CN101807946A - 2.4G wireless audio device working method - Google Patents

Abstract

The invention relates to the technical field of wireless audio transmission, in particular to a working method of a 2.4G wireless audio device, which can enable a wireless audio sending module to carry out wireless audio transmission on four wireless audio receiving modules, wherein the 2.4G wireless audio device at least comprises a wireless audio sending module and a first, a second, a third and a fourth wireless audio receiving modules, and the wireless audio sending module and the four wireless audio receiving modules work according to a transmitting-receiving-protocol. The invention realizes that one wireless audio sending module carries out wireless audio transmission on four wireless audio receiving modules, can be applied to various devices for generating audio streams, and can also realize that one end of the wireless audio receiving module controls the playing action of the player.

Description

2.4G the method for work of wireless audio device

Technical field

The present invention relates to the ANTENN AUDIO transmission technique field, particularly a kind of method of work of 2.4G wireless audio device can make an ANTENN AUDIO sending module that four ANTENN AUDIO receiver modules are carried out the ANTENN AUDIO transmission.

Background technology

Along with the continuous development of the audio frequency and video technology and the communication technology, and the release of various video/audio service, people continually develop out variety of way with conveniently transmission of video and audio-frequency information.For example, release along with the high definition television service, people hanker after making up the household audio and video system of 5.1 sound channels or 7.1 sound channels to obtain more perfectly seeing and hearing enjoyment, in such household audio and video system, disposed 6 or 8 loud speakers altogether, wherein will dispose two even more rearmounted circulating loudspeaker at least, if take traditional wireline audio transmission means, wiring is inconvenient and can destroy the attractive in appearance of room, influences daily life.

Adopt the ANTENN AUDIO transmission means can save the trouble of wiring, but, there are shortcomings such as antijamming capability is low, noise is big, power consumption is big, transmission range is short, data transmission rate is low in traditional ANTENN AUDIO transmission means, as common FM (frequency modulation) mode be subjected to easily to disturb, the bluetooth approach transmission bandwidth is little.Therefore, the 2.4G wireless audio transmission system occurred, it can realize the ANTENN AUDIO transmission of CD level tonequality (16, the 44.1K sample rate).When realizing the transmission of CD level ANTENN AUDIO, it also is people's demands in actual applications that the signal in single audio frequency source is play on a plurality of different loud speakers according to wish.

Summary of the invention

Therefore, the object of the present invention is to provide a kind of method of work of 2.4G wireless audio device, can make an ANTENN AUDIO sending module that four ANTENN AUDIO receiver modules are carried out the ANTENN AUDIO transmission.

The invention provides a kind of method of work of 2.4G wireless audio device, this 2.4G wireless audio device comprises an ANTENN AUDIO sending module and the first, second, third and the 4th ANTENN AUDIO receiver module, wherein, the ANTENN AUDIO sending module is worked as follows:

Step 101, frequency hopping protocol processes are provided with frequency and emission mode;

Step 102, AD conversion unit sampled audio data also are stored to data buffer;

Whetherstep 103, judgment data buffer be full, if otherwise return execution instep 102, if execution instep 104 then;

Voice data instep 104, compression, the coded data buffer, and add the ORC check code;

Voice data behindstep 105, the radio frequency unit launching code, control data and ANTENN AUDIO receiver module are replied control data;

Step 106, switching radio frequency unit are receiving mode;

Step 107, judge whether to receive the answer signal of ANTENN AUDIO receiver module, if otherwise return execution instep 101, if execution instep 108 then;

Step 108, judge whether it is the answer signal of the first ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 109;

Step 109, judge whether it is the answer signal of the second ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 110;

Step 110, judge whether it is the answer signal of the 3rd ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 111;

Step 111, be defined as the answer signal of the 4th ANTENN AUDIO receiver module, return execution instep 101 then;

Four ANTENN AUDIO receiver modules are worked as follows:

Step 201, frequency hopping protocol processes and frequency is set;

Step 202, judge whether to receive effective radiofrequency signal, if otherwise return execution instep 201, if the radiofrequency signal that arrives of demodulate reception then;

Data afterstep 203, decoding and the decompression demodulation deposit the data after decompressing in data buffer;

Whetherstep 204, judgment data buffer be full, if execution instep 205 then, if otherwise execution instep 206;

Step 205, D/A conversion unit carry out digital-to-analogue conversion to the data in the data buffer;

Step 206, radio frequency unit switch to emission mode;

Step 207, judge whether to be that the first ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 208, if execution instep 211 then;

Step 208, judge whether to be that the second ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 209, if execution instep 211 then;

Step 209, judge whether to be that the 3rd ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 210, if execution instep 211 then;

Step 210, be defined as the 4th ANTENN AUDIO receiver module and reply control data;

Step 211, corresponding ANTENN AUDIO receiver module emission answer signal.

Wherein, be provided with the command channel that is used for to player output control command word between described ANTENN AUDIO sending module and the player as audio-source, described ANTENN AUDIO receiver module is provided with the command channel for button input of control commands word; In the describedstep 211, the control command word of importing with button in the answer signal; In describedstep 108,step 109,step 110 or thestep 111, before returning execution instep 101, execution in step S also: judge to have or not the control command word to be enclosed in, if have then send ppu by the I/O mouth with control command word decoding back, return execution instep 101 again, if do not have then directly return execution instep 101.

Wherein, described player is iPhone, iPOD, MP3 or mobile phone.

Wherein, described control command word is for to play, stop, advancing or to retreat.

Wherein, the communication mode between described ANTENN AUDIO sending module and the described ANTENN AUDIO receiver module is half-duplex.

Wherein, described ANTENN AUDIO sending module and described ANTENN AUDIO receiver module are worked based on GFSK digital modulation/demodulation mode.

In sum, the present invention has realized that an ANTENN AUDIO sending module carries out the ANTENN AUDIO transmission to four ANTENN AUDIO receiver modules, can be applicable to the device of various generation audio streams, the present invention also can be implemented in the playback action of ANTENN AUDIO receiver module one end controls playing device.

Description of drawings

Below in conjunction with accompanying drawing,, will make technical scheme of the present invention and other beneficial effects apparent by the specific embodiment of the present invention is described in detail.

In the accompanying drawing,

Fig. 1 is a kind of circuit block diagram of ANTENN AUDIO sending module;

Fig. 2 is a kind of circuit block diagram of ANTENN AUDIO receiver module;

Fig. 3 is the workflow diagram of ANTENN AUDIO sending module in a preferred embodiment of the present invention;

Fig. 4 is the workflow diagram of ANTENN AUDIO receiver module in a preferred embodiment of the present invention;

Fig. 5 is the block diagram of the another preferred embodiment of the present invention;

Fig. 6 is the workflow diagram of ANTENN AUDIO sending module in the another preferred embodiment of the present invention;

Fig. 7 is the flow chart of step S among Fig. 6.

Embodiment

Figure 1 shows that a kind of circuit block diagram of using 2.4G ANTENN AUDIO sending module of the present invention, Figure 2 shows that a kind of circuit block diagram of using 2.4G ANTENN AUDIO receiver module of the present invention.As shown in Figure 1, in 2.4G ANTENN AUDIO sending module,voltage regulator 10,analog power 11 anddigital power 12 are formed power supply circuits, 11 pairs of artificial circuit part power supplies of analog power, 12 pairs of digital circuit part power supplies of digital power;AD conversion unit 13 is gathered the audio signal of left and right acoustic channels and simulated audio signal is converted to digital audio and video signals from audio-source (as sound card, mp3, CD Player, DVD player etc.); 2.4G 14 pairs of digital audio and video signals of baseband processing unit compress and encode; Under sending mode, the digital signal behindradio frequency unit 15 modulating-codings to be generating radiofrequency signal, and launches from antenna; PA (power amplifier) 16, LNA (low noise amplifier) 17 and radio-frequency (RF)switch 18 are formed radio-frequency (RF) front-end circuit, can amplify emission or the radiofrequency signal that receives.

