January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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Modulation Methods 41 |
Amplitude modulation (AM)was discussed briefly in the previous section
and is the oldest form of telephony. Variants on the AM theme include double-
sideband suppressed carrier (DSBSC), single-sideband suppressed carrier (SSBSC),
which includes LSB and USB, and vestigial sideband (VSB). Figure 20-3 shows the
frequency spectrum for these modulation schemes when a 1-kHz audio sine wave
(Fig. 20-3A) modulates a 100-kHz sinusoidal subcarrier (Fig. 20-3B).
The standard AM signal (Fig. 20-3B) has a spectrum consisting of the 100-kHz
carrier and the sum and difference signals
(99
and 101 kHz) produced by the ...
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