SOG signal detection circuit

Details SOG signal detection circuit SOG signal detection circuit

2007-08-27

2011-10-25

Koenig, Andrew (Department: 2423)

Television

Image signal processing circuitry specific to television

Brightness control

C348S534000, C348S695000, C348S697000

Reexamination Certificate

active

08045065

ABSTRACT:
A Sync On Green signal detection circuit includes a clamping circuit for clamping a voltage of a video graphics signal within a default range and then outputting a clamped input signal; a first PGA (programmable gain amplifier) for receiving and amplifying the clamped input signal by a first gain to generate a first gain signal; a first low-pass filter for receiving the first gain signal and then generating a first filtered signal; a second PGA for receiving and amplifying the clamped input signal by a second gain to generate a second gain signal, wherein the second gain is different from the first gain; a second low-pass filter for receiving the second gain signal and then generating a second filtered signal; a programmable voltage shifter for receiving and adjusting the first filtered signal and then outputting a level shifted signal; and a comparator for receiving the level shifted signal and the second filtered signal and then generating a comparison signal as a SOG signal.

REFERENCES:
patent: 5379075 (1995-01-01), Nagasawa et al.
patent: 5867222 (1999-02-01), Norris et al.
patent: 2004/0090558 (2004-05-01), Takahashi et al.
patent: 2005/0270421 (2005-12-01), Lu

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