Noise reduction circuit for video signal recording/reproduction

Details Noise reduction circuit for video signal recording/reproduction Noise reduction circuit for video signal recording/reproduction

1991-01-25

1992-04-14

Goody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358340, H04N 5213

Patent

active

051052750

ABSTRACT:
A reproduction system noise reduction circuit of a VTR is implemented in combination with a recursive type noise reduction circuit and a non-recursive type noise reduction circuit. The recursive type noise reduction circuit has a characteristic complimentary to that of a recording system vertical emphasis circuit to function as a vertical de-emphasis circuit subjecting a reproduced luminance signal to vertical de-emphasis. The non-recursive type noise reduction circuit cancels noise components without line correlation from the reproduced luminance signal subjected to vertical de-emphasis. It is not necessary to increase noise reduction amount in each noise reduction circuit because vertical de-emphasis and noise reduction are carried out individually. Therefore, degradation of vertical resolution and increase in raining-like noise are prevented.

REFERENCES:
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patent: 4635120 (1987-01-01), Ichinoi
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patent: 4860105 (1989-08-01), Sakaguchi et al.
patent: 4885639 (1989-12-01), Nakata et al.
patent: 4962434 (1990-10-01), Matsuo

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