JP2021113854A - Audio signal receiver, and audio signal transmission system - Google Patents

Abstract

To reproduce an audio with almost no auditory discomfort, even if there is interruption of the audio in an audio signal receiver.SOLUTION: An audio signal receiver for receiving a transmission signal including audio data of an audio signal transmitted from an audio signal transmitting device is disclosed. The audio signal receiver includes: a first storage unit which stores voice data for a plurality of voice blocks corresponding to a predetermined time in the audio data of the received transmission signal; a complementary processing unit which calculates an amount of change per predetermined unit time in a final part of the audio data of each stored audio block, and retrieves audio data of a similar portion where the calculated amount of change per unit time is within a predetermined range, and stores it in a second storage unit as complementary audio data; and a control unit which outputs the stored complementary audio data so as to be substantially matched with an amplitude of the audio data before substitution instead of the received audio data, when the audio data of the audio signal transmitted from the audio signal transmitting device is received in error.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an audio signal receiving device that receives an audio signal from an audio signal transmitting device such as a wireless microphone device, and an audio signal transmission system including the audio signal receiving device and the audio signal receiving device.

It is known that it is difficult to use a general error correction method because a voice signal transmission system using a wireless microphone device is required to have low delay and no omission. For example, Patent Document 1 discloses an audio signal transmission system using a DECT (Digital Enhanced Cordless Telecommunications) communication system, which is an asynchronous wireless transmission system.

Japanese Patent No. 6486452 Japanese Unexamined Patent Publication No. 2007-036759 Japanese Unexamined Patent Publication No. 2006-174028 Japanese Patent No. 4250452

In order to prevent interruption of the received voice, for example, it is possible to request the transmitting device to retransmit the voice signal (see, for example, Patent Document 2), but buffering is required in both the transmitting device and the receiving device. However, there is a problem that it is difficult to perform signal processing in real time.

Further, it is possible to add redundant data such as CRC (Cyclic Redundancy Code) to error-correct the voice signal (see, for example, Patent Document 3), but if it is completely omitted, the error correction cannot be decoded. However, if the redundant data is not prepared, the decoding cannot be performed, and it is necessary to transmit the transmission data for the redundant data even in the normal state, so that there is a problem that the transmission rate cannot be increased.

Further, although there is a technique for reproducing past voice data when an error occurs, noise and discomfort occur at the connection portion. Further, when the past audio data is reproduced as it is, there is a problem that the joint of the audio data becomes a large frequency fluctuation and becomes noise, and when the past audio data is reproduced with the same amplitude, a sense of discomfort occurs in the auditory sense.

For example, Patent Document 4 discloses an asynchronous digital wireless communication system for preventing audio interruption due to underflow or the like in a receiving device. In this wireless communication system, the decoded voice data is alternately written to the first memory bank and the second memory bank in packet units, and the voice data from the first memory bank or the second memory bank is written. When reading and switching, if the memory bank to be switched next becomes an underflow state, the voice data from the memory bank storing normal voice data is output until the state is resolved. However, there is a problem that it can only deal with underflow in packet units and cannot deal with burst-like audio interruptions.

An object of the present disclosure is an audio signal receiving device capable of solving the above problems and reproducing an audio with almost no auditory discomfort even if the audio signal receiving device has a break in the audio, and the audio signal receiving device. The purpose is to provide an audio signal transmission system equipped with the above.

The audio signal receiving device according to one aspect of the present disclosure is
An audio signal receiving device that receives a transmission signal including audio data of an audio signal transmitted from an audio signal transmitting device.
A first storage unit that stores the voice data of a plurality of voice blocks corresponding to a predetermined time in the voice data of the received transmission signal, and a first storage unit.
In the final part of the voice data of each stored voice block, the amount of change per unit time is calculated, and the voice data of similar parts where the calculated amount of change per unit time is within a predetermined range is searched. Complementary processing unit that stores the complementary voice data in the second storage unit,
When the voice data of the voice signal transmitted from the voice signal transmitting device is received in error, the stored complementary voice data is substantially matched with the amplitude of the voice data before substitution instead of the received voice data. The control unit that outputs to
It is characterized by having.

