Dynamic magnetic information storage or retrieval – Record copying
Patent
1991-10-29
1993-09-28
Shepperd, John
Dynamic magnetic information storage or retrieval
Record copying
G11B 586
Patent
active
052490840
ABSTRACT:
A method and apparatus is used for dubbing a recorded video tape simultaneously with the playing back of the recorded video tape from the initiation of the playback. The apparatus includes a synchronous record switch means for generating a synchronous record signal to enable the video tape recorder to dub the video tape in synchronism with the playing back, control means for generating first and second control signals, the first control signal driving a deck in record mode to load an empty video tape and thereafter to pause the video tape recorder when a record signal is inputted together with the synchronous record signal, the second control signal driving the deck in playback mode to load a recorded video tape and thereafter causing the video tape recorder to be in pause mode when a playback signal is inputted together with the synchronous record signal, pilot signal generating means for generating a pilot signal of a pilot signal frequency in response to the first or second control signals, a signal mixer for mixing the pilot signal and an audio signal generated from the recorded video tape being played back, pilot signal detection means for detecting the pilot signal from the mixed signal, an integrating circuit for integrating the pilot signal, and a comparator for comparing the integrated signal of the integrating circuit with a reference signal to detect the pilot signal to release the video tape recorder from the pause mode.
REFERENCES:
patent: 5057934 (1991-10-01), Yun et al.
patent: 5097461 (1992-03-01), Majima
Bushnell Robert E.
Kim Chris
Samsung Electronics Co,. Ltd.
Shepperd John
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