数据传输类型及调制解调器

Type of Baseband Transmission and Modem

介绍了计算机数据传输中的基带传输和频带传输 ;分别论述了基带传输的非归零编码—曼彻斯特编码、差分曼彻斯特编码的数字数据编码基本方法 ;频带传输的振幅键控 ,移频键控 ,移相键控等模拟信号编码方法 ;以移频键控方式的调制解调器 。

This paper mainly introduces the baseband transmission and the waveband transmission of computer data .In order to explain the baseband transmission, the methods of digital data coding of nonreturn to zero,manchester,diffence manchester in baseband transmission are introduced separately. The paper also describes the methods of analog signal coding of amplitude shift keying,frequency shift keying, phase shift keying etc. in waveband transmission. At last the paper explains the work principle of modem by use of frequency shift keying modem.