KR100850267B1 - Method for reducing the disconnection of audio data by communication fault in a wireless audio system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of reducing interruption of audio data due to a communication failure in a wireless audio system, and to a computer readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides a method for reducing audio data interruption due to interference or various communication failures in wireless audio (microphone) system, and a computer for recording a program for realizing the method. The purpose is to provide a record medium.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a method of reducing interruption of audio data due to a communication failure in a wireless audio (microphone) system, comprising: dividing audio data into a predetermined length and managing each divided audio information in a packet unit; Requesting, from the wireless microphone receiver, the number and quantity (transmission amount) of audio information insufficient due to a communication failure, including recent audio information, to the wireless microphone transmitter; And during the delay time caused by the selective management of the audio buffer except the default buffer in the wireless microphone receiver, the wireless microphone transmitter transmits the corresponding audio information to the wireless microphone receiver in real time according to the transmission amount, And dividing the insufficient audio information into a plurality of times when a plurality of communication failures occur, and transmitting the divided audio information to the wireless microphone receiver.

4. Important uses of the invention

The present invention is used in a wireless audio (microphone) system and the like.

Wireless Audio, Microphone, Communication Failure, Latency, Audio Lost

Description

Method for reducing the disconnection of audio data by communication fault in a wireless audio system}

1 is an exemplary configuration of a wireless audio (microphone) system to which the present invention is applied;

2 is a flowchart illustrating an operation of a receiving apparatus for reducing interruption of audio data due to a communication failure in a wireless audio system according to the present invention;

3 is a flowchart illustrating an operation of a transmitter for reducing interruption of audio data due to a communication failure in a wireless audio system according to the present invention;

4 is an explanatory diagram showing an original audio (microphone) signal and some lost / damaged audio (microphone) signals used in the present invention.

* Explanation of symbols on the main parts of the drawing

10: transmitting device 11: voice input unit (microphone)

12: analog-to-digital converter (ADC) 13,22: central processing unit

14,21: wireless transceiver 15,25: storage unit

20: receiver 23: digital-to-analog converter (DAC)

24: audio output unit (speakers)

The present invention relates to a method of reducing the interruption of audio data due to a communication failure in a wireless audio (microphone) system, and to a computer readable recording medium recording a program for realizing the method. The present invention relates to a method for reducing the interruption of audio data due to interference or various communication obstacles, and to a computer-readable recording medium having recorded thereon a program for realizing the method.

In general, a wireless audio (microphone) system converts an analog audio (microphone) signal received from an external device into a digital signal (ADC) and wirelessly transmits the signal at a predetermined time interval. It operates by outputting to outside after (DAC). At this time, the transmitter of the wireless audio (microphone) system controls the data transmission speed according to the situation of the receiver (data reception speed, buffer overflow or the like).

Here, in the event of interference (loss / damage) to the audio (microphone) signal due to interference and other reasons, the audio (microphone) data is retransmitted or separate restoration information (audio (microphone) data part transmitted together) Can be restored even if the data is damaged. The information contained in the header is used to restore and output the lost / damaged audio (microphone) data. The recovery method can be divided according to the severity of the failure.

In the case of restoring audio (microphone) data using the restoration information, it is difficult to restore the data when the degree of data damage is severe or data loss occurs. Therefore, when a failure occurs in the wireless communication, and the degree of the failure is small, a method of recovering lost / damaged audio (microphone) data is mainly used by using failure recovery information (restoration information).

However, according to the method of restoring audio (microphone) data using the restoring information, the process of generating and transmitting restoring information and restoring the data using the restoring data additionally involves the overall data throughput (calculated amount) and There was a problem that the amount of transmission increases. This, in turn, leads to an increase in transmission delay.

However, if the degree of failure is severe, a method of recovering lost / damaged audio (microphone) data by retrying communication may be more useful. However, since retrying when real-time communication is required affects the next communication, if the retry is difficult or it is difficult to continuously retry, such as when a continuous failure occurs, such a failure is overcome. Is difficult.

