现代社会商业通信和私人通信的数量越来越多、复杂性越来越高、时效性越来越强,因而需要具有更多功能、更有效、更快的通信设备,需要邮电部门提供新的通信技术,这样,图文传真(FAX)应运而生。图文传真是在发送机一端对所需要传输的图文进行光电扫描,将此光信息转换成电信号,并加以调制,再通过有线或无线传输给接收机,而接收机将此信号转 In modern society, the number of commercial and private communications is increasing, the complexity is getting higher and higher, and the timeliness is getting stronger. Therefore, communication devices with more functions, more efficient and faster are needed, and the post and telecommunications departments are required to provide new Communication technology, so fax (FAX) came into being. Teletext is one side of the transmitter to the need to transfer the photoelectrical scanning, the optical information into electrical signals, and to be modulated, and then transmitted to the receiver by cable or wireless, and the receiver will turn this signal