Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-08-12
1976-06-22
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
324 99D, H03K 1302
Patent
active
039654672
ABSTRACT:
The analog-to-digital converter comprises a comparator having first and second inputs, and an output. A first switch is capable of connecting a signal to be measured to the first input and a second switch can connect a reference source to said first input. A capacitor is connected between said second input and the reference source and serves to store a charge fed by way of a feed back loop from the output of the comparator. The feed back loop includes current generator means arranged to provide a positive or negative current at the second input until the charge is equalized and change of state occurs at the comparator output. A selector means determines the polarity of the current from the generator means depending upon the state of the output from the comparator. A counter determines the number of counting pulses emitted from a pulse generator during a counting period in which the current generator means is applied to the comparator. After the counting period a settling period occurs where the charge on the capacitor is held and then a discharge period follows in which the capacitor is discharged via the current generator means by means of a current of opposite polarity to that used during the charging period. The measurement cycle thus comprises four periods which include two active and two non-active portions.
REFERENCES:
patent: 2994825 (1961-08-01), Anderson
patent: 3368149 (1968-02-01), Wasserman
patent: 3480948 (1969-11-01), Lord
patent: 3509460 (1970-04-01), Mizrahi
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patent: 3760407 (1973-09-01), Terry
patent: 3872466 (1975-03-01), Wold
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