TS流的CRC译码器设计

Design of CRC decoder for transport stream

TS流是数字电视信号传输的主要方式,由于其采用的是广播方式且信道中存在着许多干扰,因此是不可靠传输。为了保证数据的正确性,一般需要进行信道编码。在发送端,TS流中通常采用的信道编码方式是CRC校验;在接收端进行译码。由于TS流数据量非常大,通常的软件译码方法不能满足要求。设计了一个基于FPGA的CRC译码器,速度快,并且具有很强的实时性。

Transport stream （TS） is a primary way to transmit digital television broadcast signals. Transport stream is designed for less reliable transmission, for it adopts broadcast mode and there is much interference in broadcasting channels. In order to ensure the accuracy of the received data and enable television image fluent playing, channel coding used at the transmitting end of the transport stream is CRC check and at the receiving end, the decoding is conducted. The amount of data is so large in the transport stream that decoding with software can not meet the needs. A CRC decoder based on FPGA is designed, which has the characteristics of fast speed and good real-time performance.