Dynamic magnetic information storage or retrieval – Record editing
Patent
1979-04-13
1982-11-09
Konick, Bernard
Dynamic magnetic information storage or retrieval
Record editing
360 111, 360 371, 360 381, H04N 578, H04N 712
Patent
active
RE0310786
ABSTRACT:
A helical scan video tape recorder suitable for slow and fast motion modes of operation is disclosed. A plurality of video fields are recorded in each video track extending across the video tape such that the burst of noise produced when the magnetic head crosses over the guard band between separate video tracks during the slow or fast mode of operation of the video recorder is encountered in only one of the field regions in the video track. This burst of noise is utilized to control the television monitor circuit so that the video field region which is free of noise is reproduced on the monitor while the video field region which contains the noise is blanked out from the monitor. As the noise progresses from one field region to the succeeding field region in the video track, means is provided for automatically switching to display of the noise-free field region. Means is provided for at times controlling the brightness of the monitor to compensate for those instances at switchover where two fields are reproduced in succession without the intervening blank period. A ramp generator circuit is provided for compensating for the change in timing of the vertical sync pulses during the slow and fast motion periods. In another embodiment, an additional magnetic head is utilized for reproducing the noise-free video field during the time period that the monitor would ordinarily be blanked out to thereby provide a 100 percent duty cycle in the video monitor.
REFERENCES:
patent: 3157739 (1964-11-01), Okamura
patent: 3170031 (1965-02-01), Okamura
patent: 3197559 (1965-07-01), Kihara
patent: 3202769 (1965-08-01), Coleman
patent: 3290438 (1966-12-01), Okamura
patent: 3356921 (1967-12-01), Bradford
patent: 3469029 (1969-09-01), Bell
patent: 3573357 (1968-04-01), Lace
Faber Alan
Konick Bernard
Video Logic Corporation
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