Question

An adaptive quantizer varies its ___________ in accordance to input speech signal power.

(a) Level

(b) Step size

(c) Amplitude

(d) Frequency

This question was posed to me during a job interview.

This is a very interesting question from Quantization Techniques in section Speech Coding of Wireless/Mobile

Answer 1

The correct option is (b) Step size

To elaborate: An adaptive quantizer varies its step size in accordance to the input speech signal power. Its characteristics shrink and expand in time like an accordion.