Adaptive field or frame store processor

Details Adaptive field or frame store processor Adaptive field or frame store processor

1985-02-04

1987-05-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, 358158, H04N 504, H04N 514

Patent

active

046654372

ABSTRACT:
Apparatus and a method for controlling the field or frame store signal processing of standard and nonstandard video signals is disclosed. The apparatus includes a nonstandard signal detector which compares the received horizontal sync signals to a horizontal sync signal generated internally be counting down a clock signal having a frequency proportional to the color subcarrier frequency. The detector produces a control signal which is in one state when the horizontal sync signals are substantially in coincidence and in a second state otherwise. This control signal is applied to apparatus which switches from field or frame store signal processing apparatus to alternative signal processing apparatus, which does not include a field or frame memory, to minimize distortion of the image when nonstandard signals are processed.

REFERENCES:
patent: 4240105 (1980-12-01), Faroudja
patent: 4335403 (1982-06-01), Srivastava
patent: 4400719 (1983-08-01), Powers
patent: 4415931 (1983-11-01), Dischert
patent: 4426661 (1984-01-01), Okada et al.
patent: 4454531 (1984-01-01), Elmis et al.
patent: 4593315 (1986-06-01), Willis et al.

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