Method and apparatus for decreasing a transition time of a read

Details Method and apparatus for decreasing a transition time of a read Method and apparatus for decreasing a transition time of a read

1993-07-30

1995-01-10

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 64, G11B 1512, G11B 1514

Patent

active

053812778

ABSTRACT:
A device for switching from the write mode to the read mode includes a read head connected between a first and a second input terminal of the differential amplifier, the second input terminal being connected to a constant voltage through a capacitor and to the amplifier output through the resistor. The apparatus includes a circuit for generating a voltage ramp, after a write operation; a circuit for discharging an initial current in the read head proportionally to the voltage ramp between the beginning of the ramp and a first threshold voltage of the ramp; a switch for shorting the resistor to a low value, at least between the first threshold voltage and a second ramp threshold voltage; and a detector for detecting the second threshold voltage and for providing, in the vicinity of the threshold, a progressive control of the switch.

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IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987, New York, U.S., pp. 220-224, Naomichi Nishimoto, et al., "VHS VCR With Index and Address Search Systems".

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