D/A converter

Details D/A converter D/A converter

1986-05-27

1987-04-07

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

318599, H03M 182

Patent

active

046564608

ABSTRACT:
A D/A/ converter for use in a microprocessor comprises first and second timers (3A, 3B), first and second modulus latches (2A, 2B) associated respectively with said first and second timers for holding respective digital values, the timers being arranged to produce first and second respective overflow signals (4A, 4B) at predetermined counts, wherein said second overflow signal (4B) causes said first and second timers (3A, 3B) to be reset to the digital values held in said respective latches (2A, 2B), and bistable means (6) for receiving said overflow signals and producing an output at a first level in response to said first overflow signal and at a second level in response to said second overflow signal, whereby the pulses so produced form a pulse width modulated signal whose duty cycle is representative of the ratio of said respective digital values held in said respective latches.

REFERENCES:
patent: 3648275 (1972-03-01), Bower
patent: 4383245 (1983-05-01), Cooley

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