Echo suppressor using comb filters
阅读：302发布：2022-03-28
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1. IN COMBINATION, A TWO-WAY COMMUNICATION SYSTEM COMPRISING FIRST AND SECOND TERMINAL STATIONS FOR THE TRANSMISSION OF SIGNAL ENERGY, A FIRST PATH FOR TRANSMISSION OF SIGNAL ENERGY FROM SAID FIRST TERMINAL STATION TO SAID SECOND STATION AND A SECOND PATH FOR TRANSMISSION OF SIGNAL ENERGY FROM SAID SECOND STATION TO SAID FIRST STATION, ECHO SUPPRESSING MEANS COMPRISING A VARIABLE ATTENUATOR CONNECTED IN SAID FIRST PATH TO INTRODUCE LOSS THEREIN IN PROPORTION TO THE LEVEL OF THE SIGNAL ENERGY IN SAID SECOND PATH AND A VARIABLE ATTENUATOR IN SAID SECOND PATH TO INTRODUCE LOSS THEREIN IN PROPORTION TO THE LEVEL OF THE SIGNAL ENERGY IN SAID FIRST PATH, AND ATTENUATING MEANS IN EACH OF SAID FIRST AND SECOND PATHS, SAID ATTENUATING MEANS HAVING EQUALLY SPACED ALTERNATING ATTENUATION AND PASS BANDS THROUGHOUT THE FREQUENCY SPECTRUM OF THE BAND OF SIGNAL ENERGY TO BE TRANSMITTED, THE ATTENUATION BANDS OF SAID ATTENUATING MEANS IN SAID FIRST PATH COINCIDING WITH THE PASS BANDS OF SAID ATTENUATING MEANS IN SAID SECOND PATH.
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