Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-06-21
1980-07-01
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, H03K 1302
Patent
active
042109035
ABSTRACT:
Analog signals are converted into digital form in a reproducible, accurate and stable manner. The tri-dual phase technique involves the conversion of the condition to be measured, and typically represented by a voltage, first to a reference level and then to an unknown level in a dual phase conversion, and then solving for the unknown level once the relationship of the reference level, the unknown high input level, and the unknown low input levels are established. A circuit capable of carrying out the technique includes an integrator receiving voltage input signals from a switching device adapted to switch to three different input signals, including a high unknown signal level, a low unknown signal level, and a known signal reference level. The reference level is also fed into a comparator which receives the output of the integrator. Calculating circuitry is provided for the output of the comparator for processing the output and presenting the results thereof in a digital display format or other digital output.
REFERENCES:
patent: 3185820 (1965-05-01), Williams et al.
patent: 3500196 (1970-03-01), Cooper
patent: 3555298 (1971-01-01), Neelands
patent: 3566265 (1971-02-01), Reid
patent: 3654560 (1972-04-01), Cath et al.
patent: 3710376 (1973-01-01), Fluegel
patent: 4031533 (1977-06-01), Neumann
patent: 4034364 (1977-07-01), Fukuda et al.
Semiconductor Circuits, Inc.
Sloyan Thomas J.
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