CN102891995A - Wireless AV (audio/video) acquisition system - Google Patents
Wireless AV (audio/video) acquisition system Download PDFInfo
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- CN102891995A CN102891995A CN2012104242782A CN201210424278A CN102891995A CN 102891995 A CN102891995 A CN 102891995A CN 2012104242782 A CN2012104242782 A CN 2012104242782A CN 201210424278 A CN201210424278 A CN 201210424278A CN 102891995 A CN102891995 A CN 102891995A
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Abstract
The invention discloses a wireless AV (audio/video) acquisition system, and mainly aims at solving the problems of large delay, poor picture quality and the like of the existing wireless AV acquisition system. The wireless AV acquisition system comprises an audio acquisition device, a video acquisition device, an audio A/D (analog/digital) conversion module, a video A/D (analog/digital) module, a coding processor, a digital up-converter and a radio frequency transmitter. According to the system, key algorithms including an AV coding compression algorithm and a wireless modulation algorithm are integrated on one FPGA (field programmable gate array) chip, so that the transmission delay of the system is greatly reduced; an advanced H.264 video coding compression algorithm is adopted, so that the picture quality is improved, the compression ratio of code streams is increased, and the pressure of the wireless transmission rate is reduced; and an excellent wireless modulation algorithm COFDM is adopted, so that the transmission quality and the transmission distance of the system under severe conditions are improved. The wireless AV acquisition system has the characteristics of good picture quality, long transmission distance, small system delay and the like.
Description
Technical field
The present invention relates to the audio/video encoding/decoding technical field, particularly relate to a kind of wireless audio and video acquisition system.
Background technology
Development along with audio/video encoding/decoding algorithm and wireless communication technique, the transmission technology of wireless audio and video has also obtained huge progress, the application of wireless audio and video is also more and more wider, cruise etc. such as safety-security area, ocean, market is also more and more harsher to the requirement of the required bandwidth of audio-video collection and delay.
Existing solution adopts the integrated scheme of separating chips to realize the collection of wireless audio and video more, because the performance limitations of independent chip and plate level connect the speed restriction that brings, greatly reduces the performance of wireless audio and video acquisition system.
Summary of the invention
For above-mentioned deficiency, the invention provides a kind of wireless audio and video acquisition system, it not only can improve the overall performance of system, and can reduce the speed restriction that the connection of plate level brings.
The present invention solves the technical scheme that its technical problem takes: a kind of wireless audio and video acquisition system, it is characterized in that, comprise audio collecting device, video capture device, audio A/D modular converter, the video a/d modular converter, encode processor, digital up converter and radio frequency sending set, the input of described audio A/D modular converter is connected with audio collecting device, output is connected with the input of encode processor, the input of described video a/d modular converter is connected with video capture device, output is connected with the input of encode processor, the output of described encode processor is connected with the input of digital up converter, and the output of described digital up converter is connected with the input of radio frequency sending set; Described encode processor is arranged on the fpga chip.
Preferably, described encode processor comprises the audio coding module, H.264 encoder, TS stream packing device and COFDM modulation module, the input of described audio coding module is connected with the output of audio A/D modular converter, output is connected with the input of TS stream packing device, the input of described H.264 encoder is connected with the output of video a/d modular converter, output is connected with the input of TS stream packing device, the output of described TS stream packing device is connected with the input of COFDM modulation module, and the output of described COFDM modulation module is connected with the input of digital up converter.
Preferably, described audio collecting device comprises microphone.
Preferably, described video capture device comprises camera.
Preferably, described audio coding module adopts MP3 audio coding algorithm.
Preferably, described digital up converter adopts the AD9857 chip.
Preferably, described audio A/D modular converter adopts the PCM1808 chip.
Preferably, described video a/d modular converter adopts the SAA7113 chip.
Good effect of the present invention is, the present invention has reduced the transmission delay of system greatly by these crucial algorithms such as integrated audio/video coding algorithm and wireless-modulated algorithm on fpga chip; Adopt advanced Video coding compression algorithm (H.264 algorithm), increased the compression ratio of code stream when improving image quality, reduced the pressure of wireless transmission rate; Adopted outstanding wireless-modulated algorithm COFDM, increased transmission quality and the transmission range of system under mal-condition, had that image quality is good, characteristics such as long transmission distance and system delay are little.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of wireless audio and video acquisition system of the present invention, it comprises audio collecting device, video capture device, audio A/D modular converter, the video a/d modular converter, encode processor, digital up converter and radio frequency sending set, the input of described audio A/D modular converter is connected with audio collecting device, output is connected with the input of encode processor, the input of described video a/d modular converter is connected with video capture device, output is connected with the input of encode processor, the output of described encode processor is connected with the input of digital up converter, and the output of described digital up converter is connected with the input of radio frequency sending set; Described encode processor is arranged on the fpga chip.
Wherein, described encode processor comprises the audio coding module, H.264 encoder, TS stream packing device and COFDM modulation module, the input of described audio coding module is connected with the output of audio A/D modular converter, output is connected with the input of TS stream packing device, the input of described H.264 encoder is connected with the output of video a/d modular converter, output is connected with the input of TS stream packing device, the output of described TS stream packing device is connected with the input of COFDM modulation module, and the output of described COFDM modulation module is connected with the input of digital up converter.
Described audio collecting device adopts microphone.
Described video capture device adopts camera.
