Download Aptitude Crack
img not found img not found

Communication Systems - Engineering

Q1:

Companding is used

A to overcome quantising noise in PCM

B in PWM receivers to reduce impulse noise

C to protect small signals in PCM from quantising noise

D none of the above

ANS:C - to protect small signals in PCM from quantising noise

I believe answer is correct.

Because the idea is to have more levels at the lower levels than at high levels. True it does decrease S/N so some people might think option A is the right answer but more accurate is option C.