Digital/analog converter

Communications: electrical – Audible indication – Percussion-type sound producer

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H03M 182

Patent

active

047423293

ABSTRACT:
A digital/analog converter of the present invention is a pulse width modulation type, and is provided with a 2.sup.N (N: the number of bits of digital data to be converted) notation counter circuit for counting clock pulses, pulse formation circuit which is given the counting output of the counter circuit and the digital data and outputs a pulse signal being varied its pulse width and pulse cycle period corresponding to the contents of the digital data and being decided the sum of the pulse widths of the pulse signal in the 2.sup.N clocks period corresponding to the same, and means which selects corresponding to the pulse one of two potentials different in level and which composed the selected potential, so that the harmonic spectrum of an analog signal obtained as the output of the composite means is larger in the high band and smaller in the low band, resulting in that the digital/analog converter less in the harmonic distortion without using resistance of high accuracy is obtainable.

REFERENCES:
patent: 3298014 (1967-01-01), Stephenson
patent: 3577084 (1971-05-01), Atcherson
patent: 3603977 (1971-09-01), Szabo
patent: 3646545 (1972-02-01), Naydan
patent: 3838416 (1974-09-01), Brown
patent: 3887911 (1975-06-01), Bell
patent: 3984829 (1976-10-01), Zwack

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