KR100869529B1 - Method for transferring audio data without disconnection in a wireless audio system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of seamlessly delivering audio data 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

According to the present invention, in order to reduce audio data loss due to interference or various communication failures in transmitting audio data wirelessly in a wireless audio (microphone) system, audio data is cut off for duplication of an appropriate amount of audio data. It is an object of the present invention to provide a computer-readable recording medium having a method of delivering the same, and a program for realizing the method.

3. Summary of Solution to Invention

The present invention provides a method of seamlessly delivering audio data in a wireless audio (microphone) system, comprising: dividing audio data into a predetermined length and managing each divided audio information in a packet unit; Recognizing the number of repetitive transmissions of respective audio information in the wireless microphone transmitter; And the wireless microphone transmitter transmits the audio data to at least one wireless microphone receiver in real time by varying the quality of the corresponding audio information according to the number of repetitive transmissions. 'High audio information' increases the amount of data and has a high number of repetitive transmissions, and thus, 'audio information having low utilization rate at the present time' includes an audio information transmission step of transmitting a reduced amount of data.

4. Important uses of the invention

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

Wireless Audio, Microphone, Repeated Transmission, Communication Failure, Latency, Audio Dropout

Description

How to transfer audio data seamlessly in a wireless audio system {Method for transferring audio data without disconnection 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 transmitter for transmitting audio data without interruption in a wireless audio system according to the present invention;

3 is a flowchart illustrating an operation of a receiving apparatus for delivering audio data without interruption 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

16 output unit 20 receiver

23: digital-to-analog converter (DAC) 24: audio output (speakers)

The present invention relates to a method of seamlessly delivering audio data in a wireless audio (microphone) system, and to a computer-readable recording medium having recorded thereon a program for realizing the method. The present invention relates to a method of redundantly transmitting an appropriate amount of audio data and to a computer-readable recording medium having recorded thereon a program for realizing the method, in order to reduce audio data interruption due to interference or various communication failures.

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 recovered even if the data is damaged. The information contained in the header is used to restore and output 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.

Such a system is often used in a noisy place when traveling in a group, and in particular, a one-way broadcast (one-way broadcast) does not allow voice communication (two-way communication) between a transmitter and a receiver regardless of a receiver's situation. In the transmitter, it is difficult to know the state of the receiver. Similar cases include simultaneous interpretation, multi-channel broadcasting on board, and wireless transmission of descriptions in art galleries and museums.

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 order to reduce audio data interruption due to interference or various communication failures in transmitting audio data wirelessly in a wireless audio (microphone) system, an appropriate amount of audio data It is an object of the present invention to provide a method of seamlessly transferring audio data for redundant transmission of the data, and a computer-readable recording medium having recorded thereon a program for realizing the method.

Another object of the present invention is to provide a method of seamlessly delivering audio data to achieve bidirectional communication by exchanging information between transmitting and receiving devices in the wireless audio (microphone) system.

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.

According to an aspect of the present invention, there is provided a method of seamlessly delivering audio data in a wireless audio (microphone) system, the method comprising: dividing audio data into a predetermined length and managing each divided audio information in packet units; Recognizing the number of repetitive transmissions of respective audio information in the wireless microphone transmitter; And the wireless microphone transmitter transmits the audio data to at least one wireless microphone receiver in real time by varying the quality of the corresponding audio information according to the number of repetitive transmissions. 'High audio information' increases the amount of data and has a high number of repetitive transmissions, and thus, 'audio information having low utilization frequency at the present time' includes an audio information transmitting step of reducing and transmitting the amount of data.

