H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 3/03 (2006.01) H04B 3/23 (2006.01)
Patent
CA 1147035
ABSTRACT OF THE INVENTION "A FOUR-WIRE LINE ARRANGEMENT FOR USE IN A DIGITAL TELECOMMUNICATIONS SYSTEM" ABSTRACT Compensation in a receiving arm of a four-wire line arrangement for cross-talk and echo interference due to signals (S) in the transmitting arm is provided by means of a ROM S (which can be a C-MOS device)in which are stored coded (delta-modulation) compensation signal values .DELTA. derived empirically when the relevant system is first used. A pulse generator T, using the transmitted pulses as clock pulses, drives the ROM S to read out the appropriate compensation signal values which are decoded in a decoder D which supplies the resulting compensation signals to a subtractor V which subtracts the compensation signals k from the received signals e. In an alternative form distortion of received signals is corrected by means of a similar pulse generator - ROM - decoder arrangement in which the pulse generator is driven by the distorted received signals and the decoded compensation signals are added to the distorted signals. (Fig. 1)
352115
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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