Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1991-10-28
1993-04-13
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
G11B 509
Patent
active
052028003
ABSTRACT:
A device switches a coil (2) between a first state (REC) where it is connected between a supply source (V.sub.REC) and ground through a variable current source (I.sub.REC), and a second state (PB) where it is connected between ground and the input of an amplifier (3) through a coupling capacitor (CC). The device comprises a first controlled switch (T.sub.PB) connected in parallel to the current source (I.sub.REC); a second controlled switch (T.sub.REC) placed between the supply source (V.sub.REC) and the coil (2); a threshold comparator (4, V.sub.T), the inputs of which are connected across the capacitor (CC); a logic control circuit (5) receiving a state control signal (REC/PB) and the output signal (V.sub.C) of the threshold comparator (4, V.sub.T) and, as a function of these signals, alternatively controlling switches (T.sub.PB, T.sub.REC) with no overlapping of their closed states.
REFERENCES:
patent: 3959817 (1976-05-01), Honjo et al.
patent: 4518925 (1985-05-01), Fukasawa
patent: 4665446 (1987-05-01), Takyama
patent: 4868691 (1989-09-01), Kawasaki
patent: 4926271 (1990-05-01), Aoki et al.
patent: 5016122 (1991-05-01), Meunier et al.
Patent Abstracts of Japan, vol. 7, No. 30, Feb. 5, 1983, "Magnetic Recording and Reproducing Device", Hisaharu Watanabe.
Hobrecht, "Electronically Switched Tape Audio Processor", IEEE Transactions on Consumer Electronics, vol. CE-24, No. 3, Aug., 1978, pp. 318-327.
Dufossez et al., "A Low Noise One Chip Playback Record Head Amplifier For VCR", International Conference on Consumer Electronics, Jun., 1988, pp. 28-29.
Canney Vincent P.
SGS-Thomson Microelectronics S.A.
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