Therefore, according to the audio signal receiving device according to the present disclosure, even if the audio signal receiving device interrupts the audio, the audio can be reproduced with almost no auditory discomfort.

It is a block diagram which shows the structural example of the wireless microphone apparatus 100 which concerns on embodiment. It is a block diagram which shows the structural example of the wireless receiver 200 which concerns on embodiment. It is a figure which shows an example of the signal format which transmits the audio signal data used in the wireless microphone apparatus 100 of FIG. 1 and the wireless receiver device 200 of FIG. It is a waveform diagram which shows the method of detecting the similar part of the signal waveform in the audio signal voltage in the wireless receiver 200 of FIG. FIG. 5 is a flowchart showing a normal reception process executed by the DSP (digital signal processor) unit 50 of the wireless reception device 200 of FIG. It is a flowchart which shows the save of the voice sample and the vector calculation process (S2) which are the subroutine of FIG. It is a flowchart which shows the vector calculation process (S12) of the voice sample which is the subroutine of FIG. It is a flowchart which shows the vector saving and the complementary voice data search setting processing (S23) of the voice sample which is a subroutine of FIG. FIG. 5 is a flowchart showing an error reception process executed by the DSP unit 50 of the wireless reception device 200 of FIG. It is a flowchart which shows the error reception recovery processing which is a subroutine of FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the inventor intends to limit the subject matter described in the claims by those skilled in the art by providing the accompanying drawings and the following description in order to fully understand the present disclosure. is not it.

(Embodiment)
Hereinafter, embodiments will be described with reference to FIGS. 1 to 10.

FIG. 1 is a block diagram showing a configuration example of the wireless microphone device 100 according to the embodiment, and FIG. 2 is a block diagram showing a configuration example of the wireless reception device 200 according to the embodiment.

A wireless microphone system that is a voice signal transmission system using, for example, a DECT (Digital Enhanced Cordless Telecommunications) communication system that is an asynchronous wireless transmission system by the wireless microphone device 100 and the wireless receiver device 200 that are wireless transmitters according to the present embodiment. To configure. Here, the present embodiment is characterized in that, in particular, the wireless receiver 200 executes the normal reception process of FIGS. 5 to 8, the error reception process of FIG. 9, and the error reception recovery process of FIG. Then, when an error occurs in the wireless microphone system, the past voice data is utilized, and when utilizing it, attention is paid to the waveform below the frequency that is often contained in the human voice, and the vector below the specific frequency in the final part of the normal voice (predetermined). Based on the amount of change per unit time of It is characterized by making it connect without any discomfort.

The wireless microphone device 100 of FIG. 1 includes a microphone 12, a voice input unit 10, a DSP (digital signal processor) unit 20, a wireless communication unit 30, and an antenna 34.

The voice input unit 10 includes a control circuit 11, a voice signal amplifier 13, an A / D converter 14, and a buffer memory 15. The voice input to the microphone 12 is converted into a voice signal which is an electric signal, and then output to the A / D converter 14 via the voice signal amplifier 13. The A / D converter 14 converts the input analog audio signal into digital audio data, temporarily stores it in the buffer memory 15, and outputs it to the buffer memory 22. The control circuit 11 controls the operations of the A / D converter 14 and the buffer memory 15 in the audio input unit 10 and communicates with the control circuit 21 of the DSP unit 20, in particular, for audio data at predetermined time intervals. When the capture is completed, an interrupt signal indicating the completion of capture is output to the control circuit 21.

The DSP unit 20 includes a control circuit 21, a buffer memory 22, a coding processing unit 23, and a buffer memory 24. The buffer memory 22 temporarily stores the audio data from the buffer memory 15 and then outputs the audio data to the coding processing unit 23. The coding processing unit 23 encodes the voice data read from the buffer memory 22 by using, for example, a voice signal format (see FIG. 3) using a DECT (Digital Enhanced Cordless Telecommunications) communication method which is an asynchronous wireless transmission method. After encoding into audio data, the data is output to the buffer memory 32 via the buffer memory 24. The control circuit 21 controls the operations of the buffer memories 22 and 24 and the coding processing unit 23 in the DSP unit 20, and also communicates with the control circuit 11 of the voice input unit 10 and the control circuit 31 of the wireless communication unit 30, and in particular. , The control process is executed in response to the interrupt signal indicating the completion of capture from the control circuit 11, and when the coding of the voice data at a predetermined time interval is completed, the interrupt signal indicating the completion of coding is transmitted. Output to the control circuit 31.

