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, 1998
Filed:
Jan. 26, 1996
Applicant:
Inventor:
Ryuhei Fujiwara, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379406 ; 379390 ; 379409 ; 379410 ; 704233 ;
Abstract
In an echo suppressor for suppressing an echo resulting from acoustic coupling in a telephone apparatus, an attenuator attenuates a transmission signal level with reference to a first level signal representative of a level of a reception speech signal which is supplied to the telephone apparatus. Supplied with the reception speech signal through an input terminal, the first detecting arrangement detects the reception speech signal to produce the first level signal. It is a matter of course that a receiver converts the reception speech signal into a reception speech sound. A microphone produces a transmission speech signal in response to a transmission speech sound.