Method and apparatus for analog-to-digital conversion

Details Method and apparatus for analog-to-digital conversion Method and apparatus for analog-to-digital conversion

1984-10-22

1986-11-04

Miska, Vit W.

Communications: electrical

Audible indication

Percussion-type sound producer

340347NT, H03K 1302

Patent

active

046212558

ABSTRACT:
One analog signal is selected out of a plurality of analog signals by a multiplexer and a capacitor is electrically charged though such a switch as adapted to be closed/opened by a start signal, and thereafter the capacitor is caused to discharge with a constant current with the switch opened. A level discriminating signal is led out when a voltage of the capacitor discharging goes below a predetermined discriminating level after the switch is opened. A stop signal is generated as a result of a logical operation of the analog signal and the level discriminating signal by an AND gate. A processing circuit accepts the stop signal and calculates a digital value corresponding to a time period from the time that the switch is opened to the time that the level discriminating signal is generated, and then moves to a subsequent processing operation.

REFERENCES:
patent: 3368149 (1968-02-01), Wasserman
patent: 4024533 (1977-05-01), Neumann
patent: 4191942 (1980-03-01), Long
patent: 4268820 (1981-05-01), Hareyama

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