On the other hand, the present invention, in the wireless audio (microphone) system having a processor for transmitting audio data seamlessly, the function of dividing the audio data into a predetermined length, and manages each divided audio information in packet units; A function of recognizing the number of times of repetitive transmission of each audio information in the wireless microphone transmitter; And the wireless microphone transmitter transmits the audio data to at least one wireless microphone receiver in real time by varying the quality of the corresponding audio information according to the number of repetitive transmissions. 'High audio information' increases the amount of data and the high frequency of repetitive transmission increases the 'low frequency information at the present time', which provides a computer-readable recording medium that records a program for realizing a function of reducing the amount of data. do.

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.

Here, a plurality of wireless microphone receivers 20 may be linked to one wireless microphone transmitter 10.

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 converter (ADC) 12 and converts it into a digital signal. 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 a maximum of eight pieces of audio information with a length of 1 ms, the wireless microphone transmitter 10 manages nine pieces of audio information including the currently stored audio information.

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.

Here, the number of audio information n of the wireless microphone transmitter 10 should be equal to or greater than the number of audio information n of the wireless microphone receiver 20.

In particular, the wireless microphone transmitter 10 transmits n pieces of audio information to the wireless microphone receiver 20 without the request of the wireless microphone receiver 20. That is, the current audio information P0 is transmitted to the wireless microphone receiver 20 by n times without the request of the wireless microphone receiver 20. For example, when managing up to eight pieces of audio information with a length of 1ms, the wireless microphone transmitter 10 transmits P0 to the eighth wireless microphone receiver 20. In this way, each audio information is transmitted to the wireless microphone receiver 20 by n times (i.e., all audio information is transmitted by n times), each time being reversed (backwarded). In this way, even if a communication is interrupted or a failure occurs, and the previous audio information is not received, the communication failure can be avoided by receiving in the next communication.

However, interference or 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 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 when this time is excessively increased, inconvenience due to the transmission delay is felt. 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 transmitter 10 and the receiver 20 adjust and transmit the number of audio information (n) and the number of audio buffers (n-2) except the basic buffer to be managed according to the degree of communication failure. Delays and communication obstacles can be properly overcome. Of course, as described above, the number of audio information n of the wireless microphone transmitter 10 should be equal to or greater than the number of audio information n of the wireless microphone receiver 20.

The wireless microphone receiver 20 does not need to request audio information, and the wireless microphone transmitter 10 manages a maximum amount of audio information (audio information of 1 ms in length up to 1 ms regardless of a communication failure state). , Including the current audio information P0 The previous audio information (P0 ~ P7) is appropriately adjusted to a limited size and transmitted to the wireless microphone receiver 20. Therefore, the wireless microphone transmitter 10 transmits a certain amount of audio information regardless of a communication failure state (all audio information is transmitted n times), so that the plurality of wireless microphone receivers 20 can receive the audio information. To be able. In this case, a method of reducing the amount of audio data may be considered as a method of compressing more or reducing a BPS, but the sound quality of the audio may be improved by transmitting such a large amount of audio information from the wireless microphone transmitter 10. Degradation is difficult to avoid.

Accordingly, the wireless microphone transmitter 10 maintains the quality of sound quality by transmitting the latest audio information in a higher ratio and the older audio information in a lower ratio than transmitting n audio information at the same ratio. . This means that the most recent audio information is frequently used (because it is unlikely that audio information with a small number of repetitive transmissions has already been transmitted normally before), thus increasing the amount of data and the old audio information. Since the utilization is low (audio information with a high number of repeated transmissions is likely to be transmitted normally, it is considered that the utilization is low at the present time). As a result, the low frequency of repetitive transmission increases the amount of data in the 'high frequency of audio information' at the present time, and the high frequency of repeated transmission reduces the amount of data in the 'high frequency of audio information' at the present time, thus reducing the amount of data. By transmitting to the device 20, the quality ratio of the audio information is transmitted according to the number of repetitive transmissions.

