Digital Comm.Sys. A analog communication system transfers analog msg signals. A digital communication system transfers digital msg signals. Advantages of digital comm. 1.In long-distance transmission,we may regenerate the signal to clear the noise periodically 2. It is very easy to compress the digital msg signal. 3. It works well for different msg and support networking. 4. Digital system are cheap and easy to implement with the development of VLSI and DSP So,analog msgs are often converted to digital form,then transferred by a digital sys. UESTC-Introduction Prof李晓峰 6