Television signal processing apparatus including rise time norma

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

358166, 358 37, H04N 964

Patent

active

048992216

ABSTRACT:
The coring circuit in a luminance processor has a characteristic which starts at the O input/O output point and extends linearly in both a positive and negative direction. The characteristic is implemented by a linear amplifier from which the input luminance signal is blocked until it has reached a predetermined threshold amplitude. Low amplitude, high frequency noise is therefore removed without causing overpeaking at high transition levels. The coating stage is preceded in the signal processor by a circuit which furnishes a peaking signal whose rise and fall time are independent of the amplitude of the transition. This circuit is implemented by feeding back the peaked luminance signal through a first filter which has a cut-off at 4 MHz and therefore furnishes a signal responsive both to the change in amplitude and the rate of change of that amplitude, and a second filter whose output is proportional only to the change in amplitude. The output of the second filter is subtracted from that of the first, so that the resultant gain control signal varies only as a function of the transition time. This gain control signal is then applied to a gain control amplifier in the forward loop. The feedback operates to keep the transition times constant.

REFERENCES:
patent: 3487163 (1969-12-01), Brugler
patent: 3715477 (1973-02-01), Olson et al.
patent: 4009334 (1977-02-01), Sypula
patent: 4071782 (1978-01-01), Vidovic
patent: 4142211 (1979-02-01), Faroudja
patent: 4249202 (1981-02-01), Perry et al.
patent: 4263616 (1981-04-01), Lee
patent: 4386369 (1983-05-01), Shanley, II et al.
patent: 4386370 (1983-05-01), Harwood et al.
patent: 4437124 (1984-03-01), Cochran
patent: 4441121 (1984-04-01), Harwood et al.
patent: 4509080 (1985-04-01), Lagoni et al.
patent: 4520396 (1985-05-01), Dischert et al.
patent: 4538236 (1985-08-01), Dischert et al.
patent: 4602278 (1986-07-01), Pritchard et al.
John P. Rossi, Digital Techniques for Reducing Television Noise SMPTE, Journal, Mar. 1978, vol. 87, pp. 134-140.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Television signal processing apparatus including rise time norma does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television signal processing apparatus including rise time norma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television signal processing apparatus including rise time norma will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-444770

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.