Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-12-31
1992-08-18
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358172, H04N 518, H04N 5208
Patent
active
051404230
ABSTRACT:
An aperture compensating circuit for enhancing the contour compensating in the picture and S/N ratio is disclosed. The aperture compensating circuit comprises a means for separating the luminance signal from the input signal, sample and hold means for sampling, holding and switching the luminance signal level input to the monitor with two times subcarrier frequency, 2 fs, a first control means for controlling the aperture edge quantity to emphasize the contour signal according to the value of the level output from the sample and hold means, a clamping means between the sample/hold means and a second control means to prevent the unstablization of the luminance signal level due to a distribution level between a source and a gate of the field effect transistor in the sample/hold means by clamping the source stage of said field effect transistor; and a second control means for controlling the aperture edge quantity in such a manner that when the edge quantity is controlled by the first control means, if the level of the luminance signal is high, the edge quantity is to be increased regardless of the difference of the luminance levels within the 1 H period, while if the level of the luminance signal is low, the edge quantity is to be decreased.
REFERENCES:
patent: 4110790 (1978-08-01), Wheeler
patent: 4558354 (1985-12-01), Tanaka
patent: 4811101 (1989-03-01), Yagi
patent: 4992877 (1991-02-01), Takayama
Britton Howard W.
Bushnell Robert E.
Samsung Electronics Co,. Ltd.
LandOfFree
Aperture compensating circuit for a video system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aperture compensating circuit for a video system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aperture compensating circuit for a video system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1253075