Equipment for playing back data

Details Equipment for playing back data Equipment for playing back data

1988-09-28

1992-07-28

Levy, Stuart S.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4427, 369 4428, G11B 1722, G11B 700, G11B 2110

Patent

active

051345994

ABSTRACT:
A method for skipping tracks in apparatus playing back data that is readable from data-storage tracks on a recording medium by an optical scanner when a base of light is positioned on the tracks by a tracking circuit. The optical scanner is shifted from one data track to another by a skipping pulse during a track-skipping procedure, and is halted in place there by a braking pulse. The tracking circuit is opened not prior to the beginning of the skipping pulse and not later than the departure from the data-storage track. The optical scanner is braked by a first braking pulse of constant length and amplitude, but which is too small. A second braking pulse is produced with pulse characteristics dependent on the time that elapses until a predetermined point on the next data-storage is arrived at. The second braking pulse thereby halts the scanner in the middle of the next data-storage track. The tracking circuit is then closed, but not prior to the beginning of the second braking pulse and not later than the middle of the next data-storage track.

REFERENCES:
patent: 4333117 (1982-06-01), Johnson
patent: 4598394 (1986-07-01), Nonaka
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4740939 (1988-04-01), Kimura et al.
patent: 4817073 (1989-03-01), Suzuki
patent: 4899325 (1990-02-01), Katsuhara
patent: 4930114 (1990-05-01), Tateishi
patent: 4937689 (1990-06-01), Seaver et al.

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