Question

A linear delta modulator is designed to operate on speech signals limited to 3.4 kHz. The sampling rate is 10 time the Nyquist rate of the speech signal. The step size is 100 m V. The modulator is tested with a this test signal required to avoid slope overload is

(a) 2.04 V

(b) 1.08 V

(c) 4.08 V

(d) 2.16 V

I had been asked this question at a job interview.

The query is from Digital Transmission topic in section EDC Overview of Electronic Devices & Circuits

Answer 1

Right choice is (b) 1.08 V

Easiest explanation: Amax = (0.1 x 68k)/(2000p) or 1.08V.