[music-dsp] More newbie Q: Why don't they do anti alias?

[Tjeerd Sietsma]

Hi Piter,

You know a butterworth filter? It 'softens' the waveform and makes it sound 
less 'sharp'. I guess this is what you mean.
But please leave the black and white pixels out of it. =]

Cya

Tjeerd

>From: "piter pasma ..ritz" <ritz_rvