CN103051928A - Method and device for wireless audio and video data transmission - Google Patents
Method and device for wireless audio and video data transmission Download PDFInfo
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Abstract
The invention discloses a method and device for wireless audio and video data transmission. The method comprises the following steps: a microprocessor of first electronic equipment obtains original video data acquired by a video acquisition unit and original audio data acquired by an audio acquisition unit; the original video data and the original audio data are subjected to compression and coding so as to form at least one original audio and video data block; CRC (Cyclical Redundancy Check) codes are added to the original audio and video data block, and scrambling is carried out so as to form audio and video data blocks to be framed; and after all data frames to be sent are subjected to framing processing, the audio and video data blocks to be framed of the data frames to be sent are sent to a wireless data transmission chip according to a data packet format specified in a frame structure which is provided with a transmission time interval between video sub-frames and audio sub-frames, and corresponding radio-frequency signals output by the wireless data transmission chip are sent through an antenna. According to the method and the device, the two-way-interaction wireless audio and video data transmission is realized without relying on the support of a 3G (3rd Generation) network.
Description
Technical field
The present invention relates to radio transmission technical field, particularly relate to a kind of wireless audio and video data transmission method and device.
Background technology
The radio transmission apparatus such as traditional intercom, Vehicle mounted station, trunk desk generally adopt arrowband analogue transmission system, and because narrow band bandwidth only has tens KHz, cause traditional radio transmission apparatus can only transmit the frequency modulation speech; Simultaneously, because there are the shortcomings such as speech quality is relatively poor, transfer of data is had any problem, networking is dumb in the self reason of simulation system.Therefore, radio transmission apparatus adopts digital system usually at present, has solved the Wireless Data Transmission shortcoming that the simulation system self is brought with this.
But, along with the continuous increase of people's demand, on the market about the demand of the radio transmission apparatus of the audio, video data transfer function that possesses two-way interactive also in continuous increase.And the existing radio transmission apparatus that possesses the audio, video data transfer function of two-way interactive generally all depends on the support of 3G network, therefore, has certain network environment and uses limitation.Such as: without open-air or some case of emergency of 3G network etc., the radio transmission apparatus that relies on the 3G network support can't be realized the wireless audio and video transfer of data.
As seen, under the support that does not rely on 3G network, the wireless audio and video transfer of data that how to realize two-way interactive is a problem that merits attention.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of wireless audio and video data transmission method and device, with under the support that does not rely on 3G network, realizes the wireless audio and video transfer of data of two-way interactive, and technical scheme is as follows:
First aspect, the embodiment of the invention provide a kind of wireless audio and video data transmission method, are applicable to the first electronic equipment, and described method comprises:
The microprocessor of described the first electronic equipment obtains the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
To original video data and the original audio data compressed encoding that obtains, to form at least one original audio, video data piece;
Described original audio, video data piece is added CRC check code and scrambling processing, treat framing audio, video data piece with formation;
After each Frame to be sent being comprised at least the framing processing of structure video subframe and audio frequency subframe, data packet format according to defined in the frame structure that is provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, the described framing audio, video data piece for the treatment of corresponding to Frame to be sent is sent to the wireless data sending chip of self, and the respective radio-frequency signals that described wireless data sending chip is exported sends by antenna;
Wherein, described video subframe comprises the video data part in the framing audio, video data piece treated in the frame, and described audio frequency subframe comprises the voice data part in the framing audio, video data piece treated in the respective frame.
Wherein, the respective radio-frequency signals that described wireless data sending chip is exported sends by antenna, comprising:
The respective radio-frequency signals that described wireless data sending chip is exported is carried out power amplification;
Radiofrequency signal after the power amplification is sent by antenna.
Wherein, a Frame to be sent is comprised the framing that makes up video subframe and audio frequency subframe at least processes, comprising:
Add video subframe head for the video subframe in the Frame to be sent, the audio frequency subframe is added audio frequency subframe head;
Determine the packet of the first quantity that described Frame is corresponding, wherein, comprise in the packet of described the first quantity: the packets of audio data of the 3rd quantity that the video packets of data of the second quantity that described video subframe is corresponding and described audio frequency subframe are corresponding, described the second quantity and described the 3rd quantity sum are the first quantity;
For each packet in the described Frame adds the CRC check code and carries out chnnel coding, finish framing with this and process.
Wherein, described Frame wherein, comprises in 13 packets 13 packets should be arranged: 12 video packets of data that described video subframe is corresponding and 1 packets of audio data corresponding to described audio frequency subframe.
Wherein, the described frame structure that is provided with the Transmission Time Interval of described video subframe and described audio frequency subframe comprises:
The transmission time of each packet is 1.292ms, and the adjacent data parlor has the Transmission Time Interval of 150us, has the Transmission Time Interval of 627us between described video subframe and the described audio frequency subframe.
Wherein, described wireless data sending chip comprises the processing procedure of received packet:
Received packet is put into First Input First Output;
For the packet current waiting for transmission of determining from described First Input First Output adds synchronization preamble and EIC equipment identification code;
Be modulation signal with original series bits switch corresponding to described current packet waiting for transmission;
Described modulation signal is carried out the mixing upconversion process;
Formed radiofrequency signal is carried out power amplification after will carrying out the mixing upconversion process to described modulation signal, is applicable to the corresponding radiofrequency signal of antenna transmission with formation.
