3 questions

[Pascal Angot]

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Hello,

 

First of all, thanks for your answers with so much precision on the forum. It’s a precious help for beginners as me.

 

I’m using Audacity 1.2.6 on my computer under Windows XP.

 

At present I make copies from K7 conferences (men voices) to CD.

 

I use FFT filter to remove low frequency noises under 100 Hz (as shown on picture close to the text)

 

 

 

1- In order to see the 50 Hz scale, is it possible, through a keyboard command, to expand, to zoom the FFT filter window written by Dominic Mazzoni by another means than pulling several times (approximately 10) the left window edge ?

 

 

2- After having applied the FFT filter to a recording, is-it possible to know the FFT filter setting when later checking the “.aup” music file only ?

 

 

3- Could-you please explain the effect of the 4 choices shown in the 2 windows below for “real time smoothing” and “high quality smoothing” ?

 

 

 

 

Kindly

Pascal

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[Gale (Audacity Team)]

On Tue, 29 Sep 2009 10:18:28 +0200
"Pascal Angot" <[hidden email]> wrote:
> I’m using Audacity 1.2.6 on my computer under Windows XP.

Firstly, thanks for that information, it's always important to
know the Audacity version and operating system.
 
> At present I make copies from K7 conferences (men voices) to CD.
> I use FFT filter to remove low frequency noises under 100 Hz ...
>
> 1- In order to see the 50 Hz scale, is it possible, through a keyboard
> command, to expand, to zoom the FFT filter window written by Dominic
> Mazzoni by another means than pulling several times (approximately 10)
> the left window edge ?

No. But if you use Effect > Equalization instead, the horizontal
scale is logarithmic there as opposed to the linear scale in
FFT filter. So the scale in Equalization allows more space
to the lower frequencies (which are always the loudest) than
the higher ones.  

 
> 2- After having applied the FFT filter to a recording, is-it possible to
> know the FFT filter setting when later checking the “.aup” music file
> only ?

No, the .aup file only stores peak and RMS (average) sound
levels for each of the .au files in the project _data folder.
It does not store the value parameters of effects which
were used to arrive at those levels.

If you use Audacity Beta (currently version 1.3.9), the
FFT effect is now incorporated into Effect > Equalization
and you can switch between linear and logarithmic views.
[This has certain problems in displaying the control
points when switching view, and after the next Stable
2.0 version is released, we may go back to a separate
effect for each type of view, the logarithmic one being    
of the simpler "graphic equaliser" type.]

Also, Equalization in Audacity Beta always remembers
the last applied curve even if you exit and restart, and
can save custom EQ curves as "presets".


> 3- Could-you please explain the effect of the 4 choices shown
> in the 2 windows below for “real time smoothing” and
> “high quality smoothing” ?

I in fact did so in a very recent post to this list:
http://n2.nabble.com/Getting-Noise-When-converting-from-Audio-Cassette-to-MP3-tp3667389p3681670.html

"Smoothing" should be described as "conversion", that is
from a higher to a lower sample size (for example, from
the default Audacity 32-bit float quality to 16-bit when
exporting an audio file.

Also see:
http://audacity.sourceforge.net/onlinehelp-1.2/prefs.htm


Gale

 


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