[Speex-dev] need a help for using AEC

[Johnson Peng]

speex-devDear Jean-Marc Valin 
     I got some problems with evaluating the AEC module of speex. I wrote a test main function and compiled it with the speex lib in VC6.0, it initialized the AEC state and called the AEC main function in the same way as what was done in testecho.c. The near-end input wave file was a simple delaying and adding version of the far-end input wave, eg. y(n) = 0.5*x(n-100)+ 0.2*x(n-200)+ 0.1*x(n-300) . The max delay was ensured to be less than the setting echo tail length of AEC, but the output e(n) was not an echo canceled verson of x(n), It seemed that the ^h(n) never converged to the real impulse response h(n), why?  and I didn't suspect the input files because the same x(n) and y(n) input could work well in another simple time-demon nlms AEC method which was implemented in malab.   	
      
　　　　　　　　

best regards,
 				

　　　　　　　　   Johnson Peng
　　　　　　　　p_yuanjiang at sina.com
　　　　　　　　　　2006-09-29