Digital to analog converter

Details Digital to analog converter Digital to analog converter

1981-08-17

1983-06-21

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

377 42, 377 52, H03K 1302

Patent

active

043896375

ABSTRACT:
A digital to analog converter utilizes a digital missing pulse detector as a time interval measuring means in which the detector includes a programmable counter, the count of which is set to correspond with the digital number or word to be converted. Clock pulses at a high frequency are applied to advance the programmable counter from a reset condition to a terminal or output condition, and the time interval produced depends upon the binary word or number set into the programmable counter. Pulses at a second lower frequency, equal to the repetition rate of the system, are applied to the input of the time interval measuring circuit; so that the output is a series of pulse width modulated pulses having a duty cycle corresponding to the binary word originally set into the programmable counter. A low pass filter is connected to the output of the time interval measuring circuit and provides an analog output signal at a voltage level corresponding to the binary number or word originally set into the programmable counter.

REFERENCES:
patent: 3178564 (1965-04-01), Klahn
patent: 3576575 (1971-04-01), Hellwarth
patent: 3646545 (1972-02-01), Naydan
patent: 4117476 (1978-09-01), Koyanagi
patent: 4258355 (1981-03-01), Edwards

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