Scan velocity modulation circuit

Details Scan velocity modulation circuit Scan velocity modulation circuit

1994-06-20

1997-02-04

Peng, John K.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348625, H04N 332

Patent

active

056003811

ABSTRACT:
A television receiver includes a scan velocity modulation circuit. An amplitude correction circuit couples vertical and horizontal parabola signals to the scan velocity modulation circuit so as to vary scan velocity modulation with displacement of beam position from the center of the screen. The parabola signals may be derived from a pincushion correction circuit of the television receiver, for example, from a diode modulator. The position-indicating parabolas may control amplifier gain within the scan velocity modulation circuit, output level limiting, or the amplitude of the differentiated luminance signal applied to the amplifier to provide scan velocity modulation reduction away from screen center.

REFERENCES:
patent: 3946152 (1976-03-01), Illetschko et al.
patent: 4185301 (1980-01-01), Mitsuda et al.
patent: 5093728 (1992-03-01), Altmanshofer
patent: 5164829 (1992-11-01), Wada
patent: 5179320 (1993-01-01), Tripod
patent: 5351094 (1994-09-01), Washino
patent: 5402044 (1995-03-01), Haferl
patent: 5444500 (1995-08-01), Ten Pierick et al.
patent: 5486870 (1996-01-01), Decreamer
"Scan Velocity Modulation --Making It Crisp Around The Edges!", Best of the Expander, vol. II, pp. 74-79, dated 1988.

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