Disc driving apparatus capable of reproducing the track address

Details Disc driving apparatus capable of reproducing the track address Disc driving apparatus capable of reproducing the track address

1994-07-26

1996-06-04

Young, W. R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 48, 369 59, 369124, G11B 700

Patent

active

055239870

ABSTRACT:
A disc driving apparatus is disclosed. The disc driving apparatus is adapted for driving a disc-shaped recording medium of sampled servo system having predetermined servo patterns recorded at predetermined intervals thereon, each of the servo patterns including a clock pit formed at center of a track and at least two wobble pits, each being offset toward inner and outer peripheries of the disc-shaped recording medium. The disc driving apparatus includes: a reproducing unit for reproducing the servo patterns to output analog reproduction signals; an analog-to-digital converting unit for digitizing the analog reproduction signals in response to a channel clock signal; a phase error generating unit for generating a phase error signal by a predetermined process based upon a plurality of digital data forming digital reproduction signals; a peak detecting unit for detecting a sum signal representing a sum value of each peak level of the digital reproduction signals reproduced from the two wobble pits; a dividing unit for dividing the phase error signal by the sum signal to output divided phase error signal; and a channel clock generating unit for generating the channel clock signal phase-corrected in accordance with the divided phase error signal.

REFERENCES:
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 5249169 (1993-09-01), Ogawa
patent: 5436770 (1995-07-01), Wuto et al.
Patent Abstracts of Japan, vol. 15, No. 395, P1260, Oct. 7, 1991, & JP3-156774.
Patent Abstracts of Japan, vol. 16, No. 272, P1373, Jun. 18, 1992, & JP4-69868.

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