Question

Quantization noise can be reduced by ________ the number of levels.

(a) Decreasing

(b) Increasing

(c) Doubling

(d) Squaring

I had been asked this question during an internship interview.

This interesting question is from Pulse Code Modulation topic in section Formatting and Baseband Modulation of Digital Communications

Answer 1

Right answer is (b) Increasing

The explanation: The process of quantization replaces the true signal with the approximation(quantization noise). By increasing the number of quantization level the quantization noise can be reduced.