Question

In Adaptive Delta Modulation, the slope error reduces and ___________

(a) Quantization error decreases

(b) Quantization error increases

(c) Quantization error remains same

(d) None of the mentioned

This question was posed to me in an online interview.

I would like to ask this question from Quantization Techniques topic in section Speech Coding of Wireless/Mobile

Answer 1

Right option is (b) Quantization error increases

Easiest explanation: ADM reduces slope error, at the expense of increasing quantizing error. This error can be reduced by using a low-pass filter.