the code is extracted from the SPEEX Echo news from the source. it is taken in the frequency domain for operation and the results were quite good (Echo Canceller function source code)

arch.h
echo.cpp
echo.dsp
echo.dsw
fftwrap.c
fftwrap.h
fixed_generic.h
input_exsample_stereo.pcm
kiss_fft.c
kiss_fft.h
kiss_fftr.c
kiss_fftr.h
left.pcm
math_approx.h
mdf.c
misc.c
misc.h
preprocess.c
pseudofloat.h
ReadMe.txt
right.pcm
smallft.c
smallft.h
speexEC.cpp
speexEC.h
speex_echo.h
speex_preprocess.h
speex_types.h
StdAfx.cpp
StdAfx.h
_kiss_fft_guts.h

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