Chapter 6: Single-Sideband Communications Systems – Review Notes

(Last Updated On: December 8, 2017)

Chapter 6: Single-Sideband Communications Systems

This is the summary notes of the important terms and concepts in Chapter 6 of the book "Electronic Communications System" by Wayne Tomasi. The notes are properly synchronized and concise for much better understanding of the book. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.


CHAPTER
6

SINGLE
– SIDEBAND COMMUNICATIONS SYSTEMS


Items

Definitions

Terms

1

A form of amplitude modulation
in which the carrier is transmitted at full power but only one of the
sidebands is transmitted.

AM Single-sideband Full Carrier
( SSBFC )

2

A form of amplitude modulation
in which the carrier is totally suppressed and one of the sidebands removed.

AM Single-sideband Suppressed
Carrier ( SSBSC )

3

A form of amplitude modulation
in which one sideband is totally removed and the carrier voltage is reduced
to approximately 10% of its unmodulated amplitude. Sometimes called
single-sideband reinserted carrier.

AM Single-sideband Reduced
Carrier ( SSBRC )

4

It is the reinserted carrier in
SSBRC for demodulation purposes.

Pilot Carrier

5

A form of amplitude modulation
in which a single carrier frequency is independently modulated by two
different modulating signals.

AM Independent Sideband ( ISB )

6

A form of amplitude modulation
in which the carrier and one complete sideband are transmitted, but only part
of the second sideband is transmitted.

AM Vestigial Sideband ( VSB )

7

________ is the picture portion
of a commercial television broadcasting signal.

VSB System

8

Are obvious advantages of
single-sideband suppressed- and reduced- carrier transmission over
conventional double- sideband full-carrier transmission?

Bandwidth Conservation and
Power Efficiency

9

This ratio determines the
degree of intelligibility of a received signal.

Signal-to-Noise Ratio

10

With double-sideband
transmission, the two sidebands and carrier may propagate through the
transmission media by different paths and therefore, experience different
transmission impairments. This condition is called ________.

Selective Fading

11

A condition in double-sideband
transmission where one sideband is significantly attenuated.

Sideband Fading

12

A form of selective fading
where there is a reduction of the carrier level of a 100%-modulated wave that
will make the carrier voltage less than the vector sum of the two sidebands.

Carrier-Amplitude Fading

13

A condition where the relative
positions of the carrier and sideband vectors of the received signal change,
causing a decided change in the shape of the envelope, causing a severely
distorted demodulated signal.

Carrier or Sideband Phase Shift

14

A product modulator where the
output signal is the product of the modulating signal and the carrier.

AM Modulator

15

Modulator circuits that
inherently remove the carrier during the modulation process.

DSBSC Modulators

16

A circuit that produces a
double-sideband suppressed-carrier signal.

Balanced Modulator

17

A balanced modulator that is
constructed with diodes and transformers. Sometimes called balanced lattice
modulator.

Balanced Ring Modulator

18

The small carrier component
that is always present in the output signal of a balanced modulator.

Carrier Leak

19

The operation of this balanced
modulator as the balanced ring modulator is completely dependent on the
switching action of diodes D1 through D4 under the influence of the carrier
and modulating signal voltages.

Balanced Bridge Modulator

20

A double-balanced
modulator/demodulator that produces an output signal that is proportional to
the product of its input signals.

LM1497 / 1596 Balanced
Modulator IC

21

The circuit where the carrier
is reinserted.

Linear Summer

22

Three methods for
single-sideband generation.

Filter, Phase-Shift, and Third
Method

23

Types of single-sideband
filters.

Crystal Lattice, Ceramic,
Mechanical, Saw Filters

24

A mechanically resonant
transducer that receives electrical energy, converts it to mechanical
vibrations, and then converts the vibrations back to electrical energy at its
output.

Mechanical Filter

25

Filters that use acoustic
energy rather than electro-mechanical energy to provide excellent performance
for precise bandpass filtering.

Surface Acoustic Wave Filters

26

Reflected energy that cancels
and attenuates the incident wave energy.

Heterodyne

27

Reflected energy that aids the
incident wave energy.

Constructive Interference

28

A transducer which launches the
acoustic wave in only one direction.

Unidirectional Transducer

29

Any difference between the
transmit and receive local oscillator frequencies produces a _______ in the
demodulated information signal.

frequency offset error

30

Fifty hertz or more offset is
distinguishable by a normal listener as a _______.

tonal variation

31

A narrowband PLL that tracks
the pilot carrier in the composite SSBRC receiver signal and uses the
recovered carrier to generate coherent local oscillator frequencies in the
synthesizer.

Carrier Recovery Circuit

32

An SSB receiver that uses a PLL
carrier recovery circuit and a frequency synthesizer to produce coherent
local and beat frequency oscillator frequencies.

Multichannel Pilto Carrier

33

Systems that provide narrowband
voice communications for land-mobile services with nearly the quality
achieved with FM systems and do it using less than one-third the bandwidth.

Amplitude-Compandoring Single-Sideband
( ACSSB )

34

The process of combining
transmissions from more than one source and transmitting them over a common
facility, such as metallic or optical fiber cable or a radio-frequency
channel.

Multiplexing

35

A transmission that can be used
to combine hundreds or even thousands of narrowband channels into single,
composite wideband channel without the channels interfering with each other.

Single-Sideband
Suppressed-Carrier Transmission

36

Single-sideband transmitters
are rated in ________ and ________.

Peak Envelope Power ( PEP )
& Peak Envelope Voltage ( PEV )

Complete List of Reviewers in Electronic Communications System per Chapter

Important List of Communications Engineering Materials

Chapter 6: Single-Sideband Communications Systems – Review Notes
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