Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-10-15
1984-07-31
Miller, C. D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347SH, H03K 1302
Patent
active
044633432
ABSTRACT:
In a method of converting an analog input signal to a digital output signal, an analog input voltage is compared with two reference magnitudes which are invariable during the comparing. Both reference magnitudes are derived from an analog signal provided in a previous comparison by adding and subtracting a fixed magnitude representing a quantization step. Both reference magnitudes are simultaneously varied by increments or decrements equal to the steps when the analog input voltage is equal to one or the other of the reference magnitudes. Upon each variation, a pulse is emitted having a plus sign or a minus sign according to whether the analog input voltage reaches one or the other of the reference magnitudes. The number of pulses emitted is algebraically totalled thereby providing a digital indication of the mangitude of the analog input voltage.
REFERENCES:
patent: 3225213 (1965-12-01), Hinrichs
patent: 3588884 (1971-06-01), Quereshi
patent: 3657653 (1972-04-01), Wilkinson
patent: 3745562 (1973-07-01), Rosenbaum
patent: 3753133 (1973-08-01), Shumate, Jr.
patent: 4310830 (1982-01-01), Babini
Mecilec
Miller C. D.
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