Analog-to-pulse density converter

Details Analog-to-pulse density converter Analog-to-pulse density converter

1977-03-03

1979-05-29

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347NT, H03K 1302

Patent

active

041568710

ABSTRACT:
The analog-to-pulse density converter of U.S. Pat. No. 3,955,191 is modified to provide high stability gain with temperature compensation, auto-centering and defined d.c. offset to reduce noise at low signal levels. The modified circuit has reduced power dissipation. The modulator has a stabilized current switching circuit feeding an RC network which is terminated by two D-type flip flops clocked by a high frequency pulse train. Negative feedback from both of the flip flops causes the circuit to generate a pulse density modulated (PDM) output signal related to a given input signal.

REFERENCES:
patent: 3480948 (1969-11-01), Lord
patent: 3810151 (1974-05-01), Johnston
patent: 3859654 (1975-01-01), Harrison
patent: 4009475 (1977-02-01), DeFreitas

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