System for recovering information from a movable information sto

Details System for recovering information from a movable information sto System for recovering information from a movable information sto

1978-06-30

1980-11-25

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Head

Core

1791001S, 1791003V, 1791004E, 360 73, G11B 1928, G11B 1702, G11B 2730

Patent

active

042360501

ABSTRACT:
Method and apparatus for controlling the speed of an information storage medium, such as a disc-shaped record carrier, relative to a device for recovering information recorded thereon. The disc includes a plurality of substantially parallel information tracks arranged in a spiral or in concentric circles, and information recorded thereon includes a pilot signal having a predetermined frequency. The apparatus includes means for comparing the phase angle of the recovered pilot signal with the phase angle of a locally generated reference signal, to produce an error signal for controlling the angular velocity of a spindle motor that rotates the disc. The pilot signal includes an equal integral number of cycles on each information track, so its phase angle is aligned on adjacent tracks and the apparatus can continue to operate even when the information recovering device is traversing the disc from one track to another or is not critically positioned with respect to an individual information track.

REFERENCES:
patent: 3509274 (1970-04-01), Kihara
patent: 3586789 (1971-06-01), Butcher
patent: 3646259 (1972-02-01), Schuller
patent: 3662354 (1972-05-01), Chertok
patent: 3705262 (1972-12-01), Kennedy et al.
patent: 3829892 (1974-08-01), Nagahiro et al.
patent: 3873765 (1975-03-01), Schoop et al.
patent: 4005259 (1977-01-01), Kaneko
patent: 4123779 (1978-10-01), Goldschmidt

Affiliated with

Also associated with

Rating

System for recovering information from a movable information sto does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for recovering information from a movable information sto, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for recovering information from a movable information sto will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1131042