信道编码 1、信道编码的任务 经过按照MPEG进行数据压缩的信源编码,音频数字信号中剔除了冗余和不相关成分。这样的信号如果不再处理而直接进行传输,则它对传输信道中的干扰抵抗能力很弱。也就是说,出现比特差错造成的质量损伤,要比没有进行数据压缩的信号大得多。 所谓信道编码,是按照一定的规则,在信源编码后的数据流中,人为加进冗余,即补充差错保护,使信源编 Channel coding 1, the task of channel coding data compression in accordance with MPEG source coding, audio digital signal removed redundant and irrelevant components. Such a signal, if transmitted directly without further processing, is less resistant to interference in the transmission channel. In other words, quality errors caused by bit errors occur much larger than signals without data compression. The so-called channel coding is in accordance with certain rules, in the source encoded data stream, artificially add redundancy, that is, supplementary error protection, so that the source code