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:
Aug. 04, 1981
Filed:
Oct. 17, 1979
Raymond G Taylor, Shreveport, LA (US);
Western Electric Company, Inc., New York, NY (US);
Abstract
A speech network (11) for a telephone set including a receiver (12) circuit and a transmitter (13) circuit connected in parallel between a tip lead (16) and a ring lead (17). An amplifying transistor (Q4) can be connected in either of two modes, including a normal receive mode for amplifying received signals from the line and applying the amplified receive signal to the receiver circuit. A voice-operated switching unit (Q6,20) is provided for sensing a voice-signal output from the transmitter and connecting the transistor (Q4) in a transmit mode, in which the transistor amplifies the transmitter output for transmission to the line. A sidetone generating circuit (R31, Q5) is connected in parallel with the receiver circuit in the transmit node, for applying a reduced portion of the amplified transmit signal to the receiver.