That is, the most recent audio information P0 transmits high quality audio information (increasing the amount of data), and the previous audio information (P1-P7) transmits audio information that is somewhat deteriorated by varying the quality rate (reducing the amount of data). send. For example, since the previous audio information P7 has been transmitted 8 times from the latest audio information to the present, it is likely that the previous audio information has been transmitted normally. send. Of course, the previous audio information P6, P5, ..., P1 transmits audio information having a higher quality rate than P7 because the number of repetitive transmissions is smaller than that of P7. Therefore, the audio information is transmitted by varying the quality rate according to the number of repetitive transmissions.

However, the present invention is not limited thereto, and the latest audio information is 100% quality, audio information repeatedly transmitted one to three times is 50% quality, four times or more is 10% quality, and the like. May be grouped to determine the quality rate of the transmitted audio information.

As described above, if the quality of the audio information is repeatedly transmitted in the wireless microphone transmitter 10 according to the number of times of repetitive transmission, the wireless microphone receiver 20 may maintain a good audio quality. This delays the appropriate amount of audio and can be transmitted using this delayed time.

For example, 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 (n pieces) of audio information including the currently stored audio information and the wireless microphone. The receiving device 20 must also manage up to nine (n) audio information including the 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 1ms for collecting audio information from the wireless microphone, 200us for processing and transmitting the audio information, 300us for preparing the received audio information, 300us for outputting the output information, and 500us for the output waiting time. do. 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.

Although the above example shows the case where one piece of audio information is transmitted, several pieces of audio information can be transmitted simultaneously. The wireless microphone receiver 20 may receive these and selectively use desired audio information. Furthermore, when using multiple communication channels, other audio information may be selected by selecting these channels.

When the wireless microphone transmitter 10 and the receiver 20 are capable of bidirectional communication, the wireless microphone transmitter 10 receives the communication state of the wireless microphone receiver 20 and receives the number of audio information n using the received communication state. Can be changed dynamically.

The wireless microphone receiver 20 dynamically changes the number n of audio information managed by the receiver 20 by using a communication state collected separately from the n audio information received from the wireless microphone transmitter 10. Can be. This can be used to reduce or increase the transmission delay. In this case, the number of audio information n (number of managed audio information) of the wireless microphone receiver 20 is smaller than the number of audio information n (number of managed audio information) of the wireless microphone transmitter 10. same.

In this case, there is a separate communication time in addition to the time for transmitting audio information, or it may be used, or the audio transmission may be stopped and such communication may be performed. At this time, in the latter case, transmission of the audio information is temporarily stopped, but can be recovered in the next communication.

If the communication condition is good and the communication to reduce the delay time (reducing n) is less likely to occur, the communication failure is caused by this communication when the communication state is bad and the delay time is increased (increase n). There is a possibility to increase.

The wireless microphone receiver 20 may know a case away from the wireless microphone transmitter 10 from a communication state where audio information is received, and the wireless microphone transmitter 10 periodically checks each wireless microphone receiver 20. ) Can respond to determine the status of the wireless communication or to collect various information. In this way, the wireless microphone transmitter 10 may detect in real time when some of the wireless microphone receiver 20 is out of the communication distance. In this case, the wireless microphone transmitter 10 may display or alert a situation in which communication is lost through the output unit 16. Of course, this requires bidirectional communication between the wireless microphone transmitter 10 and the plurality of wireless microphone receivers 20.

As such, the wireless microphone transmitter 10 may perform bidirectional communication with the requested receiver 20 at the request of the wireless microphone receiver 20, and both sides may exchange voices in the above-described manner. In this case, the wireless microphone transmitter 10 may communicate according to the request order of the wireless microphone receiver 20.

For two-way communication, the wireless microphone transmitter 10 and the receiver 20 must have both a transmission function and a reception function (referred to as a 'wireless microphone transceiver' for convenience), and information exchange between a plurality of wireless microphone transceivers is performed. In this case, when one wireless microphone transceiver is transmitting, the other wireless microphone transceiver can transmit audio information quickly in a manner of receiving the wireless microphone transceiver. In this case, the plurality of wireless microphone transceivers should send a command to switch to another wireless microphone transceiver in a reception state at the request of the user in order to determine one wireless microphone transceiver to be transmitted. When the status change command is transmitted, the identification signal or sound may be expressed differently for each type so that the user pays attention to the wireless microphone transceiver.

