Receiver with oversampling analog-to-digital conversion for digi

Television – Image signal processing circuitry specific to television – A/d converters

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Details

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

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