Synchrodyning of VSB and QAM final I-F signals supplied by separ

Details Synchrodyning of VSB and QAM final I-F signals supplied by separ Synchrodyning of VSB and QAM final I-F signals supplied by separ

1999-01-13

2000-08-15

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Angle modulation

375321, 348726, 348558, H04L 2714, H04N 5455

Patent

active

061047635

ABSTRACT:
A QAM/VSB digital television (DTV) receiver of plural conversion type uses the same circuitry up to a penultimate IF amplifier for receiving DTV signals no matter whether they use QAM or VSB modulation. The converter used for generating final IF signals when QAM modulation is received and the converter used for generating final IF signals when VSB modulation is received have respective mixers and respective local oscillators with separate automatic frequency and phase control. The use of such separate converters avoids a lock-out from VSB reception mode that otherwise can occur during the reception of DTV signals with VSB modulation.

REFERENCES:
patent: 5506636 (1996-04-01), Patel et al.
patent: 5715012 (1998-02-01), Patel et al.
patent: 5966188 (1999-10-01), Patel et al.

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