Title:
METHOD AND CIRCUIT DEVICE FOR COMPENSATING CROSSTALK AND/OR ECHO SIGNAL
Document Type and Number:
Japanese Patent JPS60136429
Kind Code:
A
Abstract:
In an adaptive crosstalk and/or echo compensation circuit which is arranged on the four-wire side parallel to a hybrid circuit and which has a variable filter and a compensation signal logic-linking element, the compensation signal is formed in dependence upon the, possibly averaged, difference between a decision device output signal formed following the signal compensation and following an adaptive signal equalization, and the decision device input signal. In the case of a greater, possibly averaged, difference between the decision device input and output signals, the filter coefficients are set in accordance with the compensated received signal, or only the sign thereof, and in the case of a smaller, possibly averaged, difference, the filter coefficients are set in accordance with this difference, or only the sign thereof. A compromise equalization of the received signal can take place prior to the crosstalk and/or echo compensation. Following the crosstalk and/or echo compensation, first a regulated amplification can take place, here the setting signal for the variable filter, which signal is derived from the difference between the decision device input and output signals, and when the filter setting signal which corresponds to the compensated received signal is derived from the compensated and amplified received signal, also this setting signal can be multiplied by a factor which is reciprocally proportional to the amplification factor.
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Inventors:
HAINRIHI SHIENKU
Application Number:
JP25208884A
Publication Date:
July 19, 1985
Filing Date:
November 30, 1984
Export Citation:
Assignee:
SIEMENS AG
International Classes:
H04B3/20; H04B3/23; (IPC1-7): H04B3/20
Attorney, Agent or Firm:
Toshio Yano