Method of generating a video aperture correction signal

Details Method of generating a video aperture correction signal Method of generating a video aperture correction signal

1982-01-18

1983-10-18

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514

Patent

active

044109121

ABSTRACT:
To obtain an aperture correction signal with improved signal-to-noise ratio and having steep flanks with low harmonic content, the video signal is twice differentiated to obtain the second differential (C), and is also once differentiated to obtain the first differential (B), which is squared, the squared first differential and the second differential being multiplied and the product, after phase-matching by inversion, is applied as a correction signal (F), additively, in an adder (11) to the video signal (A) to form an aperture corrected output signal (G). Prior to the addition step, the video signal is time delayed to compensate for delays in the signal processing stages (4, 6, 7, 8) of the system (2).

REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
SMP Jun. 1960, pp. 395-401 "A Vertical Aperture Equalizer for Television" by Gibson & Schroeder.

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