Question

Companding is used to

(a) Increase the information transmission rate

(b) Use only one carrier frequency to handle different signals

(c) To use different frequency bands for different signals

(d) To protect all small signals in PCM from quantizing noise

The question was posed to me in exam.

The above asked question is from TDM vs FDM topic in chapter Multiplexing and Multiple Access of Digital Communications

Answer 1

Correct choice is (d) To protect all small signals in PCM from quantizing noise

To elaborate: Companding is used to protect all small signals in PCM from quantizing noise.