Clamping circuits for television signals

Details Clamping circuits for television signals Clamping circuits for television signals

1977-06-30

1978-09-12

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358172, 307237, 330 11, 328172, H04N 9535, H04N 518, H03G 1100

Patent

active

041141792

ABSTRACT:
A clamping circuit in which a signal such as a line sequential color television signal is clamped to a reference, such as a black level by means of a corrective signal which is the integrated output of a current multiplier. The gain of the multiplier, which is fed with a signal corresponding to the difference between the signal that is to be clamped and the reference, varies from a maximum to a minimum during a period of clamping. Large initial error in the signal can be rapidly corrected and the final corrective signal corresponds to the average error during the period of clamping.

REFERENCES:
patent: 2843666 (1958-07-01), Preisig

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