Question

In a pcm system the output of transmitting quantizer is digital.Then why it is further encoded?

Answer 1

Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals. It is the standard form of digital audioin computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps.

Pulse-code modulation