The wireless communication unit 30 includes a control circuit 31, a buffer memory 32, and a wireless communication circuit 33. The buffer memory 32 temporarily stores the coded audio data from the buffer memory 24 and then outputs the coded audio data to the wireless communication circuit 33. The radio communication circuit 33 generates a radio signal including the coded voice data and radiates it from the antenna 34 by modulating a predetermined radio carrier wave by a predetermined digital modulation method and amplifying the power according to the input coded voice data. do. The control circuit 31 controls the operation of the buffer memory 32 and the wireless communication circuit 33 in the wireless communication unit 30 and communicates with the control circuit 21 of the DSP unit 20, and in particular, indicates that the coding from the control circuit 21 is completed. The control process is executed in response to the incoming signal.

The wireless receiving device 200 of FIG. 2 includes an antenna 42, a wireless communication unit 40, a DSP unit 50, an audio output unit 70, and a speaker 75.

The wireless communication unit 40 includes a control circuit 41, a wireless communication circuit 43, and a buffer memory 44. The wireless communication circuit 43 receives the wireless signal received by the antenna 42 and executes low noise amplification and demodulation processing to reproduce the demodulated encoded audio data and temporarily store it in the buffer memory 44. , Output to the buffer memory 52. The control circuit 41 controls the operation of the wireless communication circuit 43 and the buffer memory 44 in the wireless communication unit 40, and communicates with the control circuit 51 of the DSP unit 50. In particular, when the data acquisition by wireless reception is completed. Outputs an interrupt signal indicating the completion of capture to the control circuit 51 of the DSP unit 50.

The DSP unit 50 includes a control circuit 51, a buffer memory 52, a decoding processing unit 53, an orgate circuit 56, a buffer memory 57, and a complementary processing unit 60. Here, the decoding processing unit 53 includes a decoding calculation unit 54 and a data memory 55. Further, the complement processing unit 60 includes data memories 61 and 63 and a complement calculation unit 62.

The buffer memory 52 temporarily stores the coded voice data from the buffer memory 44, and then outputs the coded voice data to the decoding calculation unit 54. The decoding calculation unit 54 decodes the audio data of the audio signal and outputs the encoded audio data read from the buffer memory 52 to the data memory 61, and outputs the encoded audio data to the buffer memory 57 via the or-gate circuit 56. The complementary calculation unit 62 finally saves the voice sample of FIGS. 5 to 8 described later and executes the vector calculation process (S2) on the voice data temporarily stored in the data memory 61. , Approximate voice data for one predetermined voice block is set as complementary voice data, temporarily stored in the data memory 63, and then output to the buffer memory 57 via the or-gate circuit 56. When an error is received, the or-gate circuit 56 outputs a voice sample of complementary voice data instead of the input voice data as in the error reception process of FIG. 9 described later, and when the error reception is recovered, FIGS. 9 to 9 to By executing the error reception recovery process of FIG. 10, the audio block of the complementary audio data is attenuated, the audio block of the attenuated complementary audio data is faded out, and the audio block of the normally received audio data is faded in. Executes the logical sum processing of signal data. The control circuit 51 controls the operations of the buffer memory 52, the decoding processing unit 53, the ore gate circuit 56, the buffer memory 57, and the complementary processing unit 60 in the DSP unit 50, and also controls the control circuit 41 and the audio output unit of the wireless communication unit 40. It communicates with the control circuit 71 of the 70, and in particular, executes the control process in response to an interrupt signal indicating the completion of the capture from the control circuit 41, and the decoding process of the voice data at a predetermined time interval is completed. At that time, an interrupt signal indicating that decoding is completed is output to the control circuit 71.

