Patent · US Expired

Method of and circuit arrangement for establishing conference connections in a switching system

US4607362A · kind A · utility

6Cited by

11References

21Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Peter Vary · Herzogenaurach, DE
Rudolf Hofmann
Karl Hellwig · Wonfurt, DE

Key dates

Filing date	Aug 20, 1984
Grant date	Aug 19, 1986
Priority date	—
Expiry date	Aug 20, 2004

Classification

Technology area (CPC H)Electricity
CPC primaryH04M3/568
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

During algebraic summing of code words from conference participants to form a partial sum-code word overflow of the values may occur. Such an overflow can be prevented when prior to the adding operations the numerical range is extended and an adjustment of weighting factors is effected in dependence on the measured speech intensity of the partial sum-code word. By multiplying by these (attenuation) factors the outgoing subscriber-code word is mapped again on the original numerical range in the attenuation circuit. To reduce a noise level originating, for example, from line interferences, quantization errors, etc. subscribers which are currently not speaking can be attenuated in a further attenuation control circuit of the conference arrangement.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.