[Fwd: Re: [PD-dev] I need a formula]

Yves Degoyon ydegoyon at free.fr
Mon Jun 3 18:32:11 CEST 2002


hi,

thanks to Michael & dan... i've got the answer now.

sorry for this real newbie question
but i never studied dsp... should i ??

cheers,

yves

-------- Original Message --------
Subject: Re: [PD-dev] I need a formula
Date: Mon, 3 Jun 2002 10:28:26 -0400 (EDT)
From: Michael Casey <mkc at media.mit.edu>
To: Yves Degoyon <ydegoyon at free.fr>



             Center Frequency      0.5 * (Fmax + Fmin)
Q factor =  -----------------  =   --------------------
                Bandwidth              (Fmax - Fmin)


The Heisenberg uncertainty principle dictates that a high Q filter (narrow
frequency selectivity) will have low temporal resolution and that high
temporal resolution will have low frequency selectivity.

It's always a trade off...

Best regards,

---
Michael Casey, Research Scientist
MERL, 201 Broadway 8th floor Cambridge
MA 02139, USA. tel:+1.617.621.7535
http://www.merl.com/people/casey  http://www.media.mit.edu/~mkc


On Mon, 3 Jun 2002, Yves Degoyon wrote:

> hi,
>
> i'm trying to use a bp~ object so that it can filter
> frequencies betweem Fmin and Fmax.
>
> i think the central frequency should be set to ( Fmin+Fmax )/2,
> but what value should be given to the Q factor ??
>
> thanx.
>
> yves/
>
>
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