Dynamic magnetic information storage or retrieval – Record editing
Patent
1982-02-10
1984-09-04
McElheny, Jr., Donald E.
Dynamic magnetic information storage or retrieval
Record editing
360 103, 360 77, H04N 5783, G11B 2110
Patent
active
044700792
ABSTRACT:
A tracking control system in a magnetic recording and reproducing apparatus having one or a plurality of rotary heads for reproducing a signal by successively scanning oblique tracks on a magnetic tape, comprises a head moving mechanism for moving at least one rotary head along a direction of its height, a head moving signal applying circuit for generating a head moving signal in the form of a square wave which rises and falls for every 2nT (n is an integer, and T is a period in which one rotary head scans one track) period, when the rotary head scans the track with the same scanning pattern in units of 2nT period, to apply this head moving signal to the head moving mechanism, and a tracking control circuit for comparing a level of a reproduced signal at a position separated by a predetermined distance from an end part of the reproduced signal track by scanning the track in a state where the rotary head is moved to one side by the head moving mechanism, and a level of a reproduced signal at a position separated by the predetermined distance from an end part of the reproduced signal track by scanning the track in a state where the rotary head is moved to the other side by the head moving mechanism, to detect the tracking error, and obtaining a control signal from a detected output to apply the control signal to the head moving mechanism.
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patent: 4143405 (1979-03-01), Kubota
patent: 4148083 (1979-04-01), Watanabe
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patent: 4197564 (1980-04-01), Ravizza
patent: 4285017 (1981-08-01), Arter et al.
patent: 4327384 (1982-04-01), Tomita et al.
patent: 4402022 (1983-08-01), Hirota et al.
McElheny Jr. Donald E.
Victor Company of Japan Ltd.
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