Tokyo Shibaura Denki Kabushiki Kaisha

Taira Nishizono

Yutaka Murao

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.

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Taira Nishizono