Apparatus for reducing noise in high-frequency band

Details Apparatus for reducing noise in high-frequency band Apparatus for reducing noise in high-frequency band

1990-01-18

1995-06-27

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358330, 358328, 348607, 369 59, H04N 576

Patent

active

054284554

ABSTRACT:
An apparatus for reducing noise in the high-frequency band is provided in the preceding stage of a limiter (8) with a high-frequency band correcting filter (12) for reducing a high-frequency band component of a reproduced RF signal from an optical disc. The reproduced RF signal has its high-frequency component lowered before entered into the limiter (18), reducing noise and beat components. As a result, a signal which is less influenced by the noise and beat and has good S/N can be obtained.

REFERENCES:
patent: 4042883 (1977-08-01), Rae
patent: 4119812 (1978-10-01), Fox
patent: 4256975 (1981-03-01), Fukushima et al.
patent: 4363138 (1982-12-01), Franklin et al.
patent: 4366564 (1982-12-01), de Haan et al.
patent: 4577238 (1886-03-01), Watanabe
Patent Abstracts of Japan, vol. 6, No. 186, JP-A-57 93 787.
"Laser Disc Technical Book", Kabushiki Kaisha ASCII, Nov. 1, 1986, pp. 55-60.

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