In addition, the relay can be relayed by a repeater as a method for communicating over a long distance or for two or more independent communication networks to communicate with each other. In this case, the repeater (corresponding to the wireless microphone receiver 20) transmits the information received from one side to the other, and may minimize the transmission time by immediately transmitting the received information, but if the degree of communication failure is severe, In this way, communication delay may be overcome by delaying a part of audio information.

In this case, if n is 4, since the repeater retransmits the received audio information, if there were 8 delays before, all 12 buffers should be managed as if 12 delays occurred. In other words, the audio information of eight pieces P4 to P11 before four pieces P0 to P3 is transmitted immediately.

2 and 3 are flowcharts illustrating an exemplary operation of a transmitting and receiving apparatus for seamlessly delivering audio data 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 with a length of 1 ms) (manage n audio information), and use the recently collected audio information as P0, and in order of 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. For example, 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 the currently stored audio information, and the wireless microphone receiver 20 currently Nine pieces of audio information are managed, including the audio information being output.

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 includes nine pieces (n being natural numbers) including audio information currently stored. Audio information must be managed, and the wireless microphone receiver 20 must also manage 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. Of course, if the length of the audio information is reduced to 0.5ms, the delay is reduced to 1/2.

At this time, the wireless microphone transmitter 10 collects new audio information 201 without requesting the wireless microphone receiver 20 and transmits n pieces of audio information to the wireless microphone receiver 20 (202). That is, the current audio information P0 is transmitted to the wireless microphone receiver 20 n times (including the current transmission n-1 times in the future) without the request of the wireless microphone receiver 20, and is transmitted once. N audio information is transmitted. That is, in the case of managing up to eight pieces of audio information with a length of 1ms, the wireless microphone transmitter 10 transmits P0 to the eighth wireless microphone receiver 20. In this manner, each piece of audio information is transmitted to the wireless microphone receiver 20 n times (that is, all audio information is repeatedly transmitted n times), and n pieces of audio information are transmitted every time (202). .

In this case, when interference or failure occurs continuously, the wireless microphone transmitter 10 and the receiver 20 manage the number of audio information (n) and the number of audio buffers excluding the basic buffer according to the communication failure degree ( By adjusting n-2), transmission delay and communication failure can be properly overcome. However, the number of audio information n of the wireless microphone transmitter 10 should be equal to or greater than the number of audio information n of the wireless microphone receiver 20.

However, above all, in order to seamlessly transmit audio information, rather than transmitting n pieces of audio information at the same rate in the wireless microphone transmitter 10, recent audio information P0 increases the ratio and old audio information (P1 ~). Pn) is transmitted in a way to lower the ratio, it is possible to maintain the quality of the audio sound quality in the wireless microphone receiver 20. This means that the most recent audio information has a high utilization frequency, thereby increasing the data volume, while the old audio information has a low utilization frequency, so the data volume is reduced.

For example, the most recent high frequency audio information P0 transmits high quality audio information (increasing the amount of data), while the low frequency low frequency audio information (P1 to P7) has a slightly lower quality audio information. Are transmitted with different quality rates (reduced data volume). That is, since the previous audio information P7 has been transmitted twice since the latest audio information from the past to the present, it is highly likely that the previous audio information P7 has already been transmitted normally. Send it. Of course, the previous audio information P6, P5, ..., P1 transmits the audio information of higher quality than P7 because there are fewer repeat transmission times than P7. Accordingly, the wireless microphone transmitter 10 transmits n pieces of audio information to the wireless microphone receiver 20 by varying the quality ratio according to the number of repetitive transmissions.