The audio output unit 70 includes a control circuit 71, a buffer memory 72, a D / A converter 73, an audio signal amplifier 74, and a speaker 75. The buffer memory 72 temporarily stores the audio data output from the buffer memory 57, and then outputs the audio data to the D / A converter 73. The D / A converter 73 D / A-converts the input audio data into an analog audio signal and then outputs the input audio data to the speaker 75 via the audio signal amplifier 74 to output the audio of the audio signal from the speaker 75. The control circuit 71 controls the operations of the buffer memory 72 and the D / A converter 73 in the audio output unit 70, and communicates with the control circuit 51. In particular, an interrupt signal indicating the completion of capture from the control circuit 41. The control process is executed in response to.

FIG. 3 is a diagram showing an example of a signal format for transmitting audio signal data used in the wireless microphone device 100 of FIG. 1 and the wireless receiving device 200 of FIG. In this embodiment, as described above, for example, a voice signal transmission method using a DECT (Digital Enhanced Cordless Telecommunications) communication method, which is an asynchronous wireless transmission method, is used.

The DECT communication system constitutes an autonomous decentralized wireless access system using FDMA (Frequency Division Multiple Access) and TDD (Time Division Duplex) / TDMA (Time Division Multiple Access). A wireless microphone system is composed of a microphone device 100 and a wireless receiver 200 which is a master unit. Hereinafter, the time slot is abbreviated as "slot". A wireless signal is transmitted and received between the wireless receiving device 200 and the wireless microphone device 100 using a predetermined number (for example, n) of slots determined according to a communication standard for each frame period. When the communication standard is the DECT communication method, one frame period corresponds to 10 ms, and is composed of, for example, n = 24 slots (that is, 12 slots for downlink and 12 slots for uplink).

In wireless communication using the DECT communication method (hereinafter referred to as "DECT communication"), slots S0 to S11 for downlink are generally used for communication from the wireless receiving device 200 to the wireless microphone device 100. .. The uplink slots S12 to S23 are used for communication from the wireless microphone device 100 to the wireless receiving device 200. In the communication between the wireless receiving device 200 and the wireless microphone device 100, slots having a positional relationship of 5 ms apart corresponding to 1/2 cycle, such as slot S0 and slot S12, slot S1 and slot S13, are combined. Used (in pair slots). This pair slot constitutes one channel (for example, a control channel for transmitting and receiving control information, a communication channel for transmitting and receiving audio signals).

Further, of the 12 slots in which the wireless receiver 200 transmits to the wireless microphone device 100, at least one slot (for example, slot S0) is a control signal including control information from the wireless receiver 200 to the wireless microphone device 100. It is a control slot for sending. The control signal is transmitted from the wireless receiver 200 to each wireless microphone device 100 using one of the predetermined number of slots constituting one frame period. If radio wave interference occurs during transmission of a control signal from the wireless receiver 200 to the wireless microphone device 100, an empty slot (in other words, an unused slot) may be used as the control slot.

In FIG. 3, for example, when radio wave interference or the like occurs in slot S0, the wireless receiver 200 switches the control slot from slot S0 to another vacant slot (for example, a slot for switching described later) for use. You may. In conjunction with this, the response slot for the control slot (that is, the slot used for responding to the control slot and used for transmission from the wireless microphone device 100 to the wireless receiving device 200) is vacant from slot S12. It is changed to a slot (for example, a slot for switching). In this way, the wireless receiver 200 operates a slot used as a control channel or a communication channel for each frame period of DECT communication according to the radio wave condition between the wireless receiver 200 and the wireless microphone device 100. To decide. For example, in a device such as a cordless phone, the wireless receiving device 200 is the transmitting side in the first half slots S0 to S11, the wireless microphone device 100 is the receiving side, and the wireless receiving device 200 is in the latter half slots S12 to S23. Is the receiving side, and the wireless microphone device 100 is the transmitting side.

