Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-06-10
1978-10-03
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03K 1320
Patent
active
041186982
ABSTRACT:
Automatic recalibration and testing of the accuracy of an analog-to-digital converter is accomplished in a converter of the type that compares the analog input signal with a linearly changing ramp referene signal and measures the time interval required for the magnitude of the reference signal to reach the level of the analog input signal from an initial level. In the invention, the linearly changing ramp reference signal is allowed to continue beyond the end of the converter's measuring phase and is thereupon compared with a datum voltage by a comparator which determines when equality between the two occurs. At the end of the measuring phase, a control pulse of fixed duration is generated and if the time of occurrence of equality is within the duration of that pulse, the converter is then operating within a suitable range of accuracy. The converter is automatically recalibrated by adjustment of the reference signal to make equality of the reference signal and the voltage datum occur in the center of the duration of the control pulse.
REFERENCES:
patent: 2897486 (1959-07-01), Alexander
patent: 3506818 (1970-04-01), Smith
patent: 3750142 (1973-07-01), Barnes
patent: 3961325 (1976-06-01), Kendall
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