Television – Receiver circuitry – Demodulator
Patent
1998-05-21
1999-09-28
Kostak, Victor R.
Television
Receiver circuitry
Demodulator
348558, H04N 5455
Patent
active
059596996
ABSTRACT:
A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The tuner supplies a final IF signal in a 6-MHz-wide frequency band, the lowest frequency of which is not appreciably more than 2.69 MHz. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband, with the 2.69 MHz difference between the carrier frequencies of QAM and VSB signals being taken into account in the digital synchrodyning circuitry. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control signals developed in the digital circuitry to a local oscillator of the tuner.
REFERENCES:
patent: 5506636 (1996-04-01), Patel et al.
patent: 5565932 (1996-10-01), Citta et al.
patent: 5636250 (1997-06-01), Scarpa
patent: 5642382 (1997-06-01), Juan
patent: 5715012 (1998-02-01), Patel et al.
Limberg Allen LeRoy
Patel Chandrakant B.
Bushnell Esq. Robert E.
Kostak Victor R.
Samsung Electronics Co,. Ltd.
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