Signal conversion circuit

Details Signal conversion circuit Signal conversion circuit

1982-03-22

1984-08-21

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

377 42, 377107, H03K 1302

Patent

active

044673191

ABSTRACT:
This invention relates to a signal conversion circuit, and more particularly to a signal conversion circuit to convert a digital signal sampled in synchronism with a sampling pulse into a pulse width signal having a pulse width corresponding to the digital value of the digital signal.
A first counter is preset to a first count value corresponding to the digital value of the sampled digital signal and begins to count a first clock signal having a predetermined pulse period from the first count value. A second counter is preset to a second count value which is a complement of the first count value and begins to count a second clock signal having a pulse period twice as many as that of the first clock signal from the second count value in response to the detection of a full count of the first counter. A rising edge of the pulse width signal responds to the detection of the full count of the first counter and a falling edge thereof responds to the detection of a full count of the second counter whereby the center of a pulse width of the pulse width signal has a predetermined phase relation to the sampling pulse.

REFERENCES:
patent: 3648275 (1972-03-01), Bower
patent: 4139840 (1979-02-01), Mogi
patent: 4330751 (1982-05-01), Swain

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