Multi-program PCR correction system and multi-program PCR correction method

Abstract

The invention provides a multi-program PCR correction system and a multi-program PCR correction method. The system comprises a code rate regulation module, an arbitration module, a PCR correction control module, a PCR incremental calculation module, a new PCR calculation module and a packet gap calculation module. The method comprises the following steps of: outputting TS packets of a constant code rate, extracting TS packet information and outputting the extracted information; after arbitration treatment, outputting the TS packet information which needs to be processed currently, and initiating a PCR correction initial command; controlling and coordinating the PCR incremental calculation module, the new PCR calculation module and the packet gap calculation module to complete PCR correction treatment, wherein the PCR correction treatment comprises ' counting TS packets of each channel, executing neighbor packet gap calculation and PCR incremental calculation for the currently corrected PCR PID, obtaining a corrected PCR value of the currently processed PCR packet, and correcting a packet gap value'; allocating the corrected PCR value to corresponding channels; and substituting the original PCR value with the corrected PCR value, and outputting. By means of the system and the method provided by the invention, real-time processing for multi-channel and multi-program PCR can be achieved, less resources are consumed, and better fault tolerance features for abnormal TS streams are achieved.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a multi-program PCR correction system and method, which are applied to radio and television front-end equipment products. Background technique [0002] As the most basic synchronization basis in the TS stream, the program clock reference (PCR) enables the decoded video output of the digital television receiver to be locked to the video signal source at the input end of the encoder. Therefore, the accuracy of the PCR plays a very important role in the smooth operation of the digital TV system; however, in the digital TV system, the transport stream (hereinafter referred to as TS) will cause TS in the transmission process due to factors such as unstable network transmission and multiplexing. There is a certain error between the PCR value in the stream and the actual PCR value received by the decoder. This error will cause the clock recovered by the receiver to jitter or ...

AI Technical Summary

Problems solved by technology

Because the software cannot control the precise TS stream correction time, this method is usually poor in correction accuracy; (2) The hardware method is used to realize PCR correction

This method is the best in terms of correction accuracy, but each TS stream of this method must correspond to a set of hardware correction circuits, which is costly and complex in hardware design, and cannot support PCR correction in the case of multi-stream processing in practical applications.

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