In general, when digitally represented audio data is transmitted through communication, efforts are made to reduce the amount of data as much as possible in order to reduce communication bandwidth. In this way, various codecs have been developed and used, and in order to recover the loss of data due to communication failure, a lot of efforts are made to recover the lost parts based on the already received data rather than retransmission. Done.

That is, in general, the CODEC refers to the audio before and after to improve the compression effect, and even when recovering the loss, it often refers to the audio before and after. However, the reference to the audio before and after improves the compression effect and facilitates the loss recovery. However, the transmission delay of the audio is relatively high, and the loss of the audio causes a difference from the original sound.

As an example of wireless audio (microphone) data transmission, Bluetooth has 79 channels of 1 MHz bandwidth using GFSK (Guassian Frequency Shift Keying) modulation in the 2.4 GHz (2.402 GHz to 2.480 GHz) Industrial Scientific Medical (ISM) band. Frequency hopping spread spectrum technology is used to change the channel by 1600 times per second. This prevents interference and fading and enables robust communication in a noisy wireless section. In addition, a time division duplex (TDD) scheme is used for full duplex transmission. For error correction, 1/3 rate forward error correction (FEC), 2/3 rate FEC, and ARQ (Automatic Repeat Request) are used.

Designed to operate in a noisy radio frequency environment, Bluetooth uses fast recognition and frequency hopping to strengthen the connection. The Bluetooth module avoids interference with other signals by making new frequency hopping after receiving or sending packets. Compared to other systems operating in the same frequency band, Bluetooth uses particularly fast and short packets. This makes Bluetooth stronger than other systems. The small package and fast frequency hopping also limit the impact of home and professional electronic ovens. The use of forward error correction (FEC) limits the impulse with any noise that can occur over long distances. The encoding is optimized for untuned environments.

In terms of Bluetooth wireless transmission, Bluetooth can support one asynchronous channel, three synchronous voice channels simultaneously, or a channel supporting asynchronous data and synchronous voice simultaneously. Each voice channel supports 64kb / s of synchronized connections. The asynchronous channel supports asymmetrical connections of up to 721kb / s (which means transmission in either direction, in which case the return rate is allowed up to 57.6kb / s) and symmetrical connections of 432.6kb / s.

In terms of network topology, a voice channel is a log PCM or CVSD (Continuous Variable Slope Delta Modulation, 1bit / sample compression, lossy CODEC, quantizing the amplitude difference between two samples) to enhance the correlation between adjacent audio samples. It uses a coding scheme and never retransmits a voice packet. The CVSD approach was adopted because of its good handling of missing and damaged voice samples. As a result of experiments measuring how much interference is caused by ambient noise, the voice coded by the CVSD method can be heard quite well even at bit error rates of more than 4%.

As described above, the Bluetooth wireless technology was briefly reviewed. However, Bluetooth wireless technology never retransmits a voice packet if a disturbance (loss / damage) occurs in an audio (microphone) signal for interference and other reasons. That is, it does not use a method of recovering lost / damaged audio (microphone) data by retrying communication.

The present invention has been proposed to solve the above problems, and in transmitting the wireless data wirelessly in a wireless audio (microphone) system, a method and a method for reducing the interruption of audio data due to interference or various communication failures It is an object of the present invention to provide a computer-readable recording medium that records a program for realization.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The present invention for achieving the above object, in a method of reducing the interruption of audio data due to a communication failure in a wireless audio (microphone) system, by dividing the audio data into a predetermined length, and manages each divided audio information in packet units Doing; Requesting, from the wireless microphone receiver, the number and quantity (transmission amount) of audio information insufficient due to a communication failure, including recent audio information, to the wireless microphone transmitter; And during the delay time caused by the selective management of the audio buffer except the default buffer in the wireless microphone receiver, the wireless microphone transmitter transmits the corresponding audio information to the wireless microphone receiver in real time according to the transmission amount, And dividing the insufficient audio information into a plurality of times when a plurality of communication failures occur, and transmitting the divided audio information to the wireless microphone receiver.

