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Re: Audacity Question

Subject: Re: Audacity Question
From: Gianni Pavan <>
Date: Mon, 27 Feb 2006 09:44:00 +0100
cutting frequencies below 1kHz is just high-pass filtering at 1kHz.
besides this, real-world filters can't cut everything up to 999Hz and 
leave intact all waves at 1000Hz and up.
any filter has its own "cutting shape" that may affect frequencies 
above your cutting frequency.
but you can approximate the cutting shape you need by trying with 
different tools: in Audition you have a collection of different 
filters and in particular with FFT filter you can accurately set the 
cutting shape you need.
but sharp-cutting is not always the best sounding option. if you need 
to remove ambient rumbles below 1 kHz maybe you'll discover that 
sharp-cutting sounds not-so-natural. Try with more gentle operation instead.
maybe audacity has similar functions.


At 03.26 27/02/2006, you wrote:

>Hi there,
>Does anyone know how to cut off all data below a certain frequency
>threshold? I don't want to use the HighPass Filter, I just want to get
>rid of all the sound below 1kHz...
>Also, if I run the the highpass filter, it doesn't affect things above
>the threshold I give it at all, right?
>Thanks! Natalie :)

Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
Via Taramelli 24, 27100 PAVIA, ITALIA
Tel        +39-0382-987874
Fax        +39-02-700-32921

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