Method for periodic digital to analog conversion

Details Method for periodic digital to analog conversion Method for periodic digital to analog conversion

1981-11-12

1983-08-23

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

044006926

ABSTRACT:
For converting a digital value into an analog value, the digital value is first converted into a binary number and then selected auxiliary pulse trains corresponding to the binary number are used to control a switch which connects a capacitor alternatively to a reference voltage source or to ground to charge the capacitor to a voltage which corresponds to the converted analog value. The pulses in the auxiliary pulse trains associated with each binary position are grouped into pulse groups and the pulse groups of each pulse train are distributed over the duration of a conversion period in such a manner that during the superimposition of auxiliary pulse trains the number of pulse groups is not increased but the existing pulse groups are widened by being placed next to each other. In addition, the width of the single pulses forming the pulse groups is doubled so that the pulse groups are transformed into width-modulated pulses.

REFERENCES:
patent: 2907021 (1959-09-01), Woods
patent: 3831167 (1974-08-01), Tewksbury
Glick, "Proceedings of the Western Computer Conference", Feb. 1957, pp. 128-133.

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