Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-11-12
1977-07-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 324 99D, H03K 1302
Patent
active
040343642
ABSTRACT:
An integrator consisting of a high gain D.C. amplifier, a voltage-current converter such as a resistor, and a feed-back capacitor. An unknown analog input voltage to be converted and two known reference analog voltages which have the same polarity as that of the input voltage to be converted are supplied to the voltage-current converter in the integrator through a first switching circuit having three switches. The output voltage of the integrator is supplied to a comparator. The comparator compares the integrated voltage with a fixed reference voltage and produces an output signal when both voltages are equal. A second switching circuit including one switch, a third switching circuit including two switches, and two capacitors respectively connected to the switches in the third switching circuit are provided between an output terminal of the integrator and ground. A voltage-current converter such as a resistor or a transistor circuit is connected between the input terminal of the D.C. amplifier and the interconnecting point of the second and third switching circuits. Each switch in the first, second and third switching circuits, is controlled by a switch control circuit. The switch control circuit includes counters, flip-flops, calculating circuits and delay circuits. A voltage corresponding to one of the two known reference voltages is stored in one of the two capacitors connected to the ground and a voltage corresponding to the other known reference voltage is stored in the other capacitor connected to the ground. A combined voltage of the input voltage and the voltage stored in one of the two capacitors and a combined voltage of one of the reference voltages and the voltage stored in the other capacitor are respectively integrated by the integrator. As a result thereof, a digital quantity representative of the ratio of the unknown input voltage and the difference between the two reference voltages is obtained by the switch control circuit.
REFERENCES:
patent: 3895376 (1975-07-01), Uchida
patent: 3906486 (1975-09-01), Phillips
patent: 3942174 (1976-03-01), Dorey et al.
patent: 3943506 (1976-03-01), Peattie
patent: 3958236 (1976-05-01), Kelly
Fukuda Takeo
Tashiro Isao
Sloyan Thomas J.
Tokyo Shibaura Electric Co. Ltd.
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