December 2011
Intermediate to advanced
436 pages
18h 7m
English
book
Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
by Thad B. Welch, Cameron H.G. Wright, Michael G. Morrow
Content preview from Real-Time Digital Signal Processing from MATLAB® to C with the TMS320C6x DSPs, Second Edition, 2nd Edition
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232 CHAPTER 14. PROJECT 5: AM RECEIVERS
10
3
10
4
10
5
10
6
−40
−35
−30
−25
−20
−15
−10
−5
0
5
10
message frequency
carrier frequency
frequency (Hz)
|H(f)| (dB)
τ too big
τ about right
τ too small
Figure 14.7: The effectiveness of the LP filters used for envelope recovery as viewed in the
frequency domain.
Having made all of these observations, actual AM radios typically use a frequency selec-
tive, intermediate frequency (IF) stage prior to the envelope detector. This type of system is
called a “superheterodyne receiver” or simply a “superhet.” The IF-based system provides
significant end-to-end gain without amplifier instability/oscillation, as well as providing for
much better ...
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