As shown in Figure 2, in 2.4G ANTENN AUDIO receiver module,voltage regulator 20,analog power 21 anddigital power 22 are formed power supply circuits, 21 pairs of artificial circuit part power supplies of analog power, 22 pairs of digital circuit part power supplies of digital power; PA (power amplifier) 26, LNA (low noise amplifier) 27 and radio-frequency (RF)switch 28 are formed radio-frequency (RF) front-end circuit, can amplify the radiofrequency signal that receives or launch; Under receiving mode, the radiofrequency signal thatradio frequency unit 25 demodulation receive from antenna; 2.4G the signal that 24 pairs ofradio frequency units 25 of baseband processing unit demodulate is decoded and is decompressed, thereby draws digital audio and video signals; D/A conversion unit 23 is converted to simulated audio signal to digital audio and video signals, and exports respectively according to left and right acoustic channels.

Radio frequency unit 15 andradio frequency unit 25 can adopt chip ML2724,2.4Gbaseband processing unit 14 and 2.4Gbaseband processing unit 24 can adopt chip AT91SAM7S16,AD conversion unit 13 can adopt chip CE2632, and D/A conversion unit 23 can adopt chips W M8501.2.4G the ANTENN AUDIO sending module generally is connected with various audio-source, as sound card, mp3, CD Player, DVD player, television set etc., 2.4G ANTENN AUDIO receiver module generally is connected with various loudspeaker arrangements, as loud speaker, earphone, microphone etc.; Hardware setting by as above can realize I2S (Inter-IC Sound) digital audio of form and the support of analogue audio frequency.The present invention can realize that a 2.4G ANTENN AUDIO sending module carries out the ANTENN AUDIO transmission to four 2.4G ANTENN AUDIO receiver modules, just by an audio-source to four loudspeaker arrangement transmitting audio signals, for example, in household audio and video system, the rearmounted loudspeaker arrangement that the preposition loud speaker of left and right sound channels adds left and right sound channels remote four jiaos the time, just need be applied to the present invention in the room.

As shown in Figure 3, it is the workflow diagram of ANTENN AUDIO sending module in a preferred embodiment of the present invention, in this preferred embodiment, the 2.4G wireless audio device comprises an ANTENN AUDIO sending module and the first, second, third and the 4th ANTENN AUDIO receiver module; In the ANTENN AUDIO transmission course, the ANTENN AUDIO sending module sends a signal to the ANTENN AUDIO receiver module earlier, the ANTENN AUDIO receiver module sends a signal to the ANTENN AUDIO sending module more then, thereby form a communication cycle, between ANTENN AUDIO sending module and the ANTENN AUDIO receiver module communicate by letter according to this cycle constantly circulation repeat.At the transmitting terminal of ANTENN AUDIO transmission, in a communication cycle, the ANTENN AUDIO sending module is by step work as shown in Figure 3.

Step 101, frequency hopping protocol processes are provided with frequency and emission mode, and the present invention adopts the work of frequency hopping mode to disturb to avoid producing signal; In this step, can carry out the frequency hopping protocol processes by baseband processing unit, baseband processing unit can adopt GFSK (Gauss Frequency Shift Key, Gaussian Frequency Shift Keying) digital modulation/demodulation mode to work; Make radio frequency unit be operated in ISM (i.e. industry, science, the medical science) frequency range of 2.4GHz, 20 optional frequencies are provided, thereby can satisfy multifrequency and frequency hopping needs according to the frequency that is provided with; Communication pattern between ANTENN AUDIO sending module and the ANTENN AUDIO receiver module can be set to half-duplex, can set emission mode according to actual demand, length, the signal of setting communication cycle send or time slot arrangement, the signal transmission of reception or the sequential scheduling that receives.

Step 102, AD conversion unit sampled audio data also are stored to data buffer, transfer digital signal to and are stored to data buffer after audio-source is gathered simulated audio signal.

