Question

The output SNR can be made independent of input signal level by using

(a) Uniform quantizer

(b) Non uniform quantizer

(c) Uniform &  Non uniform quantizer

(d) None of the mentioned

I have been asked this question by my college professor while I was bunking the class.

The above asked question is from Uniform and Non Uniform Quantization in portion Formatting and Baseband Modulation of Digital Communications

Answer 1

Right answer is (b) Non uniform quantizer

Explanation: The weak signal experiences poorer SNR compared to high level signals. So if non uniform quantizer like logarithmic compressor is used the SNR ratio can be made independent of input signal level.