Acoustic to pulse code transducer

Details Acoustic to pulse code transducer Acoustic to pulse code transducer

1975-03-31

1976-05-18

Robinson, Thomas A.

Communications: electrical

Audible indication

Percussion-type sound producer

340347P, 179111R, 179 15A, H04R 2300, H04J 306

Patent

active

039582370

ABSTRACT:
A transducer in a telephone handset converts acoustic signals into a digital pulse code. The transducer receives enable pulses from a concentrator system which services a group of telephones and converts each of these pulses into a group of time separated pulses having equal pulse widths. These pulses are applied to a binary coded variable capacitive coupling device. An acoustic device converts the acoustic signal into a related displacement of an output member which in turn couples to a movable capacitive plate in the capacitive coupling device. The output of the transducer is a binary word related to the value of the acoustic signal, the word being generated with each occurrence of the enable pulse. The concentrator has a clock and a pulse distributor for providing enable pulses at different intervals for each telephone set being services. Circuitry is also provided for putting in separate time frames all pulse code signals for all telephones on a twisted pair of conductors connecting the concentrator and the central office.

REFERENCES:
patent: 3440642 (1969-04-01), Levine
patent: 3467957 (1969-09-01), Levine
patent: 3626096 (1971-12-01), Von Muench
patent: 3796835 (1974-03-01), Closs et al.
patent: 3851302 (1974-11-01), Schmitt

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