Whetherstep 103, judgment data buffer be full, if otherwise return execution instep 102, if execution instep 104 then, the capacity of data buffer can be reference with the data volume that can send in the ANTENN AUDIO process of transmitting.

Voice data instep 104, compression, the coded data buffer, and interpolation ORC check code, this step is carried out by baseband processing unit, and baseband processing unit can adopt GFSK (GaussFrequency Shift Key, Gaussian Frequency Shift Keying) digital modulation/demodulation mode to work.

Voice data behindstep 105, the radio frequency unit launching code, control data and ANTENN AUDIO receiver module are replied control data, control data is used for the operating state at the control ANTENN AUDIO receiver module of voice playing process, as control its time-out, control it and enter battery saving mode etc., the ANTENN AUDIO receiver module is replied the responder action that control data is used to control the ANTENN AUDIO receiver module, as when sending answer signal etc.; Because the recipient is four ANTENN AUDIO receiver modules, so the send mode of ANTENN AUDIO sending module can adopt the broadcast mode of point-to-multipoint.

Step 106, switching radio frequency unit are receiving mode, prepare to receive the answer signal from the ANTENN AUDIO receiver module, to judge the result of this ANTENN AUDIO process of transmitting.

Step 107, judge whether to receive the answer signal of ANTENN AUDIO receiver module, if otherwise return execution instep 101, if execution instep 108 then, on behalf of this ANTENN AUDIO, "No" send may fail to be sent to the ANTENN AUDIO receiver module, therefore need return execution instep 101, on behalf of this ANTENN AUDIO, "Yes" send and has been sent to the ANTENN AUDIO receiver module.

Step 108, judge whether it is the answer signal of the first ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 109.

Step 109, judge whether it is the answer signal of the second ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 110.

Step 110, judge whether it is the answer signal of the 3rd ANTENN AUDIO receiver module, if then return execution instep 101, if otherwise execution instep 111.

Step 111, be defined as the answer signal of the 4th ANTENN AUDIO receiver module, return execution instep 101 then.

Which ANTENN AUDIO receiver module determines to send what reply according to the answer signal that receives among the step 108-111 specifically is, execution instep 111 is restarted new communication cycle then.

As shown in Figure 4, it is the workflow diagram of ANTENN AUDIO receiver module in a preferred embodiment of the present invention, and at the receiving terminal of ANTENN AUDIO transmission, in a communication cycle, four ANTENN AUDIO receiver modules are by as shown in Figure 4 step work.

Step 201, frequency hopping protocol processes and frequency is set, four ANTENN AUDIO receiver modules and the unification of ANTENN AUDIO sending module according to the frequency hopping agreement in selected frequency work.

Step 202, judge whether to receive effective radiofrequency signal, if otherwise return execution instep 201, if the radiofrequency signal that arrives of demodulate reception then, the ANTENN AUDIO receiver module is at first determined the validity of the signal that receives, then by the radio frequency unit demodulation.

Data afterstep 203, decoding and the decompression demodulation, deposit the data after decompressing in data buffer, carry out this step by baseband processing unit, thereby restore digital audio and video signals, baseband processing unit can adopt GFSK (Gauss Frequency Shift Key, Gaussian Frequency Shift Keying) digital modulation/demodulation mode to work.

Whetherstep 204, judgment data buffer be full, if execution instep 205 then, if otherwise execution instep 206.

Step 205, D/A conversion unit carry out digital-to-analogue conversion to the data in the data buffer, export to all kinds of loudspeaker arrangements after digital audio and video signals is converted to simulated audio signal, as loud speaker, earphone, microphone etc.

Step 206, radio frequency unit switch to emission mode, and the ANTENN AUDIO receiver module is prepared to reply control data to the ANTENN AUDIO sending module according to the reception condition of ANTENN AUDIO.

Step 207, judge whether to be that the first ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 208, if execution instep 211 then.

