Analog-digital converter

Details Analog-digital converter Analog-digital converter

1975-10-24

1977-12-13

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03K 1320

Patent

active

040632369

ABSTRACT:
An analog-digital converter which comprises first and second signal input terminals selectively supplied with any of an input analog voltage and first and second reference voltages having the same polarity as said input analog voltage but different levels from each other; an integration circuit consisting of first and second integration resistors having substantially the same value of resistance and connected to the corresponding first and second input terminals, a D.C. amplifier provided with an inversion input terminal selectively connected to the first and second integration resistors and a noninversion input terminal impressed with a voltage whose level lies intermediate between those of the first and second reference voltages, and an integration capacitor connected between the output terminal of the D.C. amplifier and inversion input terminal; an analog comparator, one input terminal of which is connected to the output terminal of the D.C. amplifier and the other input terminal of which is impressed with a voltage having a reference level for comparison; and a control circuit including means for applying the first reference voltage to the first and second signal input terminals for a prescribed time T.sub.1, means for impressing the second reference voltage on the first and second signal input terminals and measuring a time T.sub.2 required for an analog comparator to generate an output signal after coincidence is established between the levels of the second reference voltage and comparison reference voltage, means for determining a difference .DELTA.T between the aforesaid times T.sub.1, T.sub.2, means for specifying a prescribed time T.sub.3 according to said difference .DELTA.T, and means for supplying the input analog voltage to the first signal input terminal only for the substantial first half T.sub.3 /2 of said specified prescribed time T.sub.3, impressing the first or second reference voltage on the second signal input terminal, supplying the first signal input terminal with the reference voltage previously impressed during the first half T.sub.3 /2 of said specified prescribed time T.sub.3, and conducting the input analog voltage to the second signal input terminal.

REFERENCES:
patent: 3733600 (1973-05-01), Hellwarth
patent: 3735394 (1973-05-01), Eto
patent: 3736586 (1973-05-01), Donjon
patent: 3828347 (1974-08-01), Sacks
patent: 3842416 (1974-10-01), Eto
patent: 3872466 (1975-03-01), Wold
patent: 3942173 (1976-03-01), Wold

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