Second aspect, the embodiment of the invention provide a kind of wireless audio and video data transmission method, are applicable to the second electronic equipment, and described method comprises:
The packet that the wireless data sending chip of the microprocessor reception in the second electronic equipment self reports;
Received packet is carried out corresponding channel-decoding and CRC check successively;
When carrying video subframe head or audio frequency subframe in the packet of CRC check success, recover corresponding video subframe or audio frequency subframe in the frame;
When carrying the frame head of a frame in the packet of CRC check success, recover corresponding Frame;
After recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in the described Frame, and after the CRC check success, obtain original audio, video data piece;
After acquiring all original audio, video data pieces, with the original audio, video data piece decompression decoding that obtains, to obtain corresponding original audio data and original video data.
Wherein, described method also comprises:
Export described original audio data and original video data.
Wherein, described method also comprises:
The microprocessor of described the second electronic equipment to antenna reception to radiofrequency signal carry out low noise amplification after, be sent to the wireless data sending chip, so that the wireless data sending chip is processed received radiofrequency signal.
Wherein, described wireless data sending chip comprises the processing procedure of received radiofrequency signal:
Accessed radiofrequency signal is carried out the mixing down-conversion;
To be converted to baseband signal to formed signal after the described radiofrequency signal down-conversion;
According to synchronization preamble, described baseband signal is carried out a decision process, to be converted to original bit sequence;
When the EIC equipment identification code of the EIC equipment identification code in the described original bit sequence and described the second electronic equipment self is identical, described original bit sequence is put into corresponding First Input First Output with data packet form, and then report the microprocessor of described the second electronic equipment.
The third aspect, the embodiment of the invention provide a kind of wireless audio and video data transmission device, are applicable to the microprocessor of the first electronic equipment, and described wireless audio and video data transmission device comprises:
The initial data acquisition module is used for obtaining the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
Original data block forms module, is used for original video data and original audio data compressed encoding to obtaining, to form at least one original audio, video data piece;
Treat that the framing data block forms module, be used for described original audio, video data piece is added CRC check code and scrambling processing, treat framing audio, video data piece with formation;
The framing processing module is used for that each Frame to be sent is comprised the framing that makes up video subframe and audio frequency subframe at least and processes; Wherein, described video subframe comprises the video data part in the framing audio, video data piece treated in the frame, and described audio frequency subframe comprises the voice data part in the framing audio, video data piece treated in the respective frame;
The Packet Generation module, be used for after the Frame process processing of described framing processing module to be sent, according to the data packet format of defined in the frame structure that is provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, the described framing audio, video data piece for the treatment of corresponding to Frame to be sent is sent to the wireless data sending chip of self;
The radiofrequency signal sending module, the respective radio-frequency signals that is used for described wireless data sending chip is exported sends by antenna.
Fourth aspect, the embodiment of the invention provide a kind of wireless audio and video data transmission device, are applicable to the microprocessor of the second electronic equipment, and described wireless audio and video data transmission device comprises:
Packet-receiving module be used for to receive the packet that self wireless data sending chip reports;
The processing data packets module is used for received packet is carried out corresponding channel-decoding and CRC check successively;
The audio frequency and video subframe is recovered module, when being used for packet when the CRC check success and carrying video subframe head or audio frequency subframe, recovers in the frame accordingly video subframe or audio frequency subframe;
Frame recovers module, is used for recovering corresponding Frame when the packet of CRC check success carries the frame head of a frame;
Original audio, video data piece recovers module, is used for after recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in the described Frame, to obtain original audio, video data piece after the CRC check success;
Initial data is recovered module, is used for after acquiring all original audio, video data pieces, the original audio, video data piece that obtains is decompressed decode, to obtain corresponding original audio data and original video data.
In the technical scheme that the embodiment of the invention provides, Frame to be sent comprises video subframe and audio frequency subframe, and under the support of wireless data sending chip that can the transmission tone video data not relying on 3G network, reaches the effect that sends audio, video data; And, in frame structure, be provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, so that can carrying out transceiver mode in this Transmission Time Interval, the wireless data sending chip switches, and then under the support that does not rely on 3G network, realized the wireless audio and video transfer of data of two-way interactive.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The first flow process of the wireless audio and video data transmission method that Fig. 1 provides for the embodiment of the invention;
The second flow chart of the wireless audio and video data transmission method that Fig. 2 provides for the embodiment of the invention;
The third flow chart of the wireless audio and video data transmission method that Fig. 3 provides for the embodiment of the invention;
The 4th kind of flow chart of the wireless audio and video data transmission method that Fig. 4 provides for the embodiment of the invention;
The 5th kind of flow chart of the wireless audio and video data transmission method that Fig. 5 provides for the embodiment of the invention;
The frame structure schematic diagram of the Frame that Fig. 6 provides for the embodiment of the invention;
The first structural representation of the wireless audio and video data transmission device that Fig. 7 provides for the embodiment of the invention;
The second structural representation of the wireless audio and video data transmission device that Fig. 8 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
For under the support that does not rely on 3G network, realize the wireless audio and video transfer of data of two-way interactive, the embodiment of the invention provides wireless audio and video data transmission method and device.
The below at first is introduced the wireless audio and video data transmission method that the embodiment of the invention provides.
