Hi Masakazu, I have reproduced the Speex high frequency noise issue on a Blackfin 537 by sending 'silence' into the Speex fixed point encoder. By recording the Speex decoder output and plotting the spectrum using Audacity the following two frequencies. 1596Hz at -31.3dB 3200Hz at -48dB These two frequencies are present in both Narrow Band and Wide Band modes. I've tried a number of different configurations and these two frequencies are always present (quality set to 10 or default, the complexity set to default, perceptual enhancement turned on or off). I have not determined how to correct this problem but wanted to provide additional information. Cheers! Jason
What version did you use. Some older releases had encoder-side issues with some times, but that should be fixed now. Jean-Marc Jason Hennigar a ?crit :> Hi Masakazu, > > I have reproduced the Speex high frequency noise issue on a Blackfin 537 > by sending 'silence' into the Speex fixed point encoder. By recording > the Speex decoder output and plotting the spectrum using Audacity the > following two frequencies. > > 1596Hz at -31.3dB > 3200Hz at -48dB > > These two frequencies are present in both Narrow Band and Wide Band > modes. I've tried a number of different configurations and these two > frequencies are always present (quality set to 10 or default, the > complexity set to default, perceptual enhancement turned on or off). I > have not determined how to correct this problem but wanted to provide > additional information. > > Cheers! > Jason > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev > >
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Jean-Marc,<br>
<br>
Thanks for the quick response! The following three version have been
tried and all of them have the high frequency tones.<br>
<br>
speex-svn-14525<br>
speex-1.2rc<br>
speex-svn-15540<br>
<br>
I've isolated this down to the Speex encode/decode by sending silence
(i.e. all zeros) to the encoder and displaying the decoder output in
addition to recording the audio. The ALSA functionality that I am using
to receive and transmit audio is not introducing the problem as it
works correctly when I remove Speex. The problem occurs both on the
Blackfin 537 Stamp board with the AD1836 audio daughter card and with
our own 537 hardware.<br>
<br>
The build configuration settings that I am using are as follows:<br>
--without-ogg<br>
--without-ogg-libraries<br>
--without-ogg-includes<br>
--disable-oggtest<br>
--enable-blackfin-asm<br>
--enable-fixed-point<br>
--disable-float-api<br>
--disable-vbr<br>
<br>
Cheers!<br>
Jason<br>
<br>
Jean-Marc Valin wrote:
<blockquote cite="mid:49658140.7070603@usherbrooke.ca"
type="cite">
<pre wrap="">What version did you use. Some older releases had
encoder-side issues
with some times, but that should be fixed now.
        Jean-Marc
Jason Hennigar a écrit :
</pre>
<blockquote type="cite">
<pre wrap="">Hi Masakazu,
I have reproduced the Speex high frequency noise issue on a Blackfin 537
by sending 'silence' into the Speex fixed point encoder. By recording
the Speex decoder output and plotting the spectrum using Audacity the
following two frequencies.
1596Hz at -31.3dB
3200Hz at -48dB
These two frequencies are present in both Narrow Band and Wide Band
modes. I've tried a number of different configurations and these two
frequencies are always present (quality set to 10 or default, the
complexity set to default, perceptual enhancement turned on or off). I
have not determined how to correct this problem but wanted to provide
additional information.
Cheers!
Jason
_______________________________________________
Speex-dev mailing list
<a class="moz-txt-link-abbreviated"
href="mailto:Speex-dev@xiph.org">Speex-dev@xiph.org</a>
<a class="moz-txt-link-freetext"
href="http://lists.xiph.org/mailman/listinfo/speex-dev">http://lists.xiph.org/mailman/listinfo/speex-dev</a>
</pre>
</blockquote>
<pre wrap=""><!---->
</pre>
</blockquote>
</body>
</html>
Hi Jean-Marc,
Thanks for the quick response! I am resending this mail hopefully in
plain text.
The following three version have been tried and all of them have the
high frequency tones.
speex-svn-14525
speex-1.2rc
speex-svn-15540
I've isolated this down to the Speex encode/decode by sending silence
(i.e. all zeros) to the encoder and displaying the decoder output in
addition to recording the audio. The ALSA functionality that I am using
to receive and transmit audio is not introducing the problem as it works
correctly when I remove Speex. The problem occurs both on the Blackfin
537 Stamp board with the AD1836 audio daughter card and with our own 537
hardware.
The build configuration settings that I am using are as follows:
--without-ogg
--without-ogg-libraries
--without-ogg-includes
--disable-oggtest
--enable-blackfin-asm
--enable-fixed-point
--disable-float-api
--disable-vbr
Cheers!
Jason
Jean-Marc Valin wrote:> What version did you use. Some older releases had encoder-side issues
> with some times, but that should be fixed now.
>
> Jean-Marc
>
> Jason Hennigar a ?crit :
>
>> Hi Masakazu,
>>
>> I have reproduced the Speex high frequency noise issue on a Blackfin
537
>> by sending 'silence' into the Speex fixed point encoder. By
recording
>> the Speex decoder output and plotting the spectrum using Audacity the
>> following two frequencies.
>>
>> 1596Hz at -31.3dB
>> 3200Hz at -48dB
>>
>> These two frequencies are present in both Narrow Band and Wide Band
>> modes. I've tried a number of different configurations and these
two
>> frequencies are always present (quality set to 10 or default, the
>> complexity set to default, perceptual enhancement turned on or off). I
>> have not determined how to correct this problem but wanted to provide
>> additional information.
>>
>> Cheers!
>> Jason
>> _______________________________________________
>> Speex-dev mailing list
>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
>>
>>
>
>
Maybe Matching Threads
- how to fix high freq noise?
- Re: Problem with Blackfin assembly optimizations -- bug in fixed_bfin.h / resampler saturation???
- Problem with Blackfin assembly optimizations -- bug in fixed_bfin.h / resampler saturation???
- Does VBR work for speex in non-float platform now?
- SIP registration