Telephonic communications – Line equalization or impedance matching
Patent
1991-01-29
1993-12-14
Dwyer, James L.
Telephonic communications
Line equalization or impedance matching
379399, 379394, H04M 908
Patent
active
052710599
ABSTRACT:
In a method and configuration for forming a line termination at two line terminals of a telephone line, alternating signals are separated from direct signals applied to line terminals, referred to a reference variable and added to a transmission signal from a transmission terminal to form a resultant actual-value signal. The resultant actual-value signal is compared with a reference signal at a gain-controlled amplifier. The reference signal is formed with an impedance transmission function corresponding to a given termination impedance by weighting the alternating signal at one of the line terminals being connected to a current sensor resistor. A current between the line terminals is determined with a control transistor associated with the current sensor resistor. The control transistor is controlled with the gain-controlled amplifier.
REFERENCES:
patent: 4004102 (1977-01-01), Ott
patent: 4503289 (1985-03-01), Spires
patent: 4723278 (1988-02-01), Nishio et al.
patent: 4961219 (1990-10-01), Patel
patent: 5020102 (1991-05-01), Schorr
Dielacher Franz
Formanek Karl
Wallnberger Gerald
Dwyer James L.
Greenberg Laurence A.
Lerner Herbert L.
Shehata M.
Siemens Aktiengesellschaft
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