Method and apparatus for demodulating QAM and VSB signals

Details Method and apparatus for demodulating QAM and VSB signals Method and apparatus for demodulating QAM and VSB signals

1994-09-08

1997-09-30

Chin, Stephen

Pulse or digital communications

Receivers

Amplitude modulation

375323, 455204, H03C 152

Patent

active

056732937

ABSTRACT:
Method and apparatus for providing a QAM, a VSB, and a joint QAM/VSB demodulator are described. The describe demodulators are designed to minimize the amount of duplicated circuitry required to implement a joint QAM/VSB demodulator capable of performing the functions of the disclosed individual QAM and VSB demodulators. All digital architectures are used for each of the described demodulators to facilitate their combination into the described joint VSB/QAM demodulator. The described demodulators are suitable for demodulating, e.g, advanced or high definition television signals modulated using QAM or VSB modulation techniques.

REFERENCES:
patent: 3851252 (1974-11-01), Karnaugh et al.
patent: 4972357 (1990-11-01), Morel
patent: 5067140 (1991-11-01), Weinert
patent: 5410368 (1995-04-01), Krishnamurthy et al.
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5479449 (1995-12-01), Patel et al.
patent: 5506636 (1996-04-01), Patel et al.

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