A method and an echo canceller for echo cancellation with several adaptive filters connected in cascade.

摘要

The invention relates to the removal of ECOS WITH THE HELP OF A SERIES OF ADAPTABLE cascaded FILTERS ({SUB 31, SUB 1} -31 {N}, where each filter creates an output signal TO ELIMINATE THEIR PART RESPECTIVE SIGNAL A blip on a line (12,34) FORMING PART OF IN-wire circuit. pREFERABLY, filters BE ABLE TO cONVERGE qUICKLY, at least for relatively short impulse responses, and providing a ELIMINATION ECHOES eFFECTIVE FOR DIFFERENT TYPES impulse response. NECESSARY FILTERS FOR THE ELIMINATION OF ECHOES CURRENTLY WARRANT CALCULATING A measure of special quality for each filter. The echo signal REDUCED OBTAINED (E {SUB, TOT}) EQUALS THE DIFFERENCE BETWEEN THE SIGNAL WITH ORIGINAL AND ECO THE SUM OF SIGNALS OUT THE NECESSARY FILTERS FOR THE ELIMINATION OF ECHOES. These filters have been updated with the echo signal REDUCED (E {SUB, TOT}), while the rest OF FILT ROS are updated with signals obtained RESULT OF THE DIFFERENCE BETWEEN THE REDUCED ECO SIGNAL AND SIGNAL OUTPUT FILTERS RESPECTIVE (EG. AND SUB {2}.