Television – Image signal processing circuitry specific to television – A/d converters
Patent
1995-06-07
1996-10-15
Peng, John K.
Television
Image signal processing circuitry specific to television
A/d converters
348725, 348475, 375247, 375324, 375329, H04N 708, H04N 544
Patent
active
055659306
ABSTRACT:
Digital signal receivers for detecting BPSK modulation of a suppressed carrier transmitted through the same channel as an analog television signal are described, in which the detected BPSK is digitized with an oversampling analog-to-digital converter prior to digital comb filtering for separating the BPSK from interfering analog television signal remnants. This is done to get an increased number of bits resolution from a relatively inexpensive flash converter so that the BPSK, which is of relatively low amplitude compared to maximally interfering analog television signal remnants, is not overwhelmed by quantizing noise. The oversampling analog-to-digital converter can be of sigma-delta type.
REFERENCES:
patent: 4612518 (1986-09-01), Gans et al.
patent: 4851841 (1989-07-01), Sooch
patent: 5093723 (1992-03-01), Yang
patent: 5229847 (1993-07-01), Gibson
patent: 5376894 (1994-12-01), Petranovich
Bolger Thomas V.
Limberg Allen L.
Yang Jiang
Murrell Jeffrey S.
Peng John K.
Samsung Electronics Co,. Ltd.
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