Composite video broadcast signal decoding device and method with time division multiplexing

Abstract

The invention relates to the fields of video coding and decoding and discloses a composite video broadcast signal decoding device and method with time division multiplexing. According to the composite video broadcast signal decoding device and method with the time division multiplexing, a control signal which is generated by a signal switching controller and is used for periodically switching signal channels is used for indicating a signal selector to select a CVBS (composite video broadcast signal) of a channel to be processed currently from the analog CVBSs of a plurality of channels, and the CVBS of the channel to be processed currently is also decoded so as to obtain a brightness signal and two color difference signals. Therefore, some control logics of time division multiplexing are added according to the execution mode disclosed by the invention on the basis of a traditional single-channel composite video broadcast signal decoding device, decoded data paths are used in a time-sharing way, the realization cost of the data paths is not increased, but only some control paths are added. The simultaneous decoding of a plurality of paths of composite video broadcast signals is realized, and the cost is greatly lowered. The composite video broadcast signal decoding device and method with the time division multiplexing have very good application in the field of decoding composite video broadcast signals in a digitizing way.

Description

technical field [0001] The invention relates to the field of video encoding and decoding, in particular to a time-division multiplexed composite video broadcast signal decoding device and method. Background technique [0002] Composite video broadcast signal, also known as composite video blanking and synchronization (Composite Video Broadcast Signal or Composite Video Blanking and Sync, referred to as "CVBS"), is an analog TV program (picture) signal combined with a sound signal and modulated to a radio frequency A format preceding the carrier. CVBS is a widely used standard, also known as baseband video or RCA video. It transmits data in an analog waveform, including two color difference (hue Cb and saturation Cr) signals, one brightness (Y) signal, and synchronizes them in the blanking pulse and transmits them with the same signal. Traditional CVBS signal decoding equipment lacks a single processing chip and needs multiple analog processing modules to complete decoding,...

AI Technical Summary

Problems solved by technology

This structure can meet the needs of CVBS single-chip decoding, but a single decoder can only decode a single channel of CVBS signals. For many applications that need to decode two or more CVBS signals at the same time, such as the field of security monitoring, only simple The increase in the number of decoders to solve, increases the implementation cost

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