Method and apparatus for processing an amplitude modulated...

Details Method and apparatus for processing an amplitude modulated... Method and apparatus for processing an amplitude modulated...

2006-08-15

2006-08-15

Phu, Phuong (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S232000, C375S285000, C375S320000

Reexamination Certificate

active

07092465

ABSTRACT:
In order to protect against adjacent channel interference and the effects of weak signal in AM signal processing, pre- and post-AM demodulation filters (36and38) may be used where the bandwidth of both is varied in the same manner by a single controlling mechanism (34). In one embodiment, two or more cascaded filters (20, 24or22, 26or30,32) may be used for the pre- and post-demodulation filters where each of the cascaded filters has a same predetermined order and uses the same set of coefficients. In one embodiment, all cascaded filters are first order IIR filters, which reduces computation complexity. The use of a same set of coefficient for all the cascaded filters results in a same bandwidth for all filters and further reduces computation complexity. In an alternate embodiment, cascaded filters may be used for only one of the pre- and post-demodulator filters.

REFERENCES:
patent: 3760287 (1973-09-01), Harris
patent: 5155862 (1992-10-01), Hansen
patent: 5493717 (1996-02-01), Schwarz
patent: 2001/0008430 (2001-07-01), Carr et al.
patent: 2002/0136289 (2002-09-01), Shukla et al.
Sklar, “Digtial Communications Fundamentals and Applications”, published by Prentice-Hall, Inc., in 2001, pp. 1056, 1096-1071.

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