Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1997-08-20
1999-09-28
Peng, John K.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348608, 348609, 348624, 348497, 386 13, H04N 521
Patent
active
059596929
ABSTRACT:
The present invention relates in general to a digital-signal processing apparatus as well as a digital-signal processing method and, in particular, to a jitters removing apparatus as well as a jitters removing method. In the apparatus provided by the present invention, a TV signal received by a tuner or a video signal supplied by a VCR is fed to a moving-average correction circuit and a first FIFO circuit. In a correlation-value computing circuit, correlation between a carrier chrominance signal extracted by the moving-average correction and a carrier chrominance signal delayed by a second FIFO circuit by a predetermined time is found and a correlation value having a maximum absolute value is supplied to a quantization circuit. In the quanitization circuit, the quantization value is quantized to determine a class code. Then, coefficients for taps indicated by the class code are read out from a coefficient ROM unit and supplied to a linear first-order weighed-sum computing circuit. On the other hand, video signaling delayed by the first FIFO circuit are converted by a blocking circuit into a plurality of pixels signals appearing at the taps cited above and also supplied to the linear first-order weighted-sum computing circuit. In the linear first-order weighted-sum computing circuit, the pixel signals are multiplied by the respective coefficients and products resulting from the multiplication are added up to produce a weighted sum. In this way, a signal with jitters thereof removed is generated.
REFERENCES:
patent: 4296436 (1981-10-01), Achiha
patent: 4851904 (1989-07-01), Miyazaki
patent: 5499057 (1996-03-01), Kondo
patent: 5555465 (1996-09-01), Kondo
Kondo Tetsujiro
Nakaya Hideo
Frommer William S.
Peng John K.
Sajous Wesner
Smid Dennis M.
Sony Corporation
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