Apparatus for tracking magnetic head on rotary magnetic recording medium by envelope detection
AssigneeFuji Photo Film Co., Ltd.
InventorIzumi Miyake
Life of this patent
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Abstract
A tracking apparatus applicable to a rotatable magnetic recording medium which is provided with a plurality of discrete tracks thereon includes a head for sensing signals out of the tracks, a head transport mechanism for moving the head to a position on a desired one of the tracks, an envelope detector for detecting an envelope of signals sensed by the head, and a controller for performing tracking by controlling the head transport mechanism responsive to the detected envelope. A sync signal generator circuit is provided for producing a reference signal which is synchronous to the rotation of the recording medium. The controller controls the head transport mechanism and causes the envelope detector to detect an envelope, responsive to the reference signal.
Claims5
A tracking apparatus for a rotary magnetic recording medium on which a plurality of tracks are recorded, each track defining an endless loop, comprising:
- magnetic head means for sensing signals recorded on one of the plurality of tracks;
- head transport means for transporting said magnetic head means across the rotary magnetic recording medium;
- detector means for detecting an envelope of the signals sensed by said magnetic head means;
- control means for controlling said head transport means to cause said magnetic head means to be transported onto desired ones of the plurality of tracks on the basis of the detected envelope;
- and
- sync signal producing means for producing a reference signal which is synchronous with rotation of the recording medium;
- said control means being responsive to the reference signal to receive the detected envelope and effect tracking of said magnetic head means by said head transport means.
Dependencies are inferred from the claim text.