On the other hand, the present invention, in order to reduce the interruption of the audio data due to communication failure, in the wireless audio (microphone) system having a processor, the audio data is divided into a predetermined length to manage each divided audio information by packet unit function; Requesting, from the wireless microphone receiver, the number and quantity (transmission amount) of audio information insufficient due to a communication failure, including recent audio information, to the wireless microphone transmitter; And during the delay time caused by the selective management of the audio buffer except the default buffer in the wireless microphone receiver, the wireless microphone transmitter transmits the corresponding audio information to the wireless microphone receiver in real time according to the transmission amount, Provided is a computer readable recording medium having recorded thereon a program for realizing a function of dividing insufficient audio information into a plurality of times and transmitting the insufficient audio information to the wireless microphone receiver in the event of a large number of communication failures.

The present invention is to reduce the interruption of audio data due to interference or various communication failures in transmitting audio (microphone) data wirelessly, by delaying an appropriate amount of audio and retrying communication using this delayed time. The interruption of audio data can be reduced.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a wireless audio (microphone) system to which the present invention is applied.

First of all, the term " lossed / damaged audio (microphone) signal " used in the present invention is " 32 " in contrast to the original audio (microphone) signal 31 before being lost / corrupted, as shown in FIG. This is the case when some audio (microphone) signals are lost or damaged due to communication failure during transmission.

That is, in Fig. 4, " 31 " represents an original audio (microphone) signal before being lost, and " 32 " represents an audio (microphone) signal, partly lost / corrupted due to a communication failure. If some audio (microphone) signals, such as "32", are lost / damaged due to a communication failure during transmission, audio (microphone) noise may occur.

As shown in FIG. 1, the wireless audio (microphone) system includes a wireless microphone transmitter 10 for converting an analog audio (microphone) signal received from the outside into a digital signal (ADC) for wireless transmission and a wireless microphone. In response to receiving an audio (microphone) signal from the transmitter 10, the apparatus may include a wireless microphone receiver 20 for converting the signal into an analog signal and outputting the same.

In particular, the wireless microphone transmitter 10 converts an analog audio (microphone) signal input through the voice input unit (microphone) 11 into an analog signal by the analog-digital conversion unit (ADC) 12. The central processing unit 13 stores the data in the storage unit 15. The wireless transceiver 14 of the wireless microphone transmitter 10 communicates with the wireless microphone receiver 20 and stores audio (microphone) stored in the storage unit 15 in response to a request of the wireless microphone receiver 20. The information is transmitted to the wireless transceiver 20.

Meanwhile, the wireless microphone receiver 20 communicates with the wireless microphone transmitter 10 by using the wireless transceiver 21, requests the audio information from the wireless microphone transmitter 10, and transmits the received audio information to the central processing unit. (22), the central processing unit (22) stores the audio information in the storage unit (25), and when the order is delivered to the digital-to-analog converter (DAC) 23 to the digital-to-analog converter (DAC). In step 23, an analog signal is converted (DAC) and output to the outside through the voice output unit (speaker) 24.

The wireless microphone transmitter 10 and the receiver 20 store audio information (in this case, the audio information is obtained by dividing the audio data into packet units (eg, 1 ms in length)) in the storage units 15 and 25. To manage a certain amount of units (e.g., to manage audio information with a length of 1 ms), and the recently collected audio information is referred to as P0, and P1, P2, P3,... The audio information of n pieces (where n is a natural number) is managed by using P (n-1) as the oldest audio information.

Here, n may be arbitrarily changed in consideration of communication delay time and communication failure.

The wireless microphone transmitter 10 manages n pieces of audio information without a request from the receiver 20. That is, in the case of managing up to eight pieces of audio information with a length of 1ms, the wireless microphone transmitter 10 manages nine pieces of audio information including audio information currently stored.

The wireless microphone receiver 20 also manages n pieces of audio information. That is, in the case of managing a maximum of eight pieces of audio information with a length of 1 ms, the wireless microphone receiver 20 manages nine pieces of audio information including the currently output audio information. In this case, the insufficient audio information is requested to the wireless microphone transmitter 10 to receive the corresponding audio information from the wireless microphone transmitter 10. The number of audio information n (number of managed audio information) of the wireless microphone receiver 20 is smaller than or equal to the number of audio information n (number of managed audio information) of the wireless microphone transmitter 10. .

