Disc reproducing method and apparatus with multiple heads

Details Disc reproducing method and apparatus with multiple heads Disc reproducing method and apparatus with multiple heads

1993-12-10

1996-01-30

Hindi, Nabil Z.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 50, 369 4426, 369 58, G11B 700

Patent

active

054885930

ABSTRACT:
A disc reproducing apparatus for reproducing data stored on plural disc surfaces at a constant linear density comprises: plural heads for reproducing the data on the plural disc surfaces at the same time respectively; a controller for controlling positions of the heads such that a total data rate of data reproduced form the plural heads is constant, each of the disc surfaces being divided into N circumference zones; N signal processing circuits, having N processing speeds corresponding to N data rates corresponding to the N circumference zones, for processing the reproduced data respectively; a switch for supplying the reproduced data to the N signal processing circuits such that data reproduced by each of the plural heads is supplied to any of the N signal processing circuits suitable for the data rate of the supplied data thereto; and a combining circuit for combining the processed data signals from the N signal processing circuits into a combined serial data signal of which data rate corresponds to the total of data rates. A disc reproducing method of reproducing data stored on a plurality of disc surfaces at a constant linear density using N signal processing circuits and the switch is also disclosed.

REFERENCES:
patent: 4613964 (1986-09-01), Ichikawa et al.
patent: 5086419 (1992-02-01), Yanagi
patent: 5111345 (1992-05-01), Muller
patent: 5148416 (1992-09-01), Itoshino et al.
patent: 5161137 (1992-11-01), Suzuki
patent: 5253242 (1993-10-01), Satoh et al.
patent: 5347506 (1994-09-01), Matsudo et al.
patent: 5363364 (1994-11-01), Torazawa et al.

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