Access speed detecting means for disc player

Details Access speed detecting means for disc player Access speed detecting means for disc player

1989-12-05

1991-11-05

Richardson, Robert L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

G11B 700

Patent

active

050635450

ABSTRACT:
Apparatus for detecting the speed with which a light beam emitted by an optical head accesses a target record track on an optical disc in which record track traverse data indicating track number are recorded previously. The traverse data is read and traverse data signals indicative of the scanning position of the light beam are produced. Deviations in the traverse data signals obtained at predetermined time intervals are detected to form upper order data bits representing access speed. At the same time, tracking error data signals proportionate to the deviation of the light beam from a record track on the disc are produced and a deviation in the tracking error data signals is detected to form the lower data bits of the access speed.

REFERENCES:
patent: 4627038 (1986-12-01), Abed et al.
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4884259 (1989-11-01), Horikawa et al.

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