Optical information reproducing apparatus using transversal filt

Details Optical information reproducing apparatus using transversal filt Optical information reproducing apparatus using transversal filt

1996-09-13

1997-09-09

Hindi, Nabil

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369124, G11B 700

Patent

active

056663390

ABSTRACT:
An optical information reproducing apparatus according to the present invention optically reproduces information from a recording medium on which the information is recorded as a mark string, and comprises irradiation section for irradiating a light beam onto the recording medium through an object lens, and signal processing section for detecting diffraction light from the recording medium as a reproducing signal and processing the obtained reproducing signal to reproduce the information recorded on the recording medium. With this configuration, the signal processing section includes a transversal filter having delay section with a plurality of taps for receiving the reproducing signal, and section for performing weighted addition of output signals from the respective taps of the delay section with predetermined tap coefficients, the transversal filter having a delay time g between the respective adjacent taps, the delay time g being given by one of .tau.=(0.37 to 0.51).times..lambda. / (v.times.NA) and .tau.=Lmin/v where .lambda. is a wavelength of the light beam, NA is a numerical aperture of the object lens, Lmin is a minimum mark length of the mark string, and v is a speed of the recording medium relative to the light beam.

REFERENCES:
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patent: 5166914 (1992-11-01), Shimada et al.
patent: 5181161 (1993-01-01), Hirose et al.
patent: 5442615 (1995-08-01), Ohsato et al.
Optical disk Technique; Ogami, Murayan, Koide, Yamada, Kunikane, Feb. 10, 1989.
Nikkei Electronics; Moriyama, Yamamoto, Shimizu, Mar. 28, 1994.

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