调制解调器（即Modem），是计算机与电话线之间进行信号转换的装置，由调制器和解调器两部分组成，调制器是把计算机的数字信号（如文件等）调制成可在电话线上传输的声音信号的装置，在接收端，解调器再把声音信号转换成计算机能接收的数字信号。-Modem (Modem), is a computer and telephone line between a signal conversion device that consists of two parts, modulator and demodulator and modulator is to put the computer s digital signals (such as files, etc.) can be made in line on the transmission of sound signal of the device, at the receiving end, the Modem again the sound signal into computer can receive digital signals.