Clamp circuit for clamping a video signal and a circuit for superimposing composite video signals
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
May 28, 1997
filing date -
Dec 25, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a clamp circuit for clamping a video signal which includes a sync tip clamp circuit, a pedestal clamp circuit, and a direct current electrical potential correcting circuit. The sync tip clamp circuit clamps a sync tip of the horizontal synchronization signal of the composite video signal at a first reference electrical potential when a clamp pulse is not received in a pulse input terminal, and outputs the composite video signal to an output terminal. The pedestal clamp circuit clamps the pedestal DC electrical potential of the composite video signal received to the video signal input terminal to the second reference electric potential when the clamp pulse is received at the pulse input terminal, and outputs the composite video signal to the output terminal. The direct current electrical potential correcting circuit adjusts DC power levels of the composite video signals in response to the output signal of the first reference electrical potential from the sync tip clamp circuit and the output signal of the second reference electrical potential from the pedestal clamp circuit. According to the present invention, the composite video signal is not largely changed even if the clamp pulses drop out.
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