Noise reduction circuit for video tape recording and playback ap

Details Noise reduction circuit for video tape recording and playback ap Noise reduction circuit for video tape recording and playback ap

1986-03-11

1987-10-06

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358167, H04N 576, H04N 521

Patent

active

046986960

ABSTRACT:
Disclosed is a noise reduction circuit for reducing noise contained in a luminance signal, wherein a first subtractor has a first input terminal connected to be responsive to the luminance signal. A low-pass filter passes a low-frequency component of the output of the first subtractor to a second subtractor which combines it with the luminance signal to extract high-frequency noise contained therein. The extracted noise is limited in amplitude by a limiter and applied through a feedback circuit to the second input terminal of the first subtractor. The noise reduction circuit operates as if it were a low-pass filter having a cutoff frequency which increases as a function of the level of the luminance signal to reduce the length of time in which smear and noise tend to occur in response to high amplitude luminance signals.

REFERENCES:
patent: 4249209 (1981-02-01), Storey
patent: 4249210 (1981-02-01), Storey et al.
patent: 4291330 (1981-09-01), Hirai
patent: 4322746 (1982-03-01), Oguino
patent: 4563704 (1986-01-01), Hirota

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