Patent · US Expired

Method for determining telephone dial pulse parameters independently of subscriber line length

US4839920A · kind A · utility

6Cited by

5References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Gabriele Held-Elbert · Lochhofen, DE
Wolfgang Kaiser · Munich, DE
Wilhelm Koch · Bongard, DE
Werner Schmutzler · Fürstenfeldbruck, DE

Key dates

Filing date	Aug 25, 1986
Grant date	Jun 13, 1989
Priority date	—
Expiry date	Aug 25, 2006

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q1/36
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A method is disclosed for measuring telephone dial pulse parameters independent of telephone subscriber line length. To avoid distortions resulting from varying subscriber line lengths, there is performed during the first pulse interval of a dial pulse series to be measured, a voltage measurement with results in a value that depends on the line length, and, in accordance with this value, the times measured for pulse interval and pulse duration of the dial pulse series are corrected.

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