Speex dev - Jun 2010 - Denoise causing drain pipe effect in audio

Hi

I have been developing an audio application using Speex. To reduce the
background noise in the captured audio I have enabled the denoise
feature and set the noise suppression level to 60. Although the
constant background noise is reduced but using denoise introduces a
weird effect in the audio which can be described as 'Drain Pipe'
effect.

Has anyone faced a simiar issue with the denoise. If yes how did u
manage to solve it or reduce this effect.

Thanks,
Gurinder

On 10-06-04 05:16 AM, Gurinder Singh wrote:
> I have been developing an audio application using Speex. To reduce the
> background noise in the captured audio I have enabled the denoise
> feature and set the noise suppression level to 60.
There you go, don't do that. There's a reason that's not the
default. If
increasing that level didn't cause artefacts, I would have set it higher 
by default.

	Jean-Marc
> Although the
> constant background noise is reduced but using denoise introduces a
> weird effect in the audio which can be described as 'Drain Pipe'
> effect.
>
> Has anyone faced a simiar issue with the denoise. If yes how did u
> manage to solve it or reduce this effect.
>
> Thanks,
> Gurinder
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
>
>

Hi Jean

Thanks for the reply.

We expect to use the codec in an environment where we expect very high
background noise where high noise suppression will be needed. In a
situation like a soccer match.

Is there a way of retaining high noise suppression and still getting
better audio quality. Your pointers will be of great help.

Thanks,
Gurinder

On 6/4/10, Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>
wrote:
> On 10-06-04 05:16 AM, Gurinder Singh wrote:
>> I have been developing an audio application using Speex. To reduce the
>> background noise in the captured audio I have enabled the denoise
>> feature and set the noise suppression level to 60.
>
> There you go, don't do that. There's a reason that's not the
default. If
> increasing that level didn't cause artefacts, I would have set it
higher
> by default.
>
> 	Jean-Marc
>
>> Although the
>> constant background noise is reduced but using denoise introduces a
>> weird effect in the audio which can be described as 'Drain
Pipe'
>> effect.
>>
>> Has anyone faced a simiar issue with the denoise. If yes how did u
>> manage to solve it or reduce this effect.
>>
>> Thanks,
>> Gurinder
>> _______________________________________________
>> Speex-dev mailing list
>> Speex-dev at xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
>>
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
>

On 06/04/2010 07:37 PM, Jean-Marc Valin wrote:
> On 10-06-04 05:16 AM, Gurinder Singh wrote:
>    
>> I have been developing an audio application using Speex. To reduce the
>> background noise in the captured audio I have enabled the denoise
>> feature and set the noise suppression level to 60.
>>      
> There you go, don't do that. There's a reason that's not the
default. If
> increasing that level didn't cause artefacts, I would have set it
higher
> by default.
>
> 	Jean-Marc
>
>    
>> Although the
>> constant background noise is reduced but using denoise introduces a
>> weird effect in the audio which can be described as 'Drain
Pipe'
>> effect.
>>
>> Has anyone faced a simiar issue with the denoise. If yes how did u
>> manage to solve it or reduce this effect.
>>
>> Thanks,
>> Gurinder
>>      
I've never heard a single mic denoiser that doesn't sound best in the 
"off" position. :-)

Steve