Automatic gain control circuitry

Details Automatic gain control circuitry Automatic gain control circuitry

2008-04-22

2008-04-22

Natnael, Paulos M. (Department: 2622)

Television

Image signal processing circuitry specific to television

Gray scale transformation

Reexamination Certificate

active

11014817

ABSTRACT:
To provide an automatic gain control circuitry which effectively works for a video signal of which pedestal level in an effective video period is different from the pedestal level in the vertical blanking period. The automatic gain control circuitry comprises a first pedestal level detection part to detect a synchronizing level in the vertical blanking period of the video signal, a second pedestal level detection part to detect a synchronizing level in an effective video period of the video signal, and a ratio determination part to determine a ratio between the value detected by the first pedestal level detection part and the value detected by the second pedestal level detection part and multiplying the ratio to a standard value of the synchronizing value in the vertical blanking period for outputting the obtained value as the reference synchronizing level.

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Matsunaga, Japanese Office Action, Reference No. SA003858, Feb. 7, 2006, Japan.

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