Typically, the wireless microphone receiver 20 requests the most recent piece of audio information P0 to the wireless microphone transmitter 10, and the wireless microphone transmitter 10 responds thereto. However, when communication or interference occurs in the communication and the previous audio information is not received, several pieces of audio information from the audio information before P0 to the P0 are required.

Such interference or interference may occur continuously, and the wireless microphone transmitter 10 and the receiver 20 may cope with (n-2) consecutive failures. That is, the failure can be dealt with by the number (n-2) of audio buffers selectively managed in addition to the two basic buffers. However, when this number is increased (that is, the number n of audio information to be managed increases and the number of audio buffers to be managed (n-2) increases), the audio input and the radio of the wireless microphone transmitter 10 The time difference between the audio outputs of the microphone receiver 20 becomes long, and if this time is excessively increased, it may cause inconvenience due to the transmission delay. Further, when this number becomes smaller (i.e., the number n of audio information to be managed becomes smaller and the number (n-2) of audio buffers to be managed becomes smaller), more failures than this number occur continuously. Difficult to cope effectively

Accordingly, the wireless microphone receiver 20 may appropriately overcome transmission delay and communication failure by dynamically adjusting the number (n-2) of audio buffers for collecting and managing communication failure information. Of course, at this time, n (number of managed audio information) of the wireless microphone transmitter 10 should be equal to or larger than the maximum size of n (number of managed audio information) of the wireless microphone receiver 20 as described above. .

In this case, the wireless microphone receiver 20 may request all or limited number of audio information required by the wireless microphone transmitter 10, and the wireless microphone transmitter 10 requests from the wireless microphone receiver 20. Audio information is properly adjusted to a limited size and transmitted. In this case, as a method of reducing the amount of audio data than the normal case, a method of compressing more or reducing BPS may be considered.

By the way, normal audio information is transmitted when there is no communication failure, but as the error accumulates, audio information to be transmitted increases, so that normal transmission becomes difficult. In this case, the wireless microphone transmitter 10 reduces the amount of audio information to be appropriately transmitted. Thus, a plurality of audio information can be transmitted. However, it is difficult to avoid this by lowering the audio quality.

Therefore, in the case where a large number of communication failures occur, the sound quality may be greatly reduced by recovering the failure at one time, so that the sound quality degradation may be reduced by dividing several times.

For example, when five communication failures occur in the wireless microphone receiver 20 and the wireless microphone transmitter 10 requests six times of audio information P5 to P0 including the latest audio information P0, Rather than requesting all six audio information (P5-P0) at once, five audio information (P5-P4, P4-P3, P3-P2, P2-P1, P1-P0 (each time wireless microphone transmitter) (10) is added one audio information)) is more advantageous to maintain the sound quality. Of course, if the request is separated more times, the sound quality will be closer to the original sound quality, but if the communication error occurs and accumulates later, it may be difficult to process. Therefore, the audio information is properly considered in consideration of transmission delay and communication error. Should be requested.

That is, in the case of managing up to 8 pieces of audio information with a length of 1ms, the wireless microphone transmitter 10 must manage 9 pieces of audio information including the currently stored audio information and the wireless microphone receiver. (20) also manages up to nine (n) audio information, including audio information currently being output. In this case, the wireless microphone receiver 20 may selectively manage 0 to 7 audio buffers (0 to n-2) in addition to the two default buffers, so that a delay of 0 to 7 ms is a basic delay. Will occur in addition to Although 0 to 7 ms is added to the basic delay according to the number of managed audio buffers (0 to 7), it is possible to cope with 0 to 7 consecutive communication failures.

In this case, the default delay is about 1ms for collecting audio information from the wireless microphone, 200us for processing and transmitting the audio information, 300us for preparing the received audio information, 500us for the output waiting time, and about 2ms. Becomes In addition, if the audio buffer is selectively managed, an additional delay of 1 ms is generated for each managed audio buffer (0 to 7 ms), resulting in a delay of 2 ms to 9 ms as a whole.

