Question

Consider the following statements with reference to a $PCM$ system:
$S_1:$ The combination of compression and expansion is called as companding.
$S_2:$ Companding is used to improve the $SNR$ of low frequency signals.
$S_3:$ More $BW$ is required to transmit a $PCM$ signal with companding compared to that of without companding.
Select the correct statement(s):

• A. $S_1$ and $S_3$ only
• B. $S_1.S_2$ and $S_3$
• C. $S_2$ and $S_3$ only
• D. $S_1$ only

Answer 1

The correct option is D $S_1$ only

• Companding is used to improve the $SNR$ of signals with low amplitudes but not of low frequency.
• Commpanding has no effect on $BW$ requirement.