Title :
Echo cancellation and applications
Author :
Murano, Kazuo ; Unagami, Shigeyuki ; Amano, Fumio
Author_Institution :
Fujitsu Lab., Kanagawa, Japan
Abstract :
Practical echo cancellation techniques, in particular, those used in telecommunications, are reviewed. The various situations in which echoes are generated are examined. Echo path modeling techniques and adaptive algorithms for coefficient control are reviewed. Current international standardization activities are discussed, and echo canceler implementation considerations are set forth. These include echo cancelers for telephone circuits, echo cancelers for full-duplex data transmission over voice channels, acoustic echo cancelers, and echo cancelers for ISDN digital loop transmission.<>
Keywords :
ISDN; adaptive filters; data communication systems; echo suppression; standardisation; telephony; ISDN digital loop transmission; acoustic echo cancelers; adaptive algorithms; adaptive filtering; coefficient control; echo cancellation; echo path modelling; full-duplex data transmission; international standardization activities; telecommunications; telephone circuits; voice channels; Acoustic waves; Adaptive filters; Echo cancellers; Finite impulse response filter; Hybrid power systems; Large scale integration; Loudspeakers; Microphones; Telecommunications; Telephony;
Journal_Title :
Communications Magazine, IEEE
