Echo compensator

Details Echo compensator Echo compensator

H - Electricity

04

B

340/72

H04B 3/23 (2006.01)

Patent

CA 1332449

ABSTRACT Fig. 1 AN ECHO COMPENSATOR On a trunk line for digital signals, a digital subtractor circuit (3a) and an adaptive transversal filter (7) are connected between the transmitting path (6) and the receiving path (19) in a shunt arm. Digital signals are transmitted on the trunk line (6,19) in the original frequency band of 0.3 to 3.4 kHz. Via a digital adder circuit (11a), a received signal on the receiving path has superimposed a dc voltage or a digital wobble- or noise signal in the original frequency ranges of 0 to 0.3 and 3.4 to 4 kHz, which are generated in a digital additional signal generator (15a). This inhibits the coefficients from moving out a given range. When analogue-to-digital and digital-to-analogue converters are included for the digital operation of the adaptive transversal filter (7), connection to analogue trunk lines is also possible. These echo compensators are used in particular in international gateway exchanges.

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