Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-07-09
1982-12-28
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347M, H03K 1320
Patent
active
043664687
ABSTRACT:
A charge-balanced analog-to-digital converter including an integrator, a capacitor, two counters and a control circuit. The integrator has two input terminals which are connected to an operational amplifier through separate resistors respectively. One of the input terminals is provided, during a first cyclic period, with a lower potential version of input voltage and during a second cyclic period, with a higher potential version of the input voltage. The other input terminal is provided, during the first and second cyclic periods, alternately with a reference voltage for charging the capacitor and an earth voltage for causing the integrator to be discharged, by discriminating the output of the integrator by means of the comparator. Clock signals which occur during the first and second cyclic periods are counted by one of the two counters, and clock signals which occur when the integrator is being charged during the first and second cyclic periods, are counted by way of summation and reduction by means of the other counter.
REFERENCES:
patent: 4063236 (1977-12-01), Amemiya et al.
patent: 4195283 (1980-03-01), Ishikawa
patent: 4217543 (1980-08-01), Strong
patent: 4243975 (1981-01-01), Masuda et al.
Sloyan T. J.
Toko Inc.
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