Dynamic magnetic information storage or retrieval – Record editing
Patent
1982-04-13
1984-12-18
McElheny, Jr., Donald E.
Dynamic magnetic information storage or retrieval
Record editing
310332, H04N 5783
Patent
active
044893523
ABSTRACT:
A video signal recording/reproducing apparatus includes a first set of rotary heads mounted on a rotary disk and a second set of rotary heads mounted on head actuators which are also mounted on the rotary disk. The apparatus has two reproduction modes. A magnetic tape in the first reproduction mode is driven at a speed equal to the speed used in a recording mode. The magnetic tape in the second reproduction mode is driven at a speed which is different from the speed used in the recording mode. The apparatus has a negative feedback loop which detects the reproduced signal level of the second set of rotary heads and drives the head actuators in order to increase the reproduced signal level of the second set of rotary heads. In the first reproduction mode, the negative feedback loop is intermittently closed. At the period of time when the negative feedback loop is open, the negative feedback loop holds the value of its output signal to that of the last time period when the negative feedback loop was closed, and, in addition, the head actuator is not driven when the feedback loop is open. At a transitional period when the apparatus switches from the first reproduction mode to the second reproduction mode, a holding signal from the negative feedback loop is supplied to the head actuator.
REFERENCES:
patent: 4197564 (1980-04-01), Ravizza
Honjo Masahiro
Kobayashi Masa-aki
Matsumoto Masayuki
Tomita Masao
Yamanishi Kazuhiro
Matsushita Electric - Industrial Co., Ltd.
McElheny Jr. Donald E.
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