On the other hand, in the wireless microphone system according to the present embodiment, the wireless receiving device 200 receives the audio signal transmitted from the wireless microphone device 100. Further, the wireless receiving device 200 may transmit a control signal to the wireless microphone device 100 once during one frame period. Therefore, in the present embodiment, the wireless receiving device 200 uses slots S0 to S11 so that the slots S0 to S11 in the first half can be used as slots (communication slots) for uplink in which the wireless microphone device 100 is the transmitting side. Determine dynamically.

For example, the wireless receiving device 200 determines the slot S0 within one frame period as a control channel for transmitting the control signal, and transmits the control signal to the wireless microphone device 100 through this control channel. The control information included in the control signal includes, for example, system information, slot information, and carrier information. Specifically, the control information includes, for example, the identification information of the wireless microphone device 100 which is a carrier and the communication partner using the slot, the identification information of the carrier and the slot, the busy state of each slot, and the designation of available empty slots. , The number of connected microphone slave units, the wireless error status of the master unit, slot switching due to wireless interference, etc. are included.

Each slot constituting one frame of DECT communication is 416.67 μs (= 1).
It is defined by a time width of 0 ms / 24), and specifically, as shown in FIG. 3, a "synchronous signal field", a control bit field "A field", and a data bit field "B field". , An "X / Z field" such as a CRC field, and a guard space. The "synchronization signal field" includes fixed data composed of a data string for bit synchronization and a data string for slot synchronization. The "A field" includes the control signal described above. When the amount of control information contained in the control signal is large, for example, not only the control bit field but also a part of the area of the data bit field may be used. The "X / Z field" includes a CRC (Cyclic Redundancy Check) code calculated based on a data string of the control bit field, and is used for detecting a transmission error in the control bit field. Data bit fields are used for voice communication.

FIG. 4 is a waveform diagram showing a method of detecting similar parts of a signal waveform in the audio signal voltage of the wireless receiver 200 of FIG.

In the wireless microphone system according to the present embodiment, past voice data is utilized when an error occurs in the wireless receiving device 200. When utilizing it, in order to pay attention to the waveform below the frequency that is often contained in the human voice, for example, low-pass filtering is performed using a low-pass filter with a cutoff frequency of 7 kHz, and each audio block of a normal audio signal (for example, 2). One subframe of .5 ms, where one frame is composed of four subframes) per vector below a specific frequency (shown in FIG. 4 for a predetermined unit time (for example, 1/7000 s)). Based on the amount of change in the audio signal voltage), identify similar parts of the past audio data (parts in the range between, for example, plus 5 to 8 levels and minus 5 to 8 levels from the voice signal voltage indicated by the vector). , Align the amplitude of the audio data including the high frequency part, and connect the audio signal of the past audio data to the current audio data. In the normal recovery process from error reception, the playback of past audio data and the normal audio data are crossfaded and connected without any discomfort.

In the present embodiment, in order to suppress noise and sound omission when a communication error occurs, voice data for, for example, 10 ms immediately before is stored, and when an error occurs, it is repeatedly reproduced to avoid sound omission. Specifically, when an error occurs, the absolute value and vector of the final part of each voice block are held, a connectable part is selected from the voice data for the immediately preceding 10 ms, and the selected complementary voice data is used. Complements until the connection is restored.

Hereinafter, the voice data reception process in the wireless receiving device 200 will be described in detail using the control processing flow of FIGS. 5 to 10.

FIG. 5 is a flowchart showing a normal reception process executed by the DSP (digital signal processor) unit 50 of the wireless reception device 200 of FIG.

In step S1 of FIG. 5, the input audio data is decoded, and "save of audio sample and vector calculation processing" (FIG. 6) is executed in step S2, and then the audio sample of the audio data is output in step S3. , Return to step S1.

FIG. 6 is a flowchart showing the saving of the audio sample and the vector calculation process (S2), which are the subroutines of FIG.

In step S11 of FIG. 6, the voice sample is stored in the data memory 55, the “vector calculation process of the voice sample” (FIG. 7) is executed in step S12, and then the voice sample saved in step S13 is received as a predetermined reception unit. In step S14, the audio sample is saved every 4 blocks and the original routine is returned.

FIG. 7 is a flowchart showing the vector calculation process (S12) of the voice sample, which is the subroutine of FIG.

