal processor comprises:
An acoustic signal intensity measuring unit for measuring the intensity of a plurality of acoustic signals transmitted from the sound pickup unit;
An acoustic signal selection unit for selecting an acoustic signal that is equal to or larger than a set value that changes in real time in accordance with the inputted user operation signal and bandwidth information; And
And an uncompressed transmission file generating and transmitting unit for generating and transmitting a transmission file in a non-compressed manner with respect to the selected acoustic signal.
3. The method of claim 2,
Wherein the sound signal selection unit comprises:
A volume control unit for controlling the volume corresponding to the user operation signal;
A bandwidth adjuster for adjusting the bandwidth to a maximum possible value corresponding to the bandwidth information; And
And a switching unit for passing an acoustic signal corresponding to a value adjusted in real time by the volume control unit and the bandwidth control unit.
3. The method of claim 2,
Wherein the uncompressed transmission file creation and transmission unit comprises:
A bit input unit for generating a bit input signal from the acoustic signal;
A symbol mapping unit for mapping the bit input signal to generate a data block;
A fast Fourier transformer for transforming the frequency domain data of the symbol mapping unit into time domain data and orthogonalizing the generated carrier signals;
A guard interval inserter inserting a guard interval into the inversely transformed data to generate a transmission file;
A D / A converter for converting the transmission file into the analog signal;
A wireless signal conversion unit for converting the converted analog signal into a wireless signal for wireless transmission;
A switch for alternately switching the radio signal; And
And a plurality of transmission and reception antennas for transmitting radio signals transmitted in response to alternate switching.
The method according to claim 1,
The acoustic signal transmission /
A transmitting and receiving antenna for receiving a radio signal;
A radio signal converter for converting the radio signal into an analog signal;
An A / D converter for converting the converted analog signal into an acoustic signal, which is a digital signal;
A wrapping surround adding unit for converting the converted acoustic signal into an annular convolution;
A fast Fourier transform unit for transforming the converted circular convolution into a frequency domain signal;
A channel estimator for estimating a channel with respect to the acoustic signal converted into the frequency domain signal;
A maximum rate reception combining unit for performing maximum rate reception combining according to an estimated channel and a channel estimated for a frequency domain signal; And
And a sound output unit for finally determining and outputting the received signal in the frequency domain signal.
(a) a sound signal processor receives an acoustic signal generated from a microphone of each sound collector and generates a transmission file in a non-compressed manner by passing only a specific acoustic signal over a set value that changes in real time, and transmits the transmission file to a sound signal transmission / reception processor ; And
(b) reproducing the sound signal in the sound signal transmitting / receiving processor.
The method according to claim 6,
The step (a)
Generating a bit input signal from a sound signal in a bit input unit;
Generating a data block by symbol-mapping a bit input signal in a symbol mapping unit;
Converting the frequency domain data of the symbol mapping unit into time domain data in a fast Fourier transform unit and orthogonalizing the generated carrier signals; And
And inserting a guard interval into the inverse-transformed data in the guard interval inserting unit to generate a transmission file.
The method according to claim 6,
The step (b)
When the transmission file is converted into an acoustic signal,
Converting an acoustic signal into an annular convolution in a wrapping-around addition section;
Converting an annular convolution to a frequency domain signal in a fast Fourier transform unit;
Estimating a channel for an acoustic signal converted into a frequency domain signal by a channel estimating unit;
Performing a maximum rate reception combining according to an estimated channel and a channel estimated for a frequency domain signal in a maximum rate reception combining unit; And
And outputting a sound signal in response to the final determination of the received signal in the frequency domain signal and outputting the signal in the frequency domain signal.
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