Dynamically controlled horizontal peaking system

Details Dynamically controlled horizontal peaking system Dynamically controlled horizontal peaking system

1982-04-30

1984-03-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 514, H04N 521

Patent

active

044371233

ABSTRACT:
In a system for enhancing horizontal detail of a luminance signal, a horizontal peaking signal to be added to the luminance signal is cored with the depth of coring varied in accordance with a coring control potential. To develop the coring control potential, the input luminance signal is capacitively coupled to the input of a signal translator comprising an inverting amplifier with a frequency selective negative feedback path providing the translator with a low pass characteristic and a signal delay substantially equal to the delay of a delay line employed in peaking signal formation. An additional feedback path is provided by the emitter-collector path of a clamping transistor that conducts in response to sync pulse appearances to readjust the charge on the input capacitor, clamping the sync pulse peaks to a potential selected to establish a desired coring depth for black scene regions. Amplifier gain is set to provide translator output swing establishing a desired minimum coring depth (e.g., zero) for peak white scene regions.

REFERENCES:
patent: 2863943 (1958-12-01), Luther, Jr.
patent: 4167749 (1979-09-01), Burrus
The copending U.S. patent application of L. Cochran, entitled "Dynamic Coring Circuit", and concurrently filed with the subject patent application, Ser. No. 373,750.
U.S. patent application of Robert L. Shanley, II Ser. No. 363,856, filed on Mar. 31, 1982.

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