In step S21 of FIG. 7, for example, low-pass filtering having a cutoff frequency of 7 kHz is performed on the voice sample, the vector of the voice sample is calculated in a predetermined vector calculation unit in step S22, and "voice" is performed in step S23. After executing the sample vector saving and complementary voice data search setting process (FIG. 8), the voice sample vector is saved in the data memory 61 for 4 blocks in step S24, and the process returns to the original routine.

FIG. 8 is a flowchart showing the vector saving of the voice sample and the complementary voice data search setting process (S23), which is the subroutine of FIG. 7.

In step S31 of FIG. 8, a similar vector similar to the latest vector is searched for the vector of the stored voice sample, and approximate voice data that is similar to the similar vector searched in step S32 is searched. Next, in step S33, the amplitude of the approximate voice data for one voice block is adjusted so that the amplitude of the approximate voice data and the amplitude of the voice data of the latest vector match, and then in step S34, the adjusted 1 The approximate voice data for the voice block is set as the complementary voice data, saved in the data memory 63, and returned to the original routine.

FIG. 9 is a flowchart showing an error reception process executed by the DSP unit 50 of the wireless reception device 200 of FIG.

In step S41 of FIG. 9, an audio sample of the complementary audio data is used instead of the input audio data, and the stored complementary audio data is used with the amplitude of the audio data before substitution and the entire band that is not filtered through low frequencies. Output so that the signal voltage of is substantially the same. Next, in step S42, after executing the processes of steps S21 to S24, it is determined in step S43 whether or not the error reception is resolved and normal reception is achieved. If NO, the process returns to step S41, while YES. In the case of, the process proceeds to step S44. In step S44, the error reception recovery process (FIG. 10) is executed.

FIG. 10 is a flowchart showing an error reception recovery process, which is a subroutine of FIG.

In step S51 of FIG. 10, the audio block of the complementary audio data is attenuated, and in step S52, the attenuated audio block of the complementary audio data is faded out and the audio block of the normally received audio data is faded in. Next, in step S53, it is determined whether or not the voice block of the complementary voice data has become zero, and if NO, the process returns to step S51, while if YES, the process proceeds to step S54. In step S54, the process returns to the normal reception process of FIG.

As described above, according to the present embodiment, in the wireless receiving device 200 that receives the transmission signal including the voice data of the voice signal transmitted from the wireless microphone device 100, the voice data of the received transmission signal is predetermined. Stores audio data for a plurality of audio blocks corresponding to time (S11 in FIG. 6) (calculates the amount of change per predetermined unit time in the data memory 55 and the final part of the audio data of each stored audio block. Then, the calculated change amount per unit time is searched for the audio data of the similar portion within a predetermined range and stored as the complementary audio data in the second storage unit (FIGS. 7 to 8). When the voice data of the voice signal transmitted from the wireless microphone device 100 is received in error, the stored complementary voice data is substantially matched with the amplitude of the voice data before the replacement instead of the received voice data. (S41 in FIG. 9) The control circuit 51 of the DSP unit 50 is provided. Therefore, even if there is a break in the voice in the wireless receiving device 200, the voice can be reproduced with almost no discomfort in hearing.

Further, when the error reception is recovered, the control circuit 51 of the DSP unit 50 attenuates the output complementary audio data and fades out, and outputs the audio data so as to fade in the normally received audio data. The reception recovery process is executed (S51 to S52 in FIG. 10). Therefore, even if there is a break in the sound of the wireless receiving device 200, the sound can be reproduced with almost no sense of discomfort in the auditory sense.

Further, the control circuit 51 of the DSP unit 50 executes the error reception recovery process until the audio block of the stored complementary audio data becomes zero, and then returns to the normal reception process (S53 to S54 in FIG. 10). As a result, it is possible to return to normal reception after recovering from error reception.

(Modification example)
In the above embodiment, the or-gate circuit 56 attenuates the audio block of the complementary audio data, fades out the audio block of the attenuated complementary audio data, and fades in the audio block of the normally received audio data. Is executing the logical sum processing of. However, the present disclosure is not limited to this, and in particular, the audio block of the recovered audio data may be reproduced instead of the audio block of the complementary audio data without fading out and fading in.

