Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1982-12-08
1985-10-08
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 29, G11B 2110, G11B 502
Patent
active
045463956
ABSTRACT:
A self-scaling differential signal decoder which accepts first and second input signals and provides an output representative of the difference therebetween which output is scaled as if the sum of the input signals were equal to a predetermined value, avoids the problems associated with slow AGC control circuits and with operational sequence control systems commonly used in such devices and is operable at up to video speeds by exploiting the properties of a transistor differential long-tail-pair amplifier where the ratio between its output currents is proportional to the antilogarithm of the difference between its input voltages, the sum of the output currents is equal to the controlled value of the constant current source and the input to the long-tail pair is provided by a differential logarithmic amplifier, the decoder being employed in a tribit servo-track reader.
REFERENCES:
patent: 4380034 (1983-04-01), Krake
patent: 4412165 (1983-10-01), Case et al.
Burroughs Corporation
Canney Vincent P.
Peterson Kevin R.
Starr Mark T.
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