Described audio coding module adopts MP3 audio coding algorithm.
Described digital up converter adopts the AD9857 chip.
Described audio A/D modular converter adopts the PCM1808 chip.
Described video a/d modular converter adopts the SAA7113 chip.
The course of work of described wireless audio and video acquisition system is as follows: the original analog audio signal of microphone collection is through forming digital signal after the collection of PCM1808 chip, the audio coding module is extracted buffer memory with voice data and is utilized MP3 audio coding compression algorithm that voice data is carried out compressed encoding according to the characteristics of digital signal, then passes to TS stream packing device; Simultaneously, the signal transition of camera collection becomes composite video signal (CVBS) to pass to the SAA7113 chip of coded excitation subsystem, and the SAA7113 chip becomes the BT656 signal of standard with the CVBS signal transition of input and pass to H.264 encoder to do further processing.H.264 encoder receives the BT656 digital video signal from SAA7113, and the luminance and chrominance information in this signal extracted be transformed into the YUV420 form, and the code stream of YUV420 form further compressed form H.264 code stream and pass to TS stream packetization module.The audio code stream of process capturing and coding and the video codes behind the compression coding fail to be convened for lack of a quorum further packaged, form one by one TS stream packets, and each packet comprises 188 byte.Each packet is divided into again header packet information, supplementary, video/audio/data code stream, padding data.Wherein corresponding different ID number of different code stream is placed in the header packet information for these ID numbers and identifies for receiving terminal TS stream decoder.Further delivering to the COFDM modulation module through the TS stream packets after the packing modulates.The COFDM modulation module is supported the variable channel bandwidth of 1.25MHz, 2MHz, 4MHz and 8MHz, realizes the reasonable utilization of channel width.The COFDM modulation module is modulated the TS stream of input and is formed the modulation signal that meets the DVBT standard.Signal after the modulation converts radiofrequency signal to through digital up converter, launches through radio frequency sending set again.Digital up converter adopts stable AD9857 chip, and the centre frequency of output signal is 36.166MHz, and the bandwidth of signal determines that by the COFDM modulation module these four kinds of channel widths of 1.25MHz, 2MHz, 4MHz and 8MHz are arranged.
The problems such as the delay that the present invention has mainly solved existing wireless audio and video acquisition system is large, image quality is bad; Provide a kind of audio/video coding compression algorithm and wireless-modulated algorithm have been integrated in system scheme on the fpga chip, the delay of having introduced when having avoided adopting the individual chips Integrated Solution; In addition, use advanced video coding algorithm H.264 and outstanding wireless-modulated algorithm COFDM, the characteristics such as this scheme has that image quality is good, long transmission distance, system delay are little.The present invention has adopted H.264 coding compression algorithm, and H.264 the excellent characteristic of coding compression algorithm can have higher compression ratio under image quality of the same race, thereby reduces the bandwidth pressure of system; Adopted COFDM wireless modulation-demodulation algorithm, COFDM wireless modulation-demodulation algorithm has extremely strong antijamming capability, availability of frequency spectrum high, help to improve the transmission range of system, utilize fpga chip that audio/video coding compression algorithm and COFDM wireless-modulated algorithm are integrated on the same chip, when improving the entire system performance, reduced the plate level and connected the speed restriction that brings.
Claims (8)
1. wireless audio and video acquisition system, it is characterized in that, comprise audio collecting device, video capture device, audio A/D modular converter, the video a/d modular converter, encode processor, digital up converter and radio frequency sending set, the input of described audio A/D modular converter is connected with audio collecting device, output is connected with the input of encode processor, the input of described video a/d modular converter is connected with video capture device, output is connected with the input of encode processor, the output of described encode processor is connected with the input of digital up converter, and the output of described digital up converter is connected with the input of radio frequency sending set; Described encode processor is arranged on the fpga chip.
2. a kind of wireless audio and video acquisition system according to claim 1, it is characterized in that, described encode processor comprises the audio coding module, H.264 encoder, TS stream packing device and COFDM modulation module, the input of described audio coding module is connected with the output of audio A/D modular converter, output is connected with the input of TS stream packing device, the input of described H.264 encoder is connected with the output of video a/d modular converter, output is connected with the input of TS stream packing device, the output of described TS stream packing device is connected with the input of COFDM modulation module, and the output of described COFDM modulation module is connected with the input of digital up converter.
3. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that described audio collecting device comprises microphone.
4. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that described video capture device comprises camera.
5. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that, the audio coding module adopts MP3 audio coding algorithm.
6. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that, described digital up converter adopts the AD9857 chip.
7. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that, described audio A/D modular converter adopts the PCM1808 chip.
8. a kind of wireless audio and video acquisition system according to claim 1 is characterized in that, described video a/d modular converter adopts the SAA7113 chip.
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| CN2012104242782A CN102891995A (en) | 2012-10-30 | 2012-10-30 | Wireless AV (audio/video) acquisition system |
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| CN2012104242782A CN102891995A (en) | 2012-10-30 | 2012-10-30 | Wireless AV (audio/video) acquisition system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105208331A (en) * | 2015-09-18 | 2015-12-30 | 广东实联医疗器械有限公司 | Video capturing, transmitting and enhancing circuit for medical camera system |
| CN112511478A (en) * | 2021-02-04 | 2021-03-16 | 湖南国科锐承电子科技有限公司 | Voice storage and transmission device and method based on FPGA |
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