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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
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</pre>
</blockquote>
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</pre>
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