AEC echo cancellation, source code, very valuable, you can use free of charge,

Packet : 63535273aec.rar filelist
src\cb.cpp
src\cb.h
src\ec.cpp
src\ec.h
src\ec_constants.h
src\ec_main.cpp
src\gecho.cpp
src\gecho1.cpp
src\ulaw.cpp
src

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