Method and system for synchronously transmitting audio/video signal
A technology of audio signal and signal synchronization, applied in the field of modulation of audio signal, superimposition and transmission in synchronization with video signal, can solve the problems of occupying transmission channels and waste, and achieve the effect of synchronization
Inactive Publication Date: 2011-11-09
SHENZHEN COSHIP ELECTRONICS CO LTD
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Problems solved by technology
The collection, processing and transmission of this kind of audio signal are carried out independently, requiring independent audio and video channels respectively, occupying additional transmission channels, and also requiring additional audio processing circuits, resulting in waste
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[0017] The present invention adopts the principle of modulation and demodulation to modulate the collected audio signal that has been filtered and processed on a carrier signal of a certain frequency, and then superimpose it on a CVBS signal (Composite Video Broadcast Signal or Composite Video Blanking and Sync, Composite Video Broadcasting Signal or composite video blanking and synchronization, hereinafter referred to as CVBS signal.) On the synchronization signal, the delay circuit realizes synchronization with the video signal before transmission. The method does not need to add additional audio processing circuits, does not occupy additional transmission channels, and easily realizes the synchronization of audio and video.
[0018] Such as figure 1 Shown is a flow chart of a method for synchronous transmission of audio and video signals according to an embodiment of the present invention, and the process steps are as follows:
[0019] S101. Perform filtering processing on...
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The invention provides a method and a system for synchronously transmitting an audio / video signal, which can truly realize the compounding and synchronous output of the audio / video signal. The system comprises a low pass filter, a signal modulator, a signal superposition device and a video amplification buffer. The method comprises the following steps of: performing low pass filtering processing on an initially acquired audio signal by using the low pass filter and then modulating the processed audio signal and a sinusoidal carrier signal in the signal modulator; performing superposition on the modulated signal and a composite synchronizing signal in a CCD video output signal in the signal superposition device; performing video amplification buffer on the superposed signal by using the video amplification buffer to obtain an audio / video composite signal; and separating the audio / video composite signal. The method and the system can truly realize the audio / video composite output and better realize the synchronization of the video signal and the audio signal.
Description
technical field [0001] The invention relates to the technical field of electronic monitoring, in particular to a method and a system for modulating and superimposing audio signals and transmitting them synchronously with video signals. Background technique [0002] At present, in most cameras and TV systems, analog video or analog audio is transmitted separately, such as S terminal AV output, CVBS (Composite Video Broadcast Signal or Composite Video Blanking and Sync, composite video broadcast signal or composite video blanking and synchronization, hereinafter referred to as CVBS signal.) Signals, etc. are separated output. In the prior art, the acquisition, processing, and transmission of analog audio signals and the acquisition, processing, and other processes of analog video signals are performed independently. In mainstream audio and video products, the collected video signal and audio signal are transmitted as independent channels to a video and audio codec chip for AD...
Claims
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IPC IPC(8): H04N9/78
Inventor 姚钤文
Owner SHENZHEN COSHIP ELECTRONICS CO LTD