传统的数字信号解调方法存在着载波恢复、符号同步等问题，实现起来较为复杂。
The traditional digital signal demodulation method that realizes more complex has the problems of carrier recovery, symbol synchronization and so on.
调制解调器是在模拟和数字信号之间进行转换的设备。
A modem is a device that converts between analog and digital signals.
调制解调器是实现模拟信号和数字信号互相转变的设备，通过它用户的电脑才可连接因特网。
Modem enables the mutual conversion of analog signals and digital signals. Dial up connection is impossible without medom.
应用推荐