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:
Mar. 17, 1998
Filed:
Sep. 30, 1996
Applicant:
Inventors:
David Huddart, Bristol, GB;
Robert M Khamashta, Los Gatos, CA (US);
Assignee:
Plantronics, Inc., Santa Cruz, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379387 ; 379395 ; 379430 ; 379-6 ;
Abstract
A telephone interface unit automatically configures itself to couple a headset to a telephone. The interface unit comprises a switch matrix, for coupling various signal lines of the telephone to various signal lines of the headset, and a control logic, for automatically setting the switch matrix. The interface unit also comprises a variable gain circuit, for adjusting the amplitude of signals transmitted by the headset. The control logic automatically adjusts the gain of the variable gain circuit such that the gain of the headset is matched to the gain of the telephone.