| From Koos Herselman
| Fri, 26 Jan 2007 11:13:46 +0200
| Subject: [Audacity-help] Deleting peaks
| I have a vocal track with a loud foreground hiss which coincides with
| the highest peaks of the waveform. Is there a way for me to cut out
| the peaks and only keep those frequencies between 50Hz and
| 5kHz, which is where the voice is?
There isn't a simple one step way to do what you are asking in terms of
frequencies, but if you select all the track and click Effect > High Pass Filter
entering 5000 Hz in the box, this will attenuate (but not eliminate) the
frequencies above 5000 Hz which is likely where the hiss is concentrated.
Running the High Pass Filter again will further attenuate frequencies above
the chosen level, or you can use Effect > Equalization instead. If you drag
the Window out to full screen size you can drag the frequencies 0 - 50 Hz
and above 5000 Hz to the bottom of the scale which will attenuate them by
30 dB, and similarly a second pass will attenuate them further if needed.
Or if you have an area of the track which is just hiss (no voice) you can select
that area and click Effect > Noise Removal. Then click "Get Noise Profile",
select all the track, Effect > Noise Removal again, and this time choose how
much noise you want filtered out using the slider and click "Remove Noise".
If too much voice is removed with the noise, try a lower setting on the Noise
Removal slider, or deamplify (Effect > Amplify) the area of track used for the
Noise Profile and use that deamplified area as a new Noise Profile.
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Tested on: 1/26/2007 6:30:10 PM