In the above embodiment, low-frequency passage filtering is executed in the vector calculation processing of the audio sample of FIG. 7, but the present disclosure is not limited to this, and when the audio sample has characteristics over all frequencies, the low-frequency range is executed. It is not necessary to perform pass filtering.

In the above embodiment, for example, a wireless communication method which is a DECT communication method is used, but the present disclosure is not limited to this, and other wireless communication methods may be used.

In the above embodiments, the present invention is applied to a wireless communication method for communicating using a transmission signal which is a wireless signal, but the present disclosure is not limited to this, and a transmission signal which is a wired signal such as an optical fiber cable or a coaxial cable is applied. It can also be applied to a wired communication method for communicating using the above, and may be applied to a voice signal transmission system or the like.

As described above, an embodiment has been described as an example of the technique in the present disclosure. To that end, the accompanying drawings and detailed description are provided.

Therefore, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above technology. Can also be included. Therefore, the fact that those non-essential components are described in the accompanying drawings and detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent scope thereof.

As described in detail above, according to the present disclosure, an audio signal receiving device capable of reproducing audio with almost no auditory discomfort even if the audio signal receiving device has a break in the audio, and the audio signal receiving device. It is possible to provide an audio signal transmission system equipped with. The voice signal receiving device of the present disclosure includes, for example, an audio device such as a wireless microphone device and a television device, a receiving device that receives a signal including voice data transmitted from a personal computer, and a voice signal transmission system using the receiving device. Can be applied to.

10 Audio input unit 11 Control circuit 12 Microphone 13 Audio signal amplifier 14 A / D converter 15 Buffer memory 20 DSP unit 21 Control circuit 22 Buffer memory 23 Coding processing unit 24 Buffer memory 30 Wireless communication unit 31 Control circuit 32 Buffer memory 33 Wireless communication circuit 34 Antenna 40 Wireless communication unit 41 Control circuit 42 Antenna 43 Wireless communication circuit 44 Buffer memory 50 DSP unit 51 Control circuit 52 Buffer memory 53 Decoding processing unit 54 Decoding calculation unit 55 Data memory 56 Eargate circuit 57 Buffer memory 60 Complementary processing unit 61 Data memory 62 Complementary calculation unit 63 Data memory 70 Audio output unit 71 Control circuit 72 Buffer memory 73 D / A converter 74 Audio signal amplifier 75 Speaker 100 Wireless microphone device 200 Wireless receiver

Claims (6)

An audio signal receiving device that receives a transmission signal including audio data of an audio signal transmitted from an audio signal transmitting device.
A first storage unit that stores the voice data of a plurality of voice blocks corresponding to a predetermined time in the voice data of the received transmission signal, and a first storage unit.
In the final part of the voice data of each stored voice block, the amount of change per unit time is calculated, and the voice data of similar parts where the calculated amount of change per unit time is within a predetermined range is searched. Complementary processing unit that stores the complementary voice data in the second storage unit,
When the voice data of the voice signal transmitted from the voice signal transmitting device is received in error, the stored complementary voice data is substantially matched with the amplitude of the voice data before substitution instead of the received voice data. The control unit that outputs to
An audio signal receiver comprising. When the error reception is recovered, the control unit attenuates the complementary voice data to be output and fades out, and executes an error reception recovery process for outputting the voice data so as to fade in the normally received voice data. ,
The audio signal receiving device according to claim 1. The control unit executes the error reception recovery process until the voice block of the stored complementary voice data becomes zero, and then returns to the normal reception process.
The audio signal receiving device according to claim 2. The audio signal receiving device receives audio data in frame units composed of a plurality of subframes, and receives audio data.
Each audio block corresponds to each subframe.
The audio signal receiving device according to any one of claims 1 to 3. An audio signal transmission device that transmits a transmission signal including audio data of an audio signal,
The audio signal receiving device according to any one of claims 1 to 4 is provided.
Audio signal transmission system. The transmitted signal is a wireless signal,
The audio signal transmission system according to claim 5.

Images