[Speex-dev] how to fix high freq noise?

[Jason Hennigar]

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 écrit :
>   
>> 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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>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
>>
>>     
>
>