Dynamic magnetic information storage or retrieval – Record editing
Patent
1975-02-05
1976-02-17
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Record editing
360 70, 360 73, H04N 5795
Patent
active
039394905
ABSTRACT:
An apparatus is provided for recording on videotape to insure the absence phase error between different sequences in the assembling mode. The apparatus includes a reference pulse source and circuitry to apply reference pulses from the source to a first recording of the tape through a fixed transducer head for recording and playback. The reference pulses also control the speed of the motor driving the tape through a servo mechanism. A tachometer-generator is operatively connected to the motor to produce a train of pulses related to the motor speed at a frequency comprising a fixed integer multiple of the frequency of the reference pulses. The output of the tachometer is fed to a counter which divides the tachometer pulses by the fixed integer so that the output of the counter represents a train of pulses, the frequency of which is equal to that of the reference pulses. The present apparatus further includes a first circuit interconnecting the transducer head and the counter when the recorded reference pulses of the first recording are played back so as to bring the output of the counter into phase synchronization with the recorded reference pulses. The apparatus also includes a second circuit interconnecting the output of the counter and the transducer head and disconnecting the reference pulse source from the transducer head when assembling of an additional sequence so as to produce reference pulses for the additional sequence from the counter and hence in phase synchronization with the reference pulses on the first sequence.
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patent: 3654398 (1972-04-01), Louth
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patent: 3686432 (1972-08-01), Deguchi et al.
patent: 3742132 (1973-06-01), Sanguu et al.
patent: 3772468 (1973-11-01), Tatsuguchi
Cardillo, Jr. Raymond F.
Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Inh. Max Grun
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