If the length of the audio information is reduced to 0.5ms, the default delay is about 1ms, and if the audio buffer is selectively managed, an additional delay of 0.5ms is generated for each managed audio buffer (0 to 3.5ms). In general, there is a delay of 1ms to 4.5ms.

By selectively managing the audio buffers as described above, it is possible to cope with continuous communication failures by the number of managed audio buffers (n-2), and at this time, retrying communication for a delayed time and lost / damaged audio (microphone) data. Can be recovered.

2 and 3 are flowcharts illustrating an operation of an operation of a receiving and transmitting apparatus for reducing interruption of audio data due to a communication failure in a wireless audio system according to the present invention.

The wireless microphone transmitter 10 and the receiver 20 store audio information (in this case, the audio information is obtained by dividing the audio data into packet units (eg, 1 ms in length)) in the storage units 15 and 25. To manage a certain amount of units (e.g., manage audio information at a length of 1 ms) (manage n audio information), and use the audio information recently collected as P0, and P1, P2, P3,... N audio information is managed using the oldest audio information as P (n-1). For example, in the case of managing up to eight pieces of audio information with a length of 1 ms, the wireless microphone transmitter 10 manages nine pieces of audio information including the audio information currently stored, and the wireless microphone receiver 20 ) Manages nine audio information including the audio information currently being output.

For example, in the case of managing up to 8 pieces of audio information with a length of 1 ms, the wireless microphone transmitter 10 includes 9 pieces of audio (n pieces (where n is a natural number)) including audio information currently stored. The information must be managed, and the wireless microphone receiver 20 must also manage at least nine (n) audio information including audio information currently being output. In this case, the wireless microphone receiver 20 may selectively manage 0 to 7 audio buffers (0 to n-2) in addition to the two default buffers, so that a delay of 0 to 7 ms is a basic delay. Will occur in addition to Although 0 to 7 ms is added to the basic delay according to the number of managed audio buffers (0 to 7), it is possible to cope with 0 to 7 consecutive communication failures. Of course, if the length of the audio information is reduced to 0.5ms, the delay is reduced to 1/2.

At this time, in a typical case in which a failure does not occur (201), the wireless microphone receiver 20 requests the most recent one audio information P0 to the wireless microphone transmitter 10 (the number and quantity of recent audio information). (202), the wireless microphone transmitter 10 responds to this (302 in FIG. 3).

However, with respect to the audio information insufficient due to a failure 201, the wireless microphone receiver 20 requests the insufficient audio information to the wireless microphone transmitter 10 (request the number and quantity of the audio information at the time of the first failure). 203 receives corresponding audio information from the wireless microphone transmitter 10 (302 in FIG. 3). That is, when the previous audio information is not received due to interference or failure in communication, a plurality of audio information from P0 to P0 is requested (203).

Thereafter, the wireless microphone receiver 20 waits for a response from the wireless microphone transmitter 10 (204), stores the communication failure information when a failure occurs (206), and outputs the received audio information when normally received. (207).

In the above, interference or communication failure may occur continuously, and the wireless microphone transmitter 10 and the receiver 20 may cope with (n-2) consecutive failures. That is, the failure can be dealt with by the number (n-2) of audio buffers selectively managed in addition to the two basic buffers. However, when the number n of audio information managed by the wireless microphone receiver 20 increases and the number n-2 of audio buffers managed by the wireless microphone receiver 20 increases, the audio input and the wireless input of the wireless microphone transmitter 10 The time difference between the audio outputs of the microphone receiver 20 becomes long, and when this time is excessively increased, inconvenience due to the transmission delay is felt. In addition, when the number n of audio informations managed by the wireless microphone receiver 20 decreases and the number n-2 of audio buffers managed by the wireless microphone receiver 20 decreases, it is effective when more than this number of failures occur continuously. Difficult to cope

Therefore, the wireless microphone receiver 20 needs to dynamically adjust the number (n-2) of audio buffers for collecting and managing communication failure information. That is, the number of audio buffers to be managed increases if the continuous communication failure increases, and the number of audio buffers to be managed when the continuous communication failure decreases, so that transmission delay and communication failure can be properly overcome.