For the sake of clarity, how the below carries out the wireless audio and video transfer of data as example take the first electronic equipment and the second electronic equipment, and the wireless audio and video data transmission method that the embodiment of the invention is provided is introduced.Be understandable that in actual applications, the first electronic equipment and the second electronic equipment all can be intercom, Vehicle mounted station etc.
As transmit leg, the wireless audio and video data transmission method that the embodiment of the invention is provided is introduced the below with the first electronic equipment.
As shown in Figure 1, a kind of wireless audio and video data transmission method can comprise:
S101, the microprocessor of the first electronic equipment obtain the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
When the user need to utilize this first electronic equipment to send the wireless audio and video data to the second electronic equipment, can open shooting-recording function, video acquisition unit gathers original video data and the audio collection unit gathers original audio data to trigger, and the microprocessor of this first electronic equipment is after shooting with video-corder end, obtain the original audio data that original video data that this video acquisition unit gathers and audio collection unit gather, and utilize the audio, video data that gathers to carry out follow-up processing.
Be understandable that in actual applications, this video acquisition unit can be camera, and this audio collection unit can be microphone; And the microprocessor of this first electronic equipment can adopt the ARM chip, and follow-up wireless data sending chip is by the ARM chip configuration.Wherein, this wireless data sending chip acquiescence running parameter comprises: radio interface rate is 500Kbps, with the video code stream rate that is adapted to 256Kbps and the audio code stream speed of 15Kbps; Be free civilian intercom communications band and transmit and receive frequency range.
S102 is to original video data and the original audio data compressed encoding that obtains, to form at least one original audio, video data piece;
S103 adds CRC check code and scrambling processing to described original audio, video data piece, treats framing audio, video data piece with formation;
After getting access to original video data and original audio data, can carry out compressed encoding to original video data and original audio data, to form at least one original audio, video data piece; Wherein, comprise a part of original video data and corresponding a part of original audio data in each original audio, video data piece.
And, confirm for the ease of the recipient whether original audio, video data piece is correct, can add the CRC check code to original audio, video data piece; Further, in order to reduce the channel burst interference to the impact of transmission, can carry out scrambling to the original audio, video data piece behind the interpolation CRC check code and process, treat framing audio, video data piece with formation.Wherein, scrambling mode is that the first electronic equipment and the second electronic equipment are made an appointment.
Wherein, so-called scrambling is treated to: original transmission sequence is logically upset, recovered again during reception.It will be appreciated by persons skilled in the art that the scrambling mode can comprise: the Bit scrambling, scrambling etc. interweaves; And the Bit scrambling not only can effectively disturb the impact on transmission to spread out channel burst, and has certain confidential nature, so that other recipients can not effectively restore source code flow in the situation of not knowing the scrambling rule, therefore, advantage based on the Bit scrambling, in actual applications, usually select Bit scrambling mode.
S104 comprises at least the framing that makes up video subframe and audio frequency subframe to each Frame to be sent and processes;
Wherein, this video subframe comprises the video data part in the framing audio, video data piece treated in the frame, and this audio frequency subframe comprises the voice data part in the framing audio, video data piece treated in the respective frame.
S105, the framing audio, video data piece for the treatment of that the Frame that this is to be sent is corresponding is sent to the wireless data sending chip;
After the Frame that each is to be sent carries out the framing processing, can be according to the data packet format of defined in the frame structure that is provided with the Transmission Time Interval between this video subframe and this audio frequency subframe, byte number with each packet, the framing audio, video data piece for the treatment of that the Frame that each is to be sent is corresponding successively is sent to the wireless data sending chip of self, and then by the wireless data sending chip audio, video data in the received Frame is carried out respective handling.
S106, the respective radio-frequency signals that this wireless data sending chip is exported sends by antenna.
After the wireless data sending chip forms corresponding radiofrequency signal, radiofrequency signal can be sent by antenna, so that corresponding the second electronic equipment in the aerial radiation scope receives corresponding radiofrequency signal.
Be understandable that Frame should comprise at least: frame head and data division; Wherein, this frame head partly carries specific control or identification information, such as: frame number, synchronizing information, equipment mark code etc., this data division then correspondence is treated framing audio, video data piece.
Need to prove that in the wireless audio and video data transmission procedure, the first electronic equipment is from entering time sequence status without time sequence status; Wherein, for transmit leg, what is called without time sequence status is: before the beginning transmitting data frame, be in the state that always receives; So-called time sequence status specifically refers to: when beginning transmission tone video data, begin to send the first frame data from sending initial time, and constantly send the process of subsequent sound video data according to the time requirement of frame structure.
Wherein, a Frame to be sent is comprised the framing that makes up video subframe and audio frequency subframe at least processes, as shown in Figure 2, can comprise:
S201 adds video subframe head for the video subframe in the Frame to be sent, and the audio frequency subframe is added audio frequency subframe head;
Wherein, this video subframe correspondence is treated the video data part in the framing audio, video data piece, and audio frequency subframe correspondence is treated the voice data part in the framing audio, video data piece.
Need to prove, in order to be easy to identification and frame synchronization, when making up video subframe head and audio frequency subframe, can select to comprise A, C, the sequences such as 3,5 are to improve in the frame head 1 and 0 alternately property, simultaneously, audio frequency subframe head and a video subframe difference should be enough large, influence each other avoiding.For example: video subframe head can be selected CA3553AC, and audio frequency subframe head can be selected 0xAACC5533, certainly is not limited to this.
