Circuit for electronically generating a call impedance

Details Circuit for electronically generating a call impedance Circuit for electronically generating a call impedance

2006-04-04

2006-04-04

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

C379S398000, C379S373010

Reexamination Certificate

active

07023985

ABSTRACT:
The present invention relates to a circuit for electronically generating a call impedance in telephone terminals, comprising a call alternating voltage that may be tapped between a first and a second input terminal. The inventive circuit has a regulating device with a programmable digital filter for regulating impedance, wherein the transmission function of the regulating device can be adjusted by programming the filter coefficients of the digital filter. The inventive regulating device makes it possible to adapt the call impedance to different country-specific requirements. To this end, the regulating device has a programmable digital filter that may be embodied as a digital signal processor. In an especially preferred embodiment, the digital filter is implemented in the form of a program in the digital signal processor.

REFERENCES:
patent: 5271059 (1993-12-01), Dielacher et al.
patent: 5485516 (1996-01-01), Hauptmann
patent: 5796815 (1998-08-01), Guercio et al.
patent: 6091806 (2000-07-01), Rasmus et al.
patent: 6275581 (2001-08-01), Fischer et al.
patent: 9-46273 (1997-02-01), None
Noll, A. M., Introduction to Telecommunication Electronics, Second Edition, Artech House 1995, pp. 316-317.
Dittmer, G., Linear Technology Magazine, Feb. 1995, p. 3.
BAPT 223 ZV5, issued Feb. 5, 1994, p. 12, chapter 2.6.1.
English Language Abstract of JP-9-46273.

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