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How to use FFT process?
Posted: Thu Aug 21, 2008 5:04 pm
by maison
I want to filter out certain frequencies (say 500 to 1000 hz) from a WAV file signal. I think I need to use the Effects FFT filter. However I do have any instruction (documentation) regarding use of this feature. Please direct me to documentation and/or provide an explanation.
Thank-you very much
Maison
Re: How to use FFT process?
Posted: Thu Aug 21, 2008 5:32 pm
by steve
maison wrote:I want to filter out certain frequencies (say 500 to 1000 hz) from a WAV file signal.
The easiest way is to duplicate the track, then use a 500 Hz low pass filter on one track, and a 1000 Hz High pass filter on the other track. When you Export the audio the two tracks will be mixed together. Alternatively you can Mix the tracks within Audacity ("Quick Mix" in Audacity 1.2.x and "Mix and Render in Audacity 1.3.x).
I think that high pass and low pass filters are included in Audacity 1.3.5. If not, they are available here:
http://audacityteam.org/download/nyquistplugins
If you just want to reduce, rather than remove, the frequencies, use the Equalizer effect.