The basic idea of channel coding is to add some code elements to the information code elements that transmit speech, and then interweave and recombine them. The newly added code elements are called error correcting code or redundant code.
In the process of signal transmission, when the digital signal is lost in pieces or generates code errors, the number of useful code element loss will be reduced due to the existence of error correcting code element and the adoption of interweaving technology.
Channel coding can be understood as a \"doping\" method, of course, the \"impurity\" of mixing people is finally removed.
For speech analog information sources, information source coding is also called speech coding technology, which is to complete A\/D transformation and compress the data rate of the transmitted original information. The channel coding technology is to increase the error detection and error correction function of data transmission, so as to improve the reliability of digital information transmission.