Back-porch clamp

Details Back-porch clamp Back-porch clamp

2006-10-24

2006-10-24

Yenke, Brian P. (Department: 2622)

Television

Image signal processing circuitry specific to television

Dc insertion

C348S689000, C348S691000, C348S696000, C348S697000, C348S698000

Reexamination Certificate

active

07126645

ABSTRACT:
The invention teaches a method, means and apparatus for clamping a back porch interval of a video signal including clamping a sync-tip level of said video signal to a variable reference voltage, comparing a back-porch voltage level of the sync-tip clamped video signal to a predetermined reference voltage, generating an error signal representative of the difference between the back-porch voltage level and the predetermined reference voltage, and adjusting the variable reference voltage in response to the error signal such that the error signal is minimized.

REFERENCES:
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patent: 5841488 (1998-11-01), Rumreich
patent: 6028642 (2000-02-01), Rinaldi et al.
patent: 6154256 (2000-11-01), Bruins
patent: 6195133 (2001-02-01), Bae
patent: 6529248 (2003-03-01), Tsyrganovich
patent: 6580465 (2003-06-01), Sato
patent: 6587139 (2003-07-01), Hirao
patent: 6967691 (2005-11-01), Keen
patent: 4215668 (1993-11-01), None
patent: 0944246 (1999-09-01), None
Copy of Search Report dated May 31, 2002.

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