Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-09-17
1985-06-04
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347NT, H03K 1302
Patent
active
045217637
ABSTRACT:
An A-D converter for converting into a pulse train signal an analog input voltage signal from a signal source, said A-D converter comprising a signal generator for providing a low analog input voltage signal of a low fixed level V.sub.L, a signal generator for providing a high analog input voltage signal of a high fixed level V.sub.H, a multiplexer connected to the signal source and the signal generators for receiving the signals therefrom and supplying the signals selectively and successively, a V-T converter connected to the multiplexer for converting a selected one of the analog input voltage signals into a pulse train signal; a memory for storing instruction programs used for A-D conversion, a central processing unit, a first counter connected to the V-T converter for counting pulses of the pulse train signal, said first counter being loaded with a specific value supplied from the central processing unit, a clock pulse generator for producing clock pulse, a second counter connected to the clock pulse generator for counting the clock pulses while the first counter is counting the same and a control circuit.
REFERENCES:
patent: 3500196 (1970-03-01), Cooper
patent: 3633202 (1972-01-01), Kuckein
patent: 3725903 (1973-03-01), Kosakowski
patent: 3987435 (1976-10-01), Ikeda
patent: 4034364 (1977-07-01), Fukuda
patent: 4063236 (1977-12-01), Amemiya
Murao Yutaka
Nishizono Taira
Miller Charles D.
Tokyo Shibaura Denki Kabushiki Kaisha
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