Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1977-03-15
1979-10-16
Cook, Daryl W.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 14, 360 75, G11B 2104, G11B 2102
Patent
active
041715306
ABSTRACT:
The invention relates to a system for electronic editing of video signals recorded by the diagonal track method on magnetic tape, comprising a rotatable head-wheel including video recording heads and video erasing heads, a head-wheel motor in driving relation with the head-wheel and controlled by a first control signal, moving means operable for moving said magnetic tape between two reels comprising a capstan, and a capstan motor in driving relation with the capstan and controlled by a second control signal, first monitoring means operable for generating a first tachometer signal proportional to the speed of the head-wheel motor, second monitoring means operable for generating a second tachometer signal proportional to the speed of the capstan motor, a source of a reference signal, a comparator coupled to the first tachometer signal and the reference signal and operable for generating the first control signal, generating means coupled to the reference signal and operable for generating a third control signal which is to be recorded on a control track portion of the magnetic tape during the recording of the video signals and which, during the playback of the video signals, is compared to the second tachometer signal to generate the control signal, a control device controlled by a third control signal and alternatively activating the video erasing heads and the video recording heads, and synchronizing means coupled to the first and second control signals and to the control device and comprising a shift register, and being operable for generating the third control signal.
REFERENCES:
patent: 3651276 (1972-03-01), Clark
patent: 3654398 (1972-04-01), Louth
patent: 3663764 (1972-05-01), Trost et al.
patent: 3787615 (1974-01-01), Foerster et al.
patent: 3898694 (1975-08-01), Muller
patent: 4001886 (1977-01-01), Bruinink
Cook Daryl W.
Marmorek Ernest F.
Robert & Bosch GmbH
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