Speex dev - Dec 2009 - AEC Troubles

Hello,

We are experiencing a few problems with Speex AEC. We are using it to
process audio data on a real time stream over IP with Speex codec (frame
size = 320).

We initialize the echo state like this :


SpeexEchoState * echo_state;
echo_state = speex_echo_state_init(320,512);


int sr = 16000;
speex_echo_ctl(echo_state,    SPEEX_ECHO_SET_SAMPLING_RATE,&sr);


We are not really sure about the values in parameters, please tell us if
you see something wrong about them.

we process the data like this :

speex_echo_cancellation(echo_state,target,source,out);

the output stream is almost the same as the input one, meaning there is
not a really efficient echo cancellation when we use this.


What do you think could go wrong here?

PS : we are using Speex 1.2 RC1

We're looking forward to hearing from you.

Best regards.


Julien Beltzung.

On 16/12/09 10:15, Julien Beltzung wrote:
>
> Hello,
>
> We are experiencing a few problems with Speex AEC. We are using it to
> process audio data on a real time stream over IP with Speex codec (frame
> size = 320).
>
> We initialize the echo state like this :
>
>
> SpeexEchoState * echo_state;
> echo_state = speex_echo_state_init(320,512);
A tail length of 512 seems a bit short at 16 kHz. As usual, could also 
be a sync problem. Did you RTFM?

	Jean-Marc