Displaying 20 results from an estimated 7000 matches similar to: "Speex 1.1.9 is out -- Try the new echo canceller"
2006 Dec 05
2
problem with echo cancellation
Hello Jean-Marc,
I solved the variable delay problem, but I still have trouble with
speex_echo_cancel(). When i try testecho.c with clean speech for far-end input
and same speech with attenuation, a bit of reverb and 50-150 ms delay, all this
done in sound editor, for mic input, i get 5-8 db attenuation.
But when i use the same speech played and recorded for mic input, i see about 5
db of
2011 Feb 10
2
About Sampling Rate Correction in acoustic echo
Thank you, Andreas Engel.
I downloaded the white paper of the Fraunhofer Acoustic Echo Control.
http://www.iis.fraunhofer.de/bf/amm/download/whitepapers/Acoustic_Echo_Control-wp.pdf
It said
> "In the Fraunhofer Acoustic Echo Control, the frequency spectrum of the microphone signal is
> modified so that the undesired echo components are removed from the signal transmitted to
> the
2005 Nov 09
2
Re: aec
I ran some further tests on mdf and here are the
results:
1. reduced tail length to 100ms, aligned mic and
speaker signals to within 10ms - almost no echo
attenuation
2. aligned mic and speaker signals to within 5 samples
- still almost no echo attenuation
3. ran testecho using the same file for mic and
speaker - very good echo cancellation (of course this
is expected, but I needed to do a sanity
2005 Nov 09
1
Re: aec
I'm pretty much sure of it. When I test inverting the
inputs, my output is pretty much the same as my
speaker signal. Whereas the way that I normally test
the output is my mic signal with very little
attenuation.
If you are interested I can send my test files; they
are about 94KB each.
-Jason
--- Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
wrote:
> Are you sure you're
2006 Dec 05
0
problem with echo cancellation
Hi Julia,
Version 1.2-beta1 has a bug in the echo canceller. Try either svn or
1.1.12 -- or apply this patch to 1.2beta1:
https://trac.xiph.org/changeset/11882
Jean-Marc
julia rg a ?crit :
> Hello Jean-Marc,
>
>
>
> I solved the variable delay problem, but I still have trouble with
> speex_echo_cancel(). When i try testecho.c with clean speech for far-end input
> and
2011 Feb 10
0
About Sampling Rate Correction in acoustic echo
I can only evaluate this with my subjective point of view. I had a
special test scenario doing chat with cheap webcam microphones and
loudspeakers. Fraunhofers solution was the only one that could eliminate
the echo. In double talk the quality gets lower but is still very good.
You might want to ask Fraunhofer for a demo version to test for yourself.
I have no details on the algorithms being
2006 May 11
0
Echo Canceller Memory Usage, Frame Size
(from thread Re: [Speex-dev] Speex echo canceller on TI C55 DSP, but this is
a more general topic)
>> With these changes, the link was successful, using testecho.c with some
>> modifications for the C55 environment. The code and data memory
>> requirements were a lot more than I had hoped (>20kbytes of dynamic data
>> memory for block size=128, tail length = 1024),
2005 Nov 10
2
Re: aec
Had a try. The reason why a simple delay is not that good is mainly due
to the initialization of the filter parameter that still takes a few
seconds (if they are perfectly in sync, you sort of get lucky).
Otherwise, you real recording seems to have something odd in it. Are you
sampling from a different card then the one that's playing the sound? or
maybe the mic (or something else) in the room
2005 Nov 06
2
Re: aec
Thanks for alerting me to the new changes. I just
tried the latest code from SVN, but unfortunately I
still have just about the same results. The estimated
echo that gets subtracted from the actual echo is such
a small signal that it doesn't really result in any
noticeable echo attenuation.
I currently have my filter size set to 2 seconds even
though the echo in my microphone file is only
2006 May 09
2
Speex echo canceller on TI C55 DSP
> I built and ran the same test on the TI C64 simulator, and the echo was
> canceled nicely (about 10:1 reduction in the peak amplitude during the
> second of two brief speech bursts). So, my problem must again be related to
> the 16-bit processing on the C5X DSPs.
Good. At least we've narrowed it down a bit.
