Dynamic magnetic information storage or retrieval – Record editing
Patent
1975-02-21
1976-08-31
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Record editing
360 70, 360 73, 318314, G11B 2732
Patent
active
039785211
ABSTRACT:
The invention relates to a recording and playback apparatus for video signals including a drive shaft for driving a record carrier, whose revolution speed can be controlled by a servo system, and a switching device to ensure that a new recording without interruption follows an existing recording, said apparatus comprising a measuring and storage device for measuring and storing the difference in phase between the pulses supplied by the tacho-generator and the pulses scanned from the synchronizaton track which device is followed by a comparator, for comparing the stored measuring value with the reference signal for the servo system, which comparator if its input signals are equal supplies its output signal to the servo system as the measuring signal. Such a servo system prevents the occurrence of undesired phase shifts at the transition from the existing recording to the new recording. The stored value, representing the phase difference between the tach signal and the recorded vertical sync signal, controls the delay of the tach signals when a new video insert is added.
REFERENCES:
patent: 3520993 (1970-07-01), Jacoby
patent: 3542949 (1970-11-01), Tanaka
patent: 3580994 (1971-05-01), Kosaka
patent: 3636252 (1972-01-01), Kowal
patent: 3643012 (1972-02-01), Clark
patent: 3662098 (1972-05-01), Yano
patent: 3742132 (1973-06-01), Sanguu
Jahnke Uwe
Langer Erich
Sommer Friedrich
Cohen Simon L.
Eddleman Alfred H.
Faber Alan
Trifari Frank R.
U.S. Philips Corporation
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