Video signal processor having an adjustable noise cancelling cir

Details Video signal processor having an adjustable noise cancelling cir Video signal processor having an adjustable noise cancelling cir

1992-08-26

1993-11-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5213, H04N 964

Patent

active

052628639

ABSTRACT:
An input video signal is supplied to an input terminal 10, and is input to one input terminal of a subtracter 11 and to a high-pass filter. The level of a high-frequency component from a high-pass filter 12 is adjusted by a first variable gain amplifier 13 whose gain can be externally adjusted, and the level-adjusted component is then input to a limiter 15. The limiter 15 extracts a component having a limiter level or less as a noise component. The level of the noise component extracted by the limiter 15 is adjusted by a variable gain amplifier 16 whose gain can be externally adjusted, and the level-adjusted noise component is then supplied to the other input terminal of the subtracter 11. Gain control of the first variable gain amplifier 13 is equivalent to matching the limiter level of the limiter to the level of the input noise component. Gain control of the second variable gain amplifier 16 is equivalent to matching the level of a noise canceling component, supplied to the other input terminal of the subtracter 11, to the noise component to be canceled.

REFERENCES:
patent: 4698696 (1987-10-01), Matsu
patent: 4750037 (1988-06-01), Kido et al.
patent: 4779133 (1988-10-01), Sugimori et al.
patent: 4864404 (1989-09-01), Matsu
patent: 4916542 (1990-04-01), Yoneda et al.

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