Noise reduction in television signals

Details Noise reduction in television signals Noise reduction in television signals

1976-04-26

1977-11-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 521

Patent

active

040588360

ABSTRACT:
Reduction of noise in a television signal is achieved by comparing signals from successive frame or field scans and noting the differences. Low amplitude differences are assumed to represent noise and are attenuated. Differences above a predetermined level are assumed to represent movement and are not so attenuated by a factor K. Where there are inherent differences between the signals compared, for example they are different fields of an interlaced scan or are color signals with different subcarrier phases, the signal from the earlier scan is modified to compensate for these differences and provide a signal for comparison which is a better estimate of the expected signal on the later scan.

REFERENCES:
patent: 3920889 (1975-11-01), Connor

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