Hello!
David!
You are a great person.
I really appreciate your and others help with this.
Thanks.
/Anders.
----- Original Message -----
From: "David R. Sky" <davidsky@xxxxxxxxxxxxxx>
To: <audacity4blind@xxxxxxxxxxxxx>
Sent: Tuesday, June 27, 2006 7:25 AM
Subject: [audacity4blind] Re: Reducing hum with audacity.
Hi Anders,
To remove one specific frequency, don't use the lowpass or highpass filters, use the notch filter I've attached, called notch50.ny - the default frequency it will remove is fifty hertz.
Three edit fields: remove 60hz, remove 50hz, or remove frequency of your choice. Default is remove 50hz.
Next edit field: if you've chosen to remove another frequency, enter it into this field.
Third edit field: what's known as 'q' or 'quality' of filtering. A lower value removes a wider range of frequencies centered around the notch frequency you chose.
David
On Tue, 27 Jun 2006, Anders Holmberg wrote:
Hello!
I am about to reduce hom or try to remove it with audacity.
Its from a radio show which i recorded from my stereo receiver.
I didn't realize there was a grounding problem.
Its a 50HZ hum which is really annoying to listen to.
Can anybody here recomend which filter i should use to reduce this hum?
And which cutoff frequency would be the best to use?
I have tried to use lowpass filter from 40 hz and highpass filter from 70 hz.
But i am no mathematics which now seem to be abit frustrating to me.
I am no good in counting so i hope someone can clear out this for me.
Sorry.
Thanks in advance.
/Anders.
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