Television – Image signal processing circuitry specific to television – Special effects
Patent
1994-05-13
1996-01-23
Groody, James J.
Television
Image signal processing circuitry specific to television
Special effects
348677, 348678, H04N 514
Patent
active
054868742
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-gain 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-gain 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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patent: 5299002 (1994-03-01), Fynayama
patent: 5402179 (1995-03-01), Okada
Groody James J.
Magma, Inc.
Murrell Jeffrey S.
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