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:
Apr. 23, 1996
Filed:
Feb. 18, 1994
Applicant:
Inventor:
Bernhard Gloess, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
370 62 ; 3701104 ; 379202 ;
Abstract
A circuit arrangement sets up conference calls in a digital time-division multiplex telecommunications switching center. For setting up three-party connections, a conference unit (KE) having a PROM is provided wherein are stored all possible, companded sum and difference values of individual contributions of respectively two conference participants. These are selected by the individual contributions as read selection addresses. The PROM thus realizes the functions of linearization of the sum and difference and of companding that are performed by separate sub-units in previous conference units.