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US 3,939,311 AGranted
Muting circuit for subscribers telephone
AssigneeGTE Automatic Electric Laboratories Incorporated
InventorJames W. Smith
Life of this patent
Estimating the term…
Abstract
A subscribers telephone circuit that includes automatic muting of signals reproduced by a transducer contained within the subset, each time the telephone's handset is removed from its cradle. The circuit employs electronic techniques to eliminate the need for additional contacts on the hook switch to provide the necessary muting.
Claims7
A telephone subscriber subset including:
- a transducer;
- a hook switch connected to a source of biasing potential;
- an input terminal connected to a source of audio signals;
- and a muting circuit connected between said terminal and said transducer initially operated to couple audio signals from said terminal to said transducer at substantially the same level as received at said terminal;
- said muting circuit further including a circuit connection to said hook switch wherein biasing potential is conducted to said muting circuit in response to an off-hook condition of said hook switch so that the level of said audio signals conducted from said terminal to said transducer is reduced.
2 more elements
Dependencies are inferred from the claim text.