Step 208, judge whether to be that the second ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 209, if execution instep 211 then.

Step 209, judge whether to be that the 3rd ANTENN AUDIO receiver module is replied control data, if otherwise execution instep 210, if execution instep 211 then.

Step 210, be defined as the 4th ANTENN AUDIO receiver module and reply control data.

Step 211, corresponding ANTENN AUDIO receiver module emission answer signal.Because the communication modes between ANTENN AUDIO sending module and the ANTENN AUDIO receiver module is the semiduplex mode of point-to-multipoint, therefore in a communication cycle, at first need to arrange to be specially which ANTENN AUDIO receiver module and reply control data by step 207-210, instep 211, arrange this ANTENN AUDIO receiver module to ANTENN AUDIO sending module emission answer signal then, after the execution ofstep 211, returnstep 201 and receive ANTENN AUDIO transmission next time with wait.

As shown in Figure 3 and Figure 4, the present invention has realized that an ANTENN AUDIO sending module carries out the ANTENN AUDIO transmission to four ANTENN AUDIO receiver modules, enforcement of the present invention does not need to change the structure of existing various 2.4G ANTENN AUDIO transmitting devices, can combine with the device of various generation audio streams with the wireless transmission audio frequency, for example can be applicable to wireless speaker, sound card, mp3, CD Player, DVD player, earphone, microphone etc., because the 2.4G wireless transmission method has the confidentiality height, volume is small and exquisite, power saving, long transmission distance, duplex simultaneous two-way work, advantages such as transmission bandwidth is bigger, so its application prospect is extensive.

As shown in Figure 5, it is for the block diagram of the another preferred embodiment of the present invention.In actual the use, because the distance between ANTENN AUDIO sending module and the ANTENN AUDIO receiver module is far away, the loud speaker that the player distance that is connected with the ANTENN AUDIO sending module is connected with the ANTENN AUDIO receiver module is also far away, and the user is nearer apart from loud speaker one end usually, and therefore wishing can be in the playback action of ANTENN AUDIO receiver module one end controls playing device.In this preferred embodiment, also be provided with the command channel that is used for to player output control command word between ANTENN AUDIO sending module and the player except that being provided with the voice-grade channel that is used for input audio signal, the ANTENN AUDIO receiver module also is provided with the command channel for button input of control commands word except that having the voice-grade channel that is used for output audio signal; Player is by the ADC (AD conversion unit) of voice-grade channel output audio signal to the ANTENN AUDIO sending module, the ANTENN AUDIO sending module sends wireless audio signal to first, second, third and the 4th ANTENN AUDIO receiver module, changes after audio frequency amplifier amplifies to export loud speaker 1-4 respectively to through the DAC of ANTENN AUDIO receiver module (D/A conversion unit); By on the ANTENN AUDIO receiver module, setting up the button that is used to import, user's input of control commands word is to the command channel, the control command word is attached on the audio signal and is sent to the ANTENN AUDIO sending module via the ANTENN AUDIO receiver module, and the ANTENN AUDIO sending module is delivered to command word decoding back the ppu of player by the I/O mouth; For the player that audio interface has the line traffic control function, the command channel between ANTENN AUDIO sending module and the player need not to change the original structure of player, only need utilize the line traffic control interface of player to get final product.In this embodiment, player can be iPhone, iPOD, MP3 and mobile phone etc.; The control command word that can import by button comprises that the controls playing device plays, stops, advancing and retreat etc.

As Figure 6 and Figure 7, Fig. 6 is the workflow diagram of middle ANTENN AUDIO sending module embodiment illustrated in fig. 5, and Fig. 7 is the flow chart of step S among Fig. 6.The user is by the control command word of button input ANTENN AUDIO receiver module, can when ANTENN AUDIO receiver module emission answer signal, together be transmitted to the ANTENN AUDIO sending module, wireless sending module is when carrying out its workflow, instep 108,step 109, instep 110 or thestep 111, before returning execution instep 101, execution in step S also: judge to have or not the control command word to be enclosed in, if have then send ppu by the I/O mouth with command word decoding back, return execution instep 101 again, if do not have then directly return execution instep 101, thereby give player with the control command word, be implemented in ANTENN AUDIO receiver module one end and can make broadcast by the controls playing device, stop, action such as advance or retreat makes things convenient for the user.Among this embodiment, similar among other job step of ANTENN AUDIO sending module and Fig. 3, do not repeat them here.

