Television – Image signal processing circuitry specific to television – Combined noise reduction and transition sharpening
Patent
1995-06-06
1997-01-28
Peng, John K.
Television
Image signal processing circuitry specific to television
Combined noise reduction and transition sharpening
348613, 348677, 348691, 348711, H04N 514
Patent
active
055982255
ABSTRACT:
A video processor, having an input and an output, for compensating for accumulated phase and amplitude errors encountered during transmission of a video signal over a communications channel. The video processor includes a high-pass filter and amplifier, coupled to the input; a post-correction-phase-and-gain restorer; a wide-band-video-delay line coupled to the input; a pre-correction-comb-equalizer restorer; and a combining network, coupled to the output. The high-pass filter has a bandwidth characteristic which is approximately inverse to a low-pass characteristic encountered by the video signal during its transmission over the communications channel. The high-pass filter takes the video signal and outputs a filtered-video signal. The amplifier associated with the high-pass filter inverts the filtered-video signal. The post-correction-phase-and-gain restorer adjusts the inverted-filtered-video signal to generate a restored-video signal. The wide-band-video-delay line takes the video signal and delays the video signal by a half cycle at the subcarrier frequency to generate a delayed-video signal. The pre-correction-comb-equalizer restorer buffers the delayed-video signal. The combining network combines the restored-video signal and the delayed-video signal. The output of the combining network is a composite-video signal.
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Magma, Inc.
Murrell Jeffrey
Peng John K.
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