In the above, when the wireless microphone receiver 20 requests insufficient audio information due to a communication failure to the transmitter 10 (203), the wireless microphone receiver 20 receives all or limited number of audio information required. As long as the wireless microphone transmitter 10 can be requested. On the other hand, the wireless microphone transmitter 10 adjusts and transmits the audio information requested by the wireless microphone receiver 20 to a limited size as appropriate (301 and 302). In this case, as a method of reducing the amount of audio data than the normal case, a method of compressing more or reducing BPS may be considered.

By the way, as described above, normal audio information is transmitted when there is no communication failure, but as the error accumulates, audio information to be transmitted increases, so that normal transmission becomes difficult. In this case, the wireless microphone transmitter 10 transmits audio information to be transmitted. By appropriately reducing the amount of transmission, a large amount of audio information can be transmitted. However, in the case where a large number of communication failures occur, the sound quality can be greatly reduced by recovering the failure at one time. Therefore, it is desirable to reduce the sound quality degradation by dividing the data several times (dividing and transmitting). That is, when there are five communication failures in the wireless microphone receiver 20 and request the wireless microphone transmitter 10 for six times audio information P5 to P0 including the latest audio information P0 (203). , Rather than requesting all six audio information (P5-P0) at once, request five audio information (P5-P4, P4-P3, P3-P2, P2-P1, P1-P0) two by two, In response to this, the wireless microphone transmitter 10 divides the data into two pieces and transmits them to the wireless microphone receiver 20 five times (302).

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention can reduce the interruption of audio by delaying an appropriate amount of audio and retrying communication using the delayed time. In particular, when the communication failure is small, the transmission delay is minimized, and communication failure occurs a lot. In this case, it is possible to transmit high quality audio in real time by increasing transmission delay.

Claims (7)

In a method of reducing the interruption of audio data due to communication failure in a wireless audio (microphone) system, Dividing the audio data into predetermined lengths and managing the divided audio information in packet units; Requesting, from the wireless microphone receiver, the number and quantity (transmission amount) of audio information insufficient due to a communication failure, including recent audio information, to the wireless microphone transmitter; And During the delay time caused by the selective management of the audio buffer except the default buffer in the wireless microphone receiver, the wireless microphone transmitter transmits the corresponding audio information to the wireless microphone receiver in real time according to the amount of transmission. Splitting insufficient audio information into a plurality of times when a communication failure occurs and transmitting it to the wireless microphone receiver; How to reduce the interruption of audio data due to communication failure in a wireless audio system comprising a. The method of claim 1, The wireless microphone transmitter, A method of reducing audio data interruption due to communication failure in a wireless audio system, characterized in that for managing each of the divided audio information, including the currently stored audio information, n is a natural number. The method of claim 2, The wireless microphone receiver, Each of the divided audio information including the currently output audio information is managed n (where n is a natural number), and 0 to (n-2) audio buffers are selectively managed except for two basic buffers. can cope with (n-2) communication errors, If the continuous communication failure increases, the number of audio buffers to be managed is increased (n-2), and if the continuous communication failure decreases, the number of audio buffers to be managed (n-2) is reduced. How to reduce the interruption of audio data caused. delete delete The method according to any one of claims 1 to 3, The wireless microphone transmitting and receiving device, In a wireless audio system, the number of audio information to be managed increases if the continuous communication failure increases, and the number of audio information to be managed decreases when the communication failure decreases. How to reduce the break. In order to reduce the interruption of audio data due to communication failure, in a wireless audio (microphone) system having a processor, Dividing audio data into predetermined lengths and managing the divided audio information in packet units; Requesting, from the wireless microphone receiver, the number and quantity (transmission amount) of audio information insufficient due to a communication failure, including recent audio information, to the wireless microphone transmitter; And During the delay time caused by the selective management of the audio buffer except the default buffer in the wireless microphone receiver, the wireless microphone transmitter transmits the corresponding audio information to the wireless microphone receiver in real time according to the amount of transmission. In the event of a communication failure, the insufficient audio information is divided into multiple times and transmitted to the wireless microphone receiver. A computer-readable recording medium having recorded thereon a program for realizing this.

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