As described above, when the wireless microphone transmitter 10 repeatedly transmits different quality ratios of audio information according to the number of repetitive transmissions (202), the wireless microphone receiver 20 receives the audio information (301) and receives the received audio. In the information, audio information which has not previously existed is filled in (302), and when the order is reached, the audio information is output to the outside (303).

By doing so, the wireless microphone receiver 20 can maintain a good audio quality.

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.

In the present invention as described above, even when there is a communication failure, the audio information can be transmitted to a plurality of wireless microphone receivers by minimizing a transmission delay, and when a lot of communication failures occur, the transmission delay can be increased to transmit high quality audio in real time. It has an effect.

Claims (9)

delete In a method of seamlessly delivering audio data in a wireless audio (microphone) system, Dividing the audio data into predetermined lengths and managing the divided audio information in packet units; Recognizing the number of repetitive transmissions of respective audio information in the wireless microphone transmitter; And The wireless microphone transmitter transmits the audio data to the at least one wireless microphone receiver in real time by varying the quality of the corresponding audio information according to the number of repetitive transmissions, but the number of repetitive transmissions is low. 'Audio information' increases the amount of data and has a high number of repetitive transmissions. Method of seamlessly delivering audio data in a wireless audio system comprising a. The method of claim 2, The apparatus for transmitting a wireless microphone manages the divided audio information n (where n is a natural number) including audio information currently stored, The at least one wireless microphone receiver manages each of the divided pieces of audio information, including audio information currently being output, n (where n is a natural number) and starts from 0 (n-2) except two basic buffers. A method of seamlessly delivering audio data in a wireless audio system, characterized in that it is possible to selectively manage) audio buffers to cope with up to (n-2) communication failures. The method of claim 2 or 3, The wireless microphone transmitter and the at least one wireless microphone receiver, By exchanging information through two-way communication, the number of audio information managed (n) increases if the continuous communication failure increases, and the number of audio information managed (n) decreases when the continuous communication failure decreases. How to seamlessly pass audio data from your system. The method of claim 4, wherein The wireless microphone transmitter, The communication status of each of the wireless microphone receivers can be determined by exchanging information with each other through bidirectional communication with the at least one wireless microphone receiver, and a screen display or a situation in which one wireless microphone receiver is out of the communication area or communication is lost. A method of seamlessly delivering audio data in a wireless audio system, characterized by a beep output. The method of claim 5, wherein Between the wireless microphone transmitter and the at least one wireless microphone receiver, A method of seamlessly delivering audio data in a wireless audio system, characterized in that two-way voice communication is possible at the same time or according to a request order of each wireless microphone receiver. The method of claim 6, One wireless microphone receiver of the at least one wireless microphone receiver, By minimizing the transmission time by immediately transmitting the audio information received from the wireless microphone transmitter to another wireless microphone receiver, or delaying a predetermined portion of the audio information to another wireless microphone receiver to overcome the communication failure A method of seamlessly transmitting audio data in a wireless audio system, characterized in that it has a relay function. The method of claim 4, wherein Each of the at least one wireless microphone receiver, Apart from the audio information received from the wireless microphone transmitter, the number of audio information managed by using the collected communication state (n) can be dynamically changed to reduce or increase the transmission delay. How to seamlessly transfer audio data from your audio system. In order to seamlessly transmit audio data, to a wireless audio (microphone) system having a processor, Dividing audio data into predetermined lengths and managing the divided audio information in packet units; A function of recognizing the number of repetitive transmissions of each audio information in the wireless microphone transmitter; And The wireless microphone transmitter transmits the audio data to the at least one wireless microphone receiver in real time by varying the quality of the corresponding audio information according to the number of repetitive transmissions, but the number of repetitive transmissions is low. 'Audio information' increases the amount of data and the high number of repetitive transmissions increases the 'audio information with low usage frequency at the present time'. A computer-readable recording medium having recorded thereon a program for realizing this.

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