Cross-talk canceler for optical disk reading mechanism

Details Cross-talk canceler for optical disk reading mechanism Cross-talk canceler for optical disk reading mechanism

1994-05-18

1996-08-06

Epps, Georgia Y.

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

369 44290, 369 44320, 369 44340, 369 44360, G11B 700

Patent

active

055441416

ABSTRACT:
Reproduced signals from detectors 1a to 1c installed in an optical head are level-adjusted by amplifiers 2a to 2c. Output signals of the amplifiers 2a and 2b are delayed by respective delay circuits 6a and 6b. An output signal of the delay circuit 6b and an output signal of the amplifier 2c are subtracted from an output signal of the delay circuit 6a by an adder 4. A reproduced signal from which cross-talk resulting from the adjacent track has been removed is obtained from the adder 4. The delay amounts of the delay circuits 2a and 2b are set according to delay control signals 8a and 8b. The delay amounts are set when accessing to a fixed pattern recording area disposed on a predetermined position of the optical disk. A control circuit 5 measures a time difference between the output signal of the detector 1b and the output signal of the detector 1c to output a delay control signal 8a. The control circuit 5 measures a time difference between the output signal of the detector 1a and the output signal of the detector 1c to generate a delay control signal 8a.

REFERENCES:
patent: 4750162 (1988-06-01), Tajima
patent: 5168487 (1992-12-01), Ohsato et al.
patent: 5212675 (1993-05-01), Yoshino et al.
Patent Abstracts of Japan vol. 13, No. 250, (P-882), abstract of Shigeru, "Optical Disk Recording And Reproducing Device", Japanese 1-049134, Aug. 19, 1987.
Patent Abstracts of Japan vol. 13, No. 162, (P-859), Apr. 19, 1989, abstract of Tadao et al., "Crosstalk Eliminating Circuit in Optical Reproducing Device", Japanese 64-001122, Jan. 5, 1989.
Katayama et al., "Multi-Beam Optical Disk Drive For High Data Transfer Rate Systems", Japanese Journal of Applied Physics, vol. 31:630-634, (1992).

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