利用哈夫曼编码进行通信可以大大提高信道利用率，缩短信息传输时间，降低传输成本。但是，这要求在发送端通过一个编码系统对待传数据预先编码，在接收端将传来的数据进行译码（复原）。对于双工信道（即可以双向传输信息的信道），每端都需要一个完整的编/译码系统。(The use of Huffman coding can greatly improve the utilization of channel, shorten the time of information transmission and reduce the transmission cost. However, this requires the transmitting end to be precoded through a coding system, and the data that will be transmitted at the receiving end is decode (Fu Yuan). For a duplex channel (that is, a channel that can transmit information bi-directional), a complete coding / decoding system is needed at each end.)