In sum, the present invention has realized that an ANTENN AUDIO sending module carries out the ANTENN AUDIO transmission to four ANTENN AUDIO receiver modules, enforcement of the present invention does not need to change the structure of existing various 2.4G ANTENN AUDIO transmitting devices, can combine with the device of various generation audio streams with the wireless transmission audio frequency, the present invention also can be implemented in the playback action of ANTENN AUDIO receiver module one end controls playing device.

The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of accompanying Claim of the present invention.

Claims (6)

Translated fromChinese

1.一种2.4G无线音频装置的工作方法，该2.4G无线音频装置包括一个无线音频发送模块和第一、第二、第三及第四无线音频接收模块，其特征在于，1. A kind of working method of 2.4G wireless audio device, this 2.4G wireless audio device comprises a wireless audio transmission module and first, second, third and the 4th wireless audio receiving module, it is characterized in that,无线音频发送模块按如下步骤工作：The wireless audio sending module works as follows:步骤101、跳频协议处理，设置频点和发射模式；Step 101, frequency hopping protocol processing, setting frequency point and transmission mode;步骤102、模数转换单元采样音频数据并存储至数据缓冲器；Step 102, the analog-to-digital conversion unit samples the audio data and stores it in a data buffer;步骤103、判断数据缓冲器是否满，如果否则返回执行步骤102，如果是则执行步骤104；Step 103, judging whether the data buffer is full, if otherwise, return to step 102, and if so, step 104;步骤104、压缩、编码数据缓冲器中的音频数据，并添加ORC校验码；Step 104, compressing and encoding the audio data in the data buffer, and adding an ORC check code;步骤105、射频单元发射编码后的音频数据、控制数据及无线音频接收模块应答控制数据；Step 105, the radio frequency unit transmits the encoded audio data, control data, and the wireless audio receiving module responds to the control data;步骤106、切换射频单元为接收模式；Step 106, switch the radio frequency unit to receive mode;步骤107、判断是否接收到无线音频接收模块的应答信号，如果否则返回执行步骤101，如果是则执行步骤108；Step 107, judging whether the response signal of the wireless audio receiving module is received, if otherwise, return to step 101, and if so, execute step 108;步骤108、判断是否是第一无线音频接收模块的应答信号，如果是则返回执行步骤101，如果否则执行步骤109；Step 108, judging whether it is the response signal of the first wireless audio receiving module, if so, returning to step 101, otherwise performing step 109;步骤109、判断是否是第二无线音频接收模块的应答信号，如果是则返回执行步骤101，如果否则执行步骤110；Step 109, judging whether it is the response signal of the second wireless audio receiving module, if so, returning to step 101, otherwise performing step 110;步骤110、判断是否是第三无线音频接收模块的应答信号，如果是则返回执行步骤101，如果否则执行步骤111；Step 110, judging whether it is the response signal of the third wireless audio receiving module, if yes, then return to step 101, if otherwise, execute step 111;步骤111、确定为第四无线音频接收模块的应答信号，然后返回执行步骤101；Step 111, determine it as the response signal of the fourth wireless audio receiving module, and then return to execute step 101;四个无线音频接收模块按如下步骤工作：The four wireless audio receiving modules work as follows:步骤201、跳频协议处理和设置频点；Step 201, frequency hopping protocol processing and frequency setting;步骤202、判断是否收到有效的射频信号，如果否则返回执行步骤201，如果是则解调接收到的射频信号；Step 202, judging whether a valid radio frequency signal is received, if not, return to step 201, and if so, demodulate the received radio frequency signal;步骤203、解码和解压缩解调后的数据，将解压缩后的数据存入数据缓冲器；Step 203, decoding and decompressing the demodulated data, and storing the decompressed data into a data buffer;步骤204、判断数据缓冲器是否满，如果是则执行步骤205，如果否则执行步骤206；Step 204, judging whether the data buffer is full, if so, execute step 205, if otherwise execute step 206;步骤205、数模转换单元对数据缓冲器中的数据进行数模转换；Step 205, the digital-to-analog conversion unit performs digital-to-analog conversion on the data in the data buffer;步骤206、射频单元切换为发射模式；Step 206, switch the radio frequency unit to transmit mode;步骤207、判断是否为第一无线音频接收模块应答控制数据，如果否则执行步骤208，如果是则执行步骤211；Step 207, judging whether the first wireless audio receiving module responds to the control data, if not, execute step 208, if yes, execute step 211;步骤208、判断是否为第二无线音频接收模块应答控制数据，如果否则执行步骤209，如果是则执行步骤211；Step 208, judging whether the second wireless audio receiving module responds to the control data, if not, execute step 209, if yes, execute step 211;步骤209、判断是否为第三无线音频接收模块应答控制数据，如果否则执行步骤210，如果是则执行步骤211；Step 209, judging whether the third wireless audio receiving module responds to the control data, if not, execute step 210, if yes, execute step 211;步骤210、确定为第四无线音频接收模块应答控制数据；Step 210, determine that the fourth wireless audio receiving module responds to the control data;步骤211、相应的无线音频接收模块发射应答信号。Step 211, the corresponding wireless audio receiving module transmits a response signal.2.如权利要求1所述的2.4G无线音频装置的工作方法，其特征在于，所述无线音频发送模块与作为音频源的播放器之间设有用于向播放器输出控制命令字的命令通道，所述无线音频接收模块设有供按键输入控制命令字的命令通道；所述步骤211中，应答信号中附有按键输入的控制命令字；所述步骤108、步骤109、步骤110或步骤111中，在返回执行步骤101前，还执行步骤S：判断有无控制命令字附入，如果有则将控制命令字解码后由I/O口送外部处理器，再返回执行步骤101，如果无则直接返回执行步骤101。2. the working method of 2.4G wireless audio device as claimed in claim 1, is characterized in that, be provided with the command channel for outputting control command word to player between described wireless audio transmission module and the player as audio source , the wireless audio receiving module is provided with a command channel for key input control command words; in the step 211, the response signal is accompanied by a key input control command word; the step 108, step 109, step 110 or step 111 Among them, before returning to execute step 101, also execute step S: judge whether there is a control command word attached, if there is, then send the external processor by the I/O port after the control command word is decoded, then return to execute step 101, if no Then directly return to step 101.3.如权利要求1所述的2.4G无线音频装置的工作方法，其特征在于，所述播放器为iPhone、iPOD、MP3或手机。3. The working method of the 2.4G wireless audio device as claimed in claim 1, wherein the player is iPhone, iPOD, MP3 or mobile phone.4.如权利要求1所述的2.4G无线音频装置的工作方法，其特征在于，所述控制命令字为播放、停止、前进或后退。4. The working method of the 2.4G wireless audio device according to claim 1, wherein the control command word is play, stop, forward or backward.5.如权利要求1所述的2.4G无线音频装置的工作方法，其特征在于，所述无线音频发送模块与所述无线音频接收模块之间的通信方式为半双工。5. The working method of a 2.4G wireless audio device according to claim 1, wherein the communication mode between the wireless audio sending module and the wireless audio receiving module is half-duplex.6.如权利要求1所述的2.4G无线音频装置的工作方法，其特征在于，所述无线音频发送模块与所述无线音频接收模块基于GFSK数字调制/解调方式工作。6. The working method of the 2.4G wireless audio device according to claim 1, wherein the wireless audio sending module and the wireless audio receiving module work based on GFSK digital modulation/demodulation.

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