S202 determines the packet of the first quantity that this Frame is corresponding;
Wherein, comprise in the packet of this first quantity: the packets of audio data of the 3rd quantity that the video packets of data of the second quantity that this video subframe is corresponding and this audio frequency subframe are corresponding, this second quantity and the 3rd quantity sum are the first quantity.
S203 for each packet in this Frame adds the CRC check code and carries out chnnel coding, finishes framing with this and processes.
Wherein, channel coding method is that the first electronic equipment and the second electronic equipment are made an appointment.
Be understandable that, can effectively correct the error code that channel causes transmission by chnnel coding.Wherein, common channel coding method can comprise: RS coding, linear block codes, convolution code, Turbo code etc.And because the RS coding is linear code, only relevant with the present encoding data block during coding, therefore with respect to nonlinear codes such as convolution code, Turbo codes, the coding and decoding process is fairly simple, and with respect to the linear block codes that is all linear code, the RS coding can effectively resist bursty interference, therefore, to sum up advantage can be selected RS(63,55 in this scheme) coded system carries out chnnel coding.
Need to prove that the quantity of the packet that a Frame comprises is determined according to original audio, video data speed.And generally, as the camera collection of video acquisition unit to the code check of vision signal behind video compression coding be 256Kbps, the code check of audio signal behind the audio compression coding that collects as the microphone of audio collection unit is 15Kbps, be respectively 307.2Kbps and 25.6Kbps through the code check after interpolation CRC and the chnnel coding, therefore, in the frame of each lasting 20ms, the video packets of data of 12 64 bytes and the packets of audio data of 1 64 byte are arranged, namely in actual applications, after having determined that each Frame is the time span of 20ms, owing to original audio, video data speed reason, Frame will be to there being 13 packets, wherein, comprise in 13 packets: 12 video packets of data that this video subframe is corresponding and 1 packets of audio data corresponding to this audio frequency subframe.Accordingly, when the Frame that continues 20ms when 13 packets should be arranged, as shown in Figure 6, the frame structure that is provided with the Transmission Time Interval of this video subframe and this audio frequency subframe can comprise:
The transmission time of each packet is 1.292ms, and the adjacent data parlor has the Transmission Time Interval of 150us, has the Transmission Time Interval of 627us between this video subframe and the described audio frequency subframe.
Wherein, as shown in Figure 6, Packet0 ~ Packet11 is 12 video packets of data, forms the video subframe, and Voice Packet is packets of audio data, is the audio frequency subframe.The transmission time of each packet is 1.292ms, and each video data parlor has the data time of 150us, at this 150us in the time, originating party is used for preparing packet to be sent, the recipient is used for obtaining the packet of reception, and therefore, the time of finishing each data packet transceive is 1.442ms; Simultaneously, there is the reiving/transmitting state switching time of 627us between video subframe and audio frequency subframe, be used for determines the reiving/transmitting state of wireless data sending chip in each subframe time period, provide condition as the audio video transmission of two-way mutual.
For the wireless data sending chip, it does not rely on the support of 3G network, adopts digital system, possesses the ability of broadband wireless Digital Transmission, and, be operated in free civilian intercom working frequency range.As shown in Figure 3, this wireless data sending chip can comprise the processing procedure of received packet:
S301 puts into received packet the First Input First Output of self;
S302 is for the packet current waiting for transmission of determining from this First Input First Output adds synchronization preamble and EIC equipment identification code;
Be understandable that, for current packet waiting for transmission adds synchronization preamble, to allow the recipient can set up rapidly and accurately bit synchronization at every turn; And for EIC equipment identification code, when only having transmit leg and recipient's EIC equipment identification code identical, could communicate by letter mutually.
Wherein, for the situation of the packets of audio data of the video packets of data that comprises 12 64 bytes in the above-mentioned frame and 1 64 byte, because each 64 byte data bags to be transmitted, therefore, can before this packet, add 32 bits 0,1 alternate sequence, be synchronization preamble, and then add the EIC equipment identification code of 8 bytes, certainly be not limited to this.
S303, the original series bits switch that this current packet waiting for transmission is corresponding is modulation signal;
In order to carry out follow-up radio-frequency transmissions, needing original series bits switch corresponding to this current packet waiting for transmission is modulation signal.In actual applications, can pass through FSK((Frequency-shift keying, frequency shift keying) modulation system is modulation signal with original series bits switch corresponding to this current packet waiting for transmission, certainly is not limited to this.
S304 carries out the mixing upconversion process with this modulation signal;
After forming modulation signal, because frequency modulating signal is lower, possibly can't pass through antenna transmission, therefore, this modulation signal is carried out the mixing upconversion process, upconvert on the radio-frequency transmissions carrier wave with the modulation signal that frequency is lower, carry out radio-frequency transmissions with the coupling antenna.
S305 carries out power amplification with formed radiofrequency signal after the mixing upconversion process, is applicable to the corresponding radiofrequency signal of antenna transmission with formation.
In order further to mate the power demand of antenna, formed radiofrequency signal after the mixing upconversion process can be carried out power amplification, be applicable to the corresponding radiofrequency signal of antenna transmission with formation.
Need to prove, be the logical layer processing procedure in data handling procedure corresponding to microprocessor, and processing procedure corresponding to wireless data sending chip is the physical layer process process.
