Method and device for the reading of data

Details Method and device for the reading of data Method and device for the reading of data

1978-04-18

1979-10-16

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

360 45, G06K 708, G11B 119

Patent

active

041714792

ABSTRACT:
The disclosure relates to a method and device for reading data in the form of data pulses in a pulse train. The pulse train is obtained by the sensing of a flexible disc and contains, conventionally, a sequence of clock pulses which, in at least a portion of the pulse train, define mutually subsequent bit cells. These contain at most one of the data pulses. A bistable circuit is switched to its one state by the clock pulses and switched to its other state by the data pulses. The time which has elapsed after each switching of the bistable circuit is measured by means of a time circuit and the bistable circuit is switched if the elapsed time exceeds a value which is settable for each switching. A combinational circuit is provided for setting the above-mentioned level in dependence of the contents of at least the preceding bit cell.

REFERENCES:
patent: 3676644 (1972-07-01), Vaccaro
patent: 3676645 (1972-07-01), Fickenscher
patent: 3932731 (1976-01-01), Moore
patent: 3949313 (1976-04-01), Tamada
patent: 3975769 (1976-08-01), King
patent: 4012791 (1977-03-01), Bleiman

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