> Also, the line where it is hanging is:
>
2006 May 09
0
Speex echo canceller on TI C55 DSP
>Just tried your files and I'm not running into any infinite loops and
>the cancellation works fine. Unless the C6x has the same problem, I
>suspect a 16-bit problem. I'll check and see if I find something. About
>the r=0 problem, I can't find where it ends up in a denominator, so I
>suspect is not (directly) the problem.
I built and ran the same test on the TI C64
2010 Feb 20
1
Manual scratch allocation : memory usage doubt
Hi,
I am currently encoding 32 Khz/Qual-10/UWB encode mode, with
MANUAL_ALLOC enabled ( similar to the c5x/c6x configuration).
In file sb_celp.c, I noticed the scratch memory grow during
recursive (UWB -> WB) calls to 'sb_encode'.
1. 'stack' was not tracked (with 'tmp_stack' as done at other palaces)
after/before - auto-correlation/Levinson-Durbin scope (~line
2006 May 08
5
Speex echo canceller on TI C55 DSP
Hi Jim,
I've just been made aware of these problems (look for the thread "speex
echo cancellation limitations"). It's on my short-term TODO list.
> If fftwrap.c, I ifdefed out the spx_fft_float and spx_ifft_float routines,
> because there were not used and required smallft.c (which is not so small at
> all) to be added to the build.
Right, need to cleanup that
2014 Jun 09
1
High Sampling Rates
? Do you have any references for me to investigate, I am trying to understand how noise is reduced by introducing higher sampling rates. (I tried to search, but maybe it is so obvious that nobody even explains it)
This is not very obvious. It requires you to understand basic signal processing theory. I will give some pointers below.
Any physical signal (e.g. audio coming out of speaker, current
2015 Apr 02
1
Opus multi-stream/surround: Audio corruption on decoded content
Hello Everyone,
I am using the opus 1.1 multistream APIs to encode a 5.1 surround stream on the server, stream it to client, decode it and capture the pcm data. I noticed that there was severe corruption/attenuation on one of the channels(specifically Back/Rear Right). This would appear to be the last channel in the stream. I am attaching an image of the PCM dumps from the original and the one
2006 May 09
2
Speex echo canceller on TI C55 DSP
Just tried your files and I'm not running into any infinite loops and
the cancellation works fine. Unless the C6x has the same problem, I
suspect a 16-bit problem. I'll check and see if I find something. About
the r=0 problem, I can't find where it ends up in a denominator, so I
suspect is not (directly) the problem.
Jean-Marc
Le lundi 08 mai 2006 ? 20:05 -0400, Jim Crichton a ?crit
2006 May 10
0
Speex echo canceller on TI C55 DSP
Jean-Marc,
Well I finally tracked down the problem. Then I checked my mail and found
that you had fixed it several hours earlier. :(
Build 11387 produces the same result as my modified build 11343. Because of
compiler limitations in the TI tools, I did have to make modifications to
pseudofloat.h (separating return of float values) and nb_celp.c (adding
braces around a variable declaration
2008 Mar 28
1
acoustic echo canceller & noise reduction sample code
Hello?
My name is Hyeonwoo Oh.
I?m developing video conference software using speex library.
Can you give me some sample codes for acoustic echo canceller and noise
reduction?
I tried noise reduction API, but failed.
Normal encode/decode API is working well.
Thank you very much for your good job.
I?m very pleased with speex.
Best regards,
Hyeonwoo Oh
2006 Oct 04
3
Decode win32 encoded files on TI C5x???
I have successfully DECODED speex on TI C5509:
#define TESTENC_BYTES_PER_FRAME 20 /* 8kbps */
#define TESTENC_QUALITY 4 /* 8kbps */
I am trying to generate the files I need with speexenc.exe:
speexenc -n --quality 4 -V male.wav male.spx
But I can't decode the files on C5x.
Yes, I have seen that speexenc.exe adds Ogg header and
2010 Nov 04
1
About Acoustic Echo Canceller
Hello.
I'm from Federal University of Rio Grande do Sul - Brazil and I'm
trying to adapt
speex_echo.h (speex-1.2beta3-win32) to our video-conference software code.
We are working on amplitude values, but I realised that in order to AEC
works, one has to convert amplitude to frequency and filter the echo
frequencies. So, my question is:
Do I have to manually convert amplitude samples to