In the technical scheme that the embodiment of the invention provides, Frame to be sent comprises video subframe and audio frequency subframe, and under the support of wireless data sending chip that can the transmission tone video data not relying on 3G network, reaches the effect that sends audio, video data; And, in frame structure, be provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, so that can carrying out transceiver mode in this Transmission Time Interval, the wireless data sending chip switches, and then under the support that does not rely on 3G network, realized the wireless audio and video transfer of data of two-way interactive.
Further, have relatively high power in order to make the radiofrequency signal of launching, and then realize remote wireless audio and video transfer of data, the respective radio-frequency signals that described wireless data sending chip is exported sends by antenna, can comprise:
The respective radio-frequency signals that this wireless data sending chip is exported is carried out power amplification;
Radiofrequency signal after the power amplification is sent by antenna.
Accordingly, the below as the recipient, the wireless audio and video data transmission method that the embodiment of the invention is provided is introduced with the second electronic equipment.
As shown in Figure 4, a kind of wireless audio and video data transmission method can comprise:
S401, the packet that the wireless data sending chip of the microprocessor reception in the second electronic equipment self reports;
Need to prove that the second electronic equipment is from entering time sequence status without time sequence status; Wherein, for the recipient, what is called without time sequence status is: before not receiving the active data frame, the second electronic equipment is in the state that always receives; So-called time sequence status refers to: so-called time sequence status specifically refers to: when transmit leg begins the transmission tone video data, at the transmission initial time of every bag data, open reception, and constantly follow the tracks of the process that receives the subsequent sound video data according to the time requirement of frame structure.
Wherein, the microprocessor of this second electronic equipment can adopt the ARM chip, and the wireless data sending chip is by the ARM chip configuration.Wherein, this wireless data sending chip acquiescence running parameter comprises: radio interface rate is 500Kbps, with the original video stream rate that is adapted to 256Kbps and the original audio stream rate of 15Kbps; Be free civilian intercom working frequency range and transmit and receive frequency range.
S402 carries out channel-decoding and CRC check successively to received packet;
Because transmit leg has carried out CRC check and chnnel coding to packet, therefore, after receiving packet, microprocessor can carry out corresponding channel-decoding and CRC check to received packet.Need to prove that channel coding method is that the first electronic equipment and the second electronic equipment are made an appointment, therefore, the second electronic equipment can be determined corresponding channel-decoding mode.
S403 when carrying video subframe head or audio frequency subframe in the correct packet of CRC check, recovers corresponding video subframe or audio frequency subframe in the frame;
Wherein, video subframe head is the 1st top 32 bits of video packets of data in the video subframe, by related algorithm (such as Comparison Method, i.e. front 32 numbers that bit is identical of front 32 bits of every frame data of receiving of statistics and set video frame header, if greater than the judgement threshold values of setting, think that then these frame data are first frame of video), whether the sequence of determining this video subframe head correspondence is correct, if correct, show to have found this video subframe head, and then can judge this video subframe head in the position of whole receiving sequence; Simultaneously, audio frequency subframe head is 32 bits of audio frequency subframe sound intermediate frequency packet front, by related algorithm (such as Comparison Method), whether the sequence of determining this audio frequency subframe head correspondence is correct, if correct, show to have found this audio frequency subframe head, and then can judge this audio frequency subframe head in the position of whole receiving sequence.
Wherein, can determine audio frequency subframe head and video subframe head by related algorithm, and record the moment that receives frame head, learn that namely transmit leg sends the moment of Frame, thereby can need to do according to this moment calculated for subsequent the moment of reception ﹠ disposal, can successfully set up sequential.
S404 when carrying the frame head of a frame in the correct packet of CRC check, recovers corresponding Frame;
Wherein, judge that the method for frame head is identical with the mode of judgement video subframe frame head, namely by carrying out relevant treatment with set frame head, can learn the frame head position, thereby recover this frame data.
S405 after recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in this Frame, and obtains original audio, video data piece after the CRC check success;
Because original audio, video data piece is added the CRC check code to transmit leg and scrambling is processed, treat framing audio, video data piece with formation, therefore, after recovering corresponding Frame, microprocessor is to corresponding audio, video data piece descrambling and CRC check in this Frame, and obtains original audio, video data piece after the CRC check success.Need to prove that the scrambling mode is that the first electronic equipment and the second electronic equipment are made an appointment, therefore, the second electronic equipment can be determined corresponding descrambling mode.
S406 is after acquiring all original audio, video data pieces, with the original audio, video data piece decompression decoding that obtains, to obtain corresponding original audio data and original video data.
Need to prove, every frame data comprise a video subframe (12 64 byte data bags) and an audio frequency subframe (1 64 byte data bag), can be to the decoding that decompresses of these frame data when getting access to frame data at every turn, obtain corresponding original audio data and original video data, can finish the transmission of these frame data.
Because the wireless data sending chip of transmit leg has carried out interpolation synchronization preamble and EIC equipment identification code, has been converted to modulation signal, formed radiofrequency signal after the operation such as mixing upconversion process received packet, therefore, in order to reduce corresponding packet, the recipient also should process accordingly to the radiofrequency signal that receives.Wherein, described wireless data sending chip can comprise such as Fig. 5 the processing procedure of received radiofrequency signal:
S501 carries out the mixing down-converted with accessed radiofrequency signal;
S502 is converted to baseband signal with formed signal after the mixing down-converted;
S503 according to synchronization preamble, carries out a decision process with this baseband signal, to be converted to the original series bit;
Be understandable that position decision process function is the function that existing wireless data sending chip has, and does not do at this and gives unnecessary details.
S504 judges whether the EIC equipment identification code of the EIC equipment identification code and this second electronic equipment self in this original series bit is identical, if so, and execution in step S505; Otherwise, do not deal with;
S505 puts into corresponding First Input First Output with this original series bit with data packet form, and then reports the microprocessor of this second electronic equipment.
When the EIC equipment identification code of the EIC equipment identification code in this original series bit and this second electronic equipment self is identical, the purpose electronic equipment that shows this packet is the second electronic equipment, this original series bit is put into corresponding First Input First Output with data packet form, and then report the microprocessor of this second electronic equipment; And when the EIC equipment identification code of the EIC equipment identification code in this original series bit and this second electronic equipment self was not identical, the destination that shows this packet was not the second electronic equipment, and do not deal with and get final product this moment.
In the present embodiment, receive the data of eating dishes without rice or wine as the second electronic equipment of recipient by the wireless data sending chip, and get access to the moment of video subframe head or audio frequency subframe head, require to open reception ﹠ disposal at follow-up delivery time according to the frame sequential; Then the audio, video data frame of receiving is carried out descrambling and the verification of CRC solution; At last audio, video data is carried out respectively video decode and audio decoder again, namely obtain the original audio, video data that transmit leg sends; And because special frame structure, the second electronic equipment can independently switch the transceiver mode of wireless data sending chip, and then realizes the wireless audio and video transfer of data of two-way interactive.
Be understandable that the second electronic equipment can be exported this original audio data and original video data after obtaining original audio data and original video data.
And, further, the microprocessor of the second electronic equipment can to self antenna reception to radiofrequency signal carry out low noise amplification after, be sent to the wireless data sending chip, so that the wireless data sending chip is processed received radiofrequency signal, with the outer noise of this filtering communication band, improve received signal to noise ratio, and then reduce the error rate of data receiver.
As fully visible, wireless audio and video data transmission procedure by above-mentioned the first electronic equipment and the second electronic equipment is as can be known: the first electronic equipment and the second electronic equipment all are in without time sequence status in the situation of not communicating by letter, under the signal intelligence at first receiving-transmitting sides set up the transmitting-receiving sequential according to calling party's sequential, then in communication process, keep this sequential, and owing to be provided with the Transmission Time Interval that switches transceiver mode for the wireless data sending chip in the frame structure, therefore can initiatively be changed by the either party of communicating pair the reiving/transmitting state of Voice ﹠ Video, realize like this audio video transmission of two-way mutual.
Description by above embodiment of the method, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out all or part of step of the described method of each embodiment of the present invention.And aforesaid storage medium comprises: the various media that can be program code stored such as read-only memory (ROM), random-access memory (ram), magnetic disc or CD.
Corresponding to top embodiment of the method, on the one hand, from the angle of transmit leg, the embodiment of the invention provides a kind of wireless audio and video data transmission device, be applicable to the microprocessor of the first electronic equipment, as shown in Figure 7, described wireless audio and video data transmission device can comprise:
Initial data acquisition module 710 is used for obtaining the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
Original data block forms module 720, is used for original video data and original audio data compressed encoding to obtaining, to form at least one original audio, video data piece;
Treat that the framing data block forms module 730, be used for described original audio, video data piece is added CRC check code and scrambling processing, treat framing audio, video data piece with formation;
Radiofrequency signal sending module 760, the respective radio-frequency signals that is used for described wireless data sending chip is exported sends by antenna.
In the technical scheme that the embodiment of the invention provides, Frame to be sent comprises video subframe and audio frequency subframe, and under the support of wireless data sending chip that can the transmission tone video data not relying on 3G network, reaches the effect that sends audio, video data; And, in frame structure, be provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, so that can carrying out transceiver mode in this Transmission Time Interval, the wireless data sending chip switches, and then under the support that does not rely on 3G network, realized the wireless audio and video transfer of data of two-way interactive.
Further, radiofrequency signal sending module 760 specifically is used for:
The respective radio-frequency signals that described wireless data sending chip is exported is carried out power amplification;
Radiofrequency signal after the power amplification is sent by antenna.
Wherein, 740 pairs of Frames to be sent of framing processing module comprise the framing processing procedure that makes up video subframe and audio frequency subframe at least, can comprise:
Add video subframe head for the video subframe in the Frame to be sent, the audio frequency subframe is added audio frequency subframe head;
Determine the packet of the first quantity that described Frame is corresponding, wherein, comprise in the packet of described the first quantity: the packets of audio data of the 3rd quantity that the video packets of data of the second quantity that described video subframe is corresponding and described audio frequency subframe are corresponding, described the second quantity and described the 3rd quantity sum are the first quantity;
For each packet in the described Frame adds the CRC check code and carries out chnnel coding, finish framing with this and process.
On the other hand, from recipient's angle, the embodiment of the invention also provides a kind of wireless audio and video data transmission device, is applicable to the microprocessor of the second electronic equipment, and as shown in Figure 8, described wireless audio and video data transmission device comprises:
Packet-receiving module 810 be used for to receive the packet that self wireless data sending chip reports;
Processing data packets module 820 is used for received packet is carried out corresponding channel-decoding and CRC check successively;
The audio frequency and video subframe is recovered module 830, when being used for packet when the CRC check success and carrying video subframe head or audio frequency subframe, recovers in the frame accordingly video subframe or audio frequency subframe;
Frame recovers module 840, is used for recovering corresponding Frame when the packet of CRC check success carries the frame head of a frame;
Original audio, video data piece recovers module 850, is used for after recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in the described Frame, to obtain original audio, video data piece after the CRC check success;
Initial data is recovered module 860, is used for after acquiring all original audio, video data pieces, the original audio, video data piece that obtains is decompressed decode, to obtain corresponding original audio data and original video data.
In the present embodiment, receive the data of eating dishes without rice or wine as the second electronic equipment of recipient by the wireless data sending chip, and get access to the moment of video subframe head or audio frequency subframe head, require to open reception ﹠ disposal at follow-up delivery time according to the frame sequential; Then the audio, video data frame of receiving is carried out descrambling and the verification of CRC solution; At last audio, video data is carried out respectively video decode and audio decoder again, namely obtain the original audio, video data that transmit leg sends; And because special frame structure, the second electronic equipment can independently switch the transceiver mode of wireless data sending chip, and then realizes the wireless audio and video transfer of data of two-way interactive.
Further, this wireless audio and video data transmission device can also comprise:
Output module is used for exporting described original audio data and original video data.
Further, this wireless audio and video data transmission device can also comprise:
Radio-frequency signal processing module, be used for to antenna reception to radiofrequency signal carry out low noise amplification after, be sent to the wireless data sending chip, so that the wireless data sending chip is processed received radiofrequency signal.
Be understandable that, the wireless audio and video data transmission device that is applicable to the wireless audio and video data transmission device in the microprocessor of the first electronic equipment and is applicable in the microprocessor of the second electronic equipment can be integrated in the electronic equipment, so that an electronic equipment not only can be used as initiatively transmit leg but also can be used as passive recipient.
For device or system embodiment, because it is substantially corresponding to embodiment of the method, so relevant part gets final product referring to the part explanation of embodiment of the method.Device described above or system embodiment only are schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, namely can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select according to the actual needs wherein some or all of module to realize the purpose of present embodiment scheme.Those of ordinary skills namely can understand and implement in the situation of not paying creative work.
In several embodiment provided by the present invention, should be understood that, disclosed system, apparatus and method not surpassing in the application's the spirit and scope, can realize in other way.Current embodiment is a kind of exemplary example, should be as restriction, and given particular content should in no way limit the application's purpose.For example, the division of described unit or subelement only is that a kind of logic function is divided, and during actual the realization other dividing mode can be arranged, and for example a plurality of unit or a plurality of subelement combine.In addition, a plurality of unit can or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.
In addition, institute's descriptive system, the schematic diagram of apparatus and method and different embodiment, in the scope that does not exceed the application, can with other system, module, technology or method in conjunction with or integrated.Another point, the shown or coupling each other discussed or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. a wireless audio and video data transmission method is characterized in that, is applicable to the first electronic equipment, and described method comprises:
The microprocessor of described the first electronic equipment obtains the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
To original video data and the original audio data compressed encoding that obtains, to form at least one original audio, video data piece;
Described original audio, video data piece is added CRC check code and scrambling processing, treat framing audio, video data piece with formation;
After each Frame to be sent being comprised at least the framing processing of structure video subframe and audio frequency subframe, data packet format according to defined in the frame structure that is provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, the described framing audio, video data piece for the treatment of corresponding to Frame to be sent is sent to the wireless data sending chip of self, and the respective radio-frequency signals that described wireless data sending chip is exported sends by antenna;
Wherein, described video subframe comprises the video data part in the framing audio, video data piece treated in the frame, and described audio frequency subframe comprises the voice data part in the framing audio, video data piece treated in the respective frame.
2. method according to claim 1 is characterized in that, the respective radio-frequency signals that described wireless data sending chip is exported sends by antenna, comprising:
The respective radio-frequency signals that described wireless data sending chip is exported is carried out power amplification;
Radiofrequency signal after the power amplification is sent by antenna.
3. method according to claim 1 and 2 is characterized in that, a Frame to be sent is comprised the framing that makes up video subframe and audio frequency subframe at least process, and comprising:
Add video subframe head for the video subframe in the Frame to be sent, the audio frequency subframe is added audio frequency subframe head;
Determine the packet of the first quantity that described Frame is corresponding, wherein, comprise in the packet of described the first quantity: the packets of audio data of the 3rd quantity that the video packets of data of the second quantity that described video subframe is corresponding and described audio frequency subframe are corresponding, described the second quantity and described the 3rd quantity sum are the first quantity;
For each packet in the described Frame adds the CRC check code and carries out chnnel coding, finish framing with this and process.
4. method according to claim 3 is characterized in that, described Frame wherein, comprises in 13 packets 13 packets should be arranged: 12 video packets of data that described video subframe is corresponding and 1 packets of audio data corresponding to described audio frequency subframe.
5. method according to claim 4 is characterized in that, the described frame structure that is provided with the Transmission Time Interval of described video subframe and described audio frequency subframe comprises:
The transmission time of each packet is 1.292ms, and the adjacent data parlor has the Transmission Time Interval of 150us, has the Transmission Time Interval of 627us between described video subframe and the described audio frequency subframe.
6. method according to claim 1 and 2 is characterized in that, described wireless data sending chip comprises the processing procedure of received packet:
Received packet is put into First Input First Output;
For the packet current waiting for transmission of determining from described First Input First Output adds synchronization preamble and EIC equipment identification code;
Be modulation signal with original series bits switch corresponding to described current packet waiting for transmission;
Described modulation signal is carried out the mixing upconversion process;
Formed radiofrequency signal after the mixing upconversion process is carried out power amplification, be applicable to the corresponding radiofrequency signal of antenna transmission with formation.
7. a wireless audio and video data transmission method is characterized in that, is applicable to the second electronic equipment, and described method comprises:
The packet that the wireless data sending chip of the microprocessor reception in the second electronic equipment self reports;
Received packet is carried out corresponding channel-decoding and CRC check successively;
When carrying video subframe head or audio frequency subframe in the packet of CRC check success, recover corresponding video subframe or audio frequency subframe in the frame;
When carrying the frame head of a frame in the packet of CRC check success, recover corresponding Frame;
After recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in the described Frame, and after the CRC check success, obtain original audio, video data piece;
After acquiring all original audio, video data pieces, with the original audio, video data piece decompression decoding that obtains, to obtain corresponding original audio data and original video data.
8. method according to claim 7 is characterized in that, described method also comprises:
Export described original audio data and original video data.
9. method according to claim 7 is characterized in that, described method also comprises:
The microprocessor of described the second electronic equipment to antenna reception to radiofrequency signal carry out low noise amplification after, be sent to the wireless data sending chip, so that the wireless data sending chip is processed received radiofrequency signal.
10. method according to claim 7 is characterized in that, described wireless data sending chip comprises the processing procedure of received radiofrequency signal:
Accessed radiofrequency signal is carried out the mixing down-converted;
Formed signal after the mixing down-converted is converted to baseband signal;
According to synchronization preamble, described baseband signal is carried out a decision process, to be converted to original bit sequence;
When the EIC equipment identification code of the EIC equipment identification code in the described original bit sequence and described the second electronic equipment self is identical, described original bit sequence is put into corresponding First Input First Output with data packet form, and then report the microprocessor of described the second electronic equipment.
11. a wireless audio and video data transmission device is characterized in that, is applicable to the microprocessor of the first electronic equipment, described wireless audio and video data transmission device comprises:
The initial data acquisition module is used for obtaining the original audio data that original video data that video acquisition unit gathers and audio collection unit gather;
Original data block forms module, is used for original video data and original audio data compressed encoding to obtaining, to form at least one original audio, video data piece;
Treat that the framing data block forms module, be used for described original audio, video data piece is added CRC check code and scrambling processing, treat framing audio, video data piece with formation;
The framing processing module is used for that each Frame to be sent is comprised the framing that makes up video subframe and audio frequency subframe at least and processes; Wherein, described video subframe comprises the video data part in the framing audio, video data piece treated in the frame, and described audio frequency subframe comprises the voice data part in the framing audio, video data piece treated in the respective frame;
The Packet Generation module, be used for after the Frame process processing of described framing processing module to be sent, according to the data packet format of defined in the frame structure that is provided with the Transmission Time Interval between described video subframe and described audio frequency subframe, the described framing audio, video data piece for the treatment of corresponding to Frame to be sent is sent to the wireless data sending chip of self;
The radiofrequency signal sending module, the respective radio-frequency signals that is used for described wireless data sending chip is exported sends by antenna.
12. a wireless audio and video data transmission device is characterized in that, is applicable to the microprocessor of the second electronic equipment, described wireless audio and video data transmission device comprises:
Packet-receiving module be used for to receive the packet that self wireless data sending chip reports;
The processing data packets module is used for received packet is carried out corresponding channel-decoding and CRC check successively;
The audio frequency and video subframe is recovered module, when being used for packet when the CRC check success and carrying video subframe head or audio frequency subframe, recovers in the frame accordingly video subframe or audio frequency subframe;
Frame recovers module, is used for recovering corresponding Frame when the packet of CRC check success carries the frame head of a frame;
Original audio, video data piece recovers module, is used for after recovering corresponding Frame, to corresponding audio, video data piece descrambling and CRC check in the described Frame, to obtain original audio, video data piece after the CRC check success;
Initial data is recovered module, is used for after acquiring all original audio, video data pieces, the original audio, video data piece that obtains is decompressed decode, to obtain corresponding original audio data and original video data.
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| CN110149171A (en) * | 2019-06-25 | 2019-08-20 | 昆腾微电子股份有限公司 | A kind of sending method, method of reseptance and the device of wireless audio data |
| CN110149171B (en) * | 2019-06-25 | 2022-04-26 | 昆腾微电子股份有限公司 | Wireless audio data sending method, receiving method and device |
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| WO2021208683A1 (en) * | 2020-04-16 | 2021-10-21 | 华为技术有限公司 | Control signal sending method, control signal receiving method, and related device |
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| CN114666525A (en) * | 2022-04-02 | 2022-06-24 | 中音讯谷科技有限公司 | Audio and video switching verification system based on ASIC structure |
| CN114666525B (en) * | 2022-04-02 | 2024-09-06 | 中音讯谷科技有限公司 | Audio and video switching verification system based on ASIC structure |
| CN116456054A (en) * | 2023-03-31 | 2023-07-18 | 深圳瑞新信息技术有限公司 | Audio and video data transmission system and method based on wireless network transmission |
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