Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1993-03-30
1994-12-13
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348620, 348713, H04N 5213, H04N 964
Patent
active
053733266
ABSTRACT:
A signal from an input terminal (1) is supplied to a video signal processing circuit (2) which derives a carrier chrominance signal. The carrier chrominance signal is supplied through a low-pass filter (3) to an A/D converter circuit (4). A signal converted by the A/D converter circuit (4) is supplied to a bandpass filter (5) which limits the band of the chrominance signal. A signal from the bandpass filter (5) is supplied to a decoder circuit (6) which alternately derives color difference signals (R-Y) and (B-Y). The signal from the decoder circuit (6) is supplied to a decimation filter (7) which effects a decimation. The signal thus decimated is supplied to a multiplexer (8) and thereby generated as 2-bit series data. A signal from the multiplexer (8) is supplied to a CNR (chroma noise reducer) circuit (9). Thus, the number of bits can be reduced without reducing the number of lines of a chroma signal and data gradation.
REFERENCES:
patent: 4868764 (1989-09-01), Richards
patent: 4910586 (1990-03-01), Sharpe
patent: 5047838 (1991-09-01), Murakami
patent: 5140408 (1992-08-01), Kaite
Nojima Satoshi
Senuma Toshitaka
Groody James J.
Hsia Sherrie
Maioli Jay H.
Sony Corporation
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