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:
Nov. 09, 1993
Filed:
May. 21, 1991
Applicant:
Inventor:
Rudolf Hofmann, Forchheim, DE;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ; H04M / ;
U.S. Cl.
CPC ...
370 62 ; 370 79 ; 370 80 ; 379158 ; 379202 ;
Abstract
A telephone switching system, or teleconferencing arrangement, in which each participant hears all the other speakers but does not hear his own voice. The speech intensity of each participant is measured and subtracted from a signal which is based on the sum of all the other participants then speaking. This difference signal is then compared with a threshold to determine if this participant is rated 'speaking' (signal to be added for others to hear) or 'listening'. The speech intensity signal is multiplied by a weighing factor based on this comparison, before adding to the other weighted signals to form the sum signal.