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Does noise reduction work well if...

DSP, Plug-in and Host development discussion.

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KVRAF
 
4427 posts since 16 Feb, 2005

Postby camsr; Mon Jun 09, 2014 8:48 am Does noise reduction work well if...

The sample in question is converted to a 32-bit float, scaled to a much lower amplitude, like -200dbFS (knowing floats DR), and reduction applied. Or is there a proper 'gain staging' for it? Is the FFT just as accurate that low?
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KVRAF
 
4080 posts since 11 Feb, 2006, from Helsinki, Finland
 

Postby mystran; Mon Jun 09, 2014 10:26 am Re: Does noise reduction work well if...

camsr wrote:The sample in question is converted to a 32-bit float, scaled to a much lower amplitude, like -200dbFS (knowing floats DR), and reduction applied. Or is there a proper 'gain staging' for it? Is the FFT just as accurate that low?


It seems a bit silly to gainstage like that, but as long as you don't go low enough to run into denormals, it shouldn't really matter.
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KVRian
 
848 posts since 17 Apr, 2005
 

Postby JCJR; Tue Jun 10, 2014 9:11 am Re: Does noise reduction work well if...

Tis been awhile since I used a spectral noise reduction. Don't offhand recall the settings params, and certainly haven't used every spectral NR implementation.

Maybe there could be practical problems with real world programs, such that the programmer never imagined that his process would be used on such low level signals? And therefore perhaps the user interface settings would have too limited a settings range to operate properly?

Ferinstance, recall a spectral plug from long ago that was written to be an "automatic" NR kinda like a spectral burwen. No noise print, just a threshold knob and a few other controls. Betcha that one wasn't set up properly to work on -200 dB signals.

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