Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-07-06
1983-04-26
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
324 99D, H03K 1302, H03K 1320
Patent
active
043814980
ABSTRACT:
Microprocessor controlled analog-to-digital converting apparatus. For each analog signal input line there is a comparator having one input connected to the associated analog signal input line. A ramp generator is connected in common to the other input of all of the comparators. A multiplexing arrangement is operated by the microprocessor to couple a selected one of the comparators to a storage register in the microprocessor. The selected comparator compares the voltage of the analog input signal to the ramp voltage. If the analog voltage is higher, the comparator output remains inactive and the microprocessor causes a count to be stored in the storage register. The ramp generator is toggled to increase the ramp voltage by a predetermined step. The comparison of the analog voltage and ramp voltage is repeated. If the comparator output remains inactive, another count is accumulated in the storage register and the ramp generator is toggled to increase its voltage by another step. The procedure continues until the ramp voltage exceeds the analog signal voltage and the comparator output becomes active. The microprocessor then causes the multiplexing arrangement to uncouple the selected comparator from the storage register. The accumulated count in the storage register is a digital representation of the analog signal voltage.
REFERENCES:
patent: 3448446 (1969-06-01), James et al.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 274-281, 396-399.
Hnatek, A User's Handbook of D/A and A/D Converters, John Wiley & Sons, 1976, pp. 262-268.
Susskind, Notes on Analog-Digital Conversion Techniques, The Technology Press, MIT, 1957, pp. 5-2 to 5-11.
GTE Laboratories Incorporated
Keay David M.
Sloyan T. J.
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