Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1982-06-22

1984-11-20

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03K 1302

Patent

active

044841787

ABSTRACT:
The digital-to-analog converter described herein generates an analog signal level from a digital value and a modulation coefficient. The converter modulates the digital word applied to the conversion stages and smoothes the resultant duty cycle modulated analog levels to produce additional analog levels between the normal levels provided by the conversion stages of the DAC. In one embodiment the duty cycle modulation of the digital value is accomplished by a rate multiplier controlling the incrementing of the digital word applied to the conversion stages. In another embodiment of the invention, the duty cycle modulation of the digital word is performed by a microcomputer. A low pass filter or a DC motor is used to smooth or filter the duty cycle modulated levels from the conversion stages.

REFERENCES:
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patent: 3705359 (1972-12-01), Kappes
patent: 3742487 (1973-06-01), Tripp
patent: 3789393 (1974-01-01), Tripp
patent: 3883785 (1975-05-01), Fulcher et al.
patent: 3883786 (1975-05-01), NcNaughton et al.
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patent: 4016558 (1977-04-01), Bishop et al.
patent: 4087754 (1978-05-01), Song
patent: 4109110 (1978-08-01), Gingell
patent: 4243921 (1981-01-01), Tamura et al.
patent: 4254367 (1981-03-01), Sakamoto

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