Exam Questions Papers - Engineering

Q1:

A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. The number of quantization levels required to reduce the quantization noise by a factor of 4 would be

A 1024

B 512

C 256

D 64

ANS:B - 512

To reduce quantization noise by 4 No. of levels should increase by 2 Thus 512 levels are required.