The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Mar. 31, 1975
John E Fulenwider, Concord, MA (US);
GTE Laboratories Incorporated, Waltham, MA (US);
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.