Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-10-23
1998-09-15
Peng, John K.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348621, 348624, 348630, H04N 521
Patent
active
058086960
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to information hardware, and particularly, to video signal regenerators in color television.
BACKGROUND ART
Knowm in the art is an aperture equalization device comprising a high-pass filter for transmitting high-order frequencies (SU, A, 558418). Concurrently with an increase in the steepness of video signal fronts, such device increases a high-frequency noise level.
Also known in the art is a video signal regenerator constructed as a microcircuit wherein two channels of relatively narrow-band input signals comprise video holding samplers whose driving inputs are electrically connected to video signal front detectors, while the third channel for processing a relatively wider-band video signal includes a delay line for leveling time position of video signal fronts at the outputs of all the three processing channels (JEEE Transaction on Consumer Electronics, Junke K. Four Standard Colour Decoder with Picture Improvement, 1983, CE-29, No. 4, p. 451-461).
This device regenerates only two of three input video signals. And the degree of regeneration is not sufficiently high, since the steepness of narrow-band input video signal fronts are not raised but to the steepness of the front of a relatively widest-band video signal. Furthermore, the degree of regeneration is not complete, since the video signals that are regenerated are not cleared of the high-frequency interference.
DISCLOSURE OF INVENTION
The present invention is based on the problem to provide a video signal regenerator in color television wherein a substantial decrease in rise time of regenerated video signals would be provided by a modified arrangement of basic elements of the regenerator.
This problem is resolved in that the video signal regenerator in color television comprising two video signal regeneration channels each of which has a video signal front detector electrically connected to a driving input of a video holding sampler according to the present invention also comprises a third video signal regeneration channel having an input receiving a video signal of a passband wider than that of other video signals, which channel being similar to the other regeneration channels and also compising a video signal front detector electrically connected to the driving input of the video holding sampler.
It is advantageous to have electrical connection of the video signal front detector with the video holding sampler in each regeneration channel through a common OR circuit having inputs connected to the outputs of the video signal front detectors and the output connected to the driving inputs of the video holding samplers.
The video signal front detectors of all the regeneration channels may be combined with the OR circuit to form an integral picture edge detector the output of which is fed with a video signal of a wider band than the other video signals, the input of the picture edge detector may be fed with a luminance video signal, while the video input of each video holding sampler may be fed with a color video signal.
It is advantageous that the output of the OR circuit be coupled with the input of a squaring circuit the output of which be connected to the driving inputs of all the video holding samplers.
The video signal regenerator may appropriately comprise a low-pass filter having an output connected to the video input of at least one video holding sampler.
Each video signal regeneration channel may comprise a first adder having one input whereto a video signal is applied, while the other input is connected to the output of the video holding sampler, an integrating circuit, the video input thereof being connected to the output of the first adder, while the zero adjustment input being connected to the output of the squaring circuit or of the OR circuit, and a second adder, the inputs thereof being connected to the output of the integrating circuit and of the video holding sampler, while the output thereof being the output of a video signal regeneration channel.
Also, each video signal regenerat
REFERENCES:
patent: 4148059 (1979-04-01), Dillon et al.
patent: 4683490 (1987-07-01), Strolle et al.
patent: 4979041 (1990-12-01), Schreiber
patent: 5150204 (1992-09-01), Yamazaki
patent: 5235410 (1993-08-01), Hurley
patent: 5412423 (1995-05-01), Ohashi
patent: 5483294 (1996-01-01), Kays
Murrell Jeffrey S.
Peng John K.
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