Answered: . Human voice contains frequency…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Q3 in a digital telephony network, the signal of human voice needs to be sampled and digitized before transmission. it is found that limiting the bandwidth of human voice to 3000 hz would be enough to ensure good-quality phone calls.

a. Human voice contains frequency components above 3000 Hz. How can
we ensure that the voice signal will only occupy a bandwidth of 3000
Hz?

b. The sampling rate is determined to be 50% higher than the Nyquist
sampling rate. Determine the sampling rate

c. A pulse-code modulation (PCM) scheme is used to represent the
digitized voice signal, where 10 bits are used for each sample.
Determine the data rate of a single voice call.

d. Time-division multiplexing (TDM) is used to aggregate a maximum of 40
voice calls in a telephone line. Determine the maximum data rate that
you can observe over a telephone line.

e. Determine the minimum required bandwidth of the telephone line that
can support a maximum of 40 phone calls.-

d. Explain what synchronization is in a TDM system and why do we need
synchronization in a TDM system.

e. Now, suppose a frequency division multiplexing (FDM) system is to be
built to support 40 phone calls in a given geographic area, where a
single sideband amplitude modulation scheme (SSB AM) with a
sufficiently large carrier frequency is used for each phone call. What is
the minimum required bandwidth for the FDM system that can avoid
mutual interference among the phone calls?

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