电写通信是同时传送声音和手写图形信息的新型通信系统，它是将电话频带的一部分分配给低速数据（如300bit八）的调制解调器，用以进行手写图形信息的高效编码和传送，从而实现图声同时传输。一、电写通信系统的结构一般的电写通信终端装置的构成如图1所示，它包括音频通信用的 Electrical write communication is a new type of communication system that transmits both voice and handwritten graphic information at the same time. It is a modem that allocates part of the telephone band to low-speed data (eg 300bit) for efficient coding and transmission of handwritten graphic information, Acoustic transmission at the same time. First, the structure of the electrical write communication system General electrical write communication terminal device structure shown in Figure 1, which includes audio communications