Dynamic magnetic information storage or retrieval – Record editing
Patent
1984-03-09
1987-01-13
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Record editing
360 103, 360 77, H04N 5782, G11B 2110
Patent
active
046368744
ABSTRACT:
A system (1) for reproducing information signals recorded on a magnetic tape (2) in oblique tracks (S) in different modes of operation with different tape speeds v(n) includes a tape drive device (13), which is switchable in respect of the tape speed, at least one magnetic head (K1, K2), which is rotatable by a head drive device (32), which is switchable as regards the speed of rotation, and a tracking servo system (41) for guiding said head along the tracks, and including a sawtooth generator (67) whose signal waveform is variable in order to generate a sawtooth-shaped control signal. In the case of a change of mode, the tape drive device (13), the sawtooth generator (67) and the head drive device (32) are set to different operating values by a switching device (12). The switching device (12) includes a stepping signal generator (91) for generating control signals (TW(n), DS(n), TV(n)) which are supplied incrementally in a plurality of steps and which change in value upon every step during a change of mode, by which control signals, the tape drive device (13), the sawtooth generator (67) and the head drive device (32) can be switched over stepwise in stages defined by the values of the control signals in order to ensure an undisturbed reproduction of the information signals in the case of a change of mode.
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Hoogendoorn Abraham
Kuchar Franz
Briody Thomas A.
Cardillo Raymond F.
Oisher Jack
Streeter William J.
U.S. Philips Corporation
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