Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-11-10
1982-11-02
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03K 1320
Patent
active
043576001
ABSTRACT:
A multislope A/D converter is presented which employs a multislope integration technique enabling the use of a single comparator to detect polarity changes in the integrator output voltage. The A/D converter integrates a test signal during a run-up interval and integrates a discharging signal during the run-up interval as well as during a pre-run-down interval and a run-down interval subsequent to the run-up interval. The magnitude and polarity of the discharging signal are regulated in accordance with a switching scheme that converts circuit element mismatch error into offset measurement errors which can be eliminated by subtraction. The discharging current during the pre-run-down interval ensures that the slope of the integrator output voltage at the final polarity change is independent of test signal polarity thereby avoiding a comparator hysteresis error. A decade-run-down technique is employed during the run-down interval enabling the digital conversion to be implemented on a decade counter.
REFERENCES:
patent: 3480948 (1969-11-01), Lord
patent: 3737892 (1973-06-01), Dorey
patent: 4082998 (1978-04-01), Marriott
Fullagar, "Electronics", Dec. 9, 1976, pp. 81-89.
Jones Lawrence T.
Marriott Joe E.
Ressmeyer James
Frazzini John A.
Hewlett--Packard Company
Miller Charles D.
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