Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1975-05-30
1976-07-06
Konick, Bernard
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 68, G11B 1502, G11B 502
Patent
active
039685195
ABSTRACT:
An amplifier, for example, of a tape recording and reproducing apparatus, has a first smoothing power circuit for supplying DC power to operate the amplifying circuit when connected to an AC power source, and a second smoothing power circuit also adapted for connection to the AC power source for supplying DC power to operate other elements of the apparatus, such as, an oscillator for the bias signal to be applied to the recording head and/or an alarm for indicating the exhaustion of the tape, and also to energize a relay coil or the like by which change-over switches are actuated to their position for the recording mode of operation of the apparatus, with the first and second smoothing power circuits respectively having relatively large and small discharging time constants when disconnected from the AC power source so that, if the smoothing power circuits are disconnected from the AC power source while the apparatus is in its recording mode, the change-over switches may be returned to their positions for the reproducing or playback mode of the apparatus while the amplifying circuit is still operative to produce howling. Such howling is prevented by providing an amplifier, as aforesaid, with a holding circuit which detects the disconnection of the smoothing power circuits from the AC power source and, in response thereto, is effective to hold the change-over switches in their recording mode positions until the DC voltage applied to the amplifying circuit has declined sufficiently to render the latter inoperative.
REFERENCES:
patent: 3330915 (1967-07-01), Roberts
patent: 3347996 (1967-10-01), Uchikoshi
patent: 3798385 (1974-03-01), Saito
patent: 3801963 (1974-04-01), Chen
patent: 3889289 (1975-06-01), Kubach
Inagaki Isamu
Yoneya Juho
Eslinger Lewis H.
Konick Bernard
Lucas Jay P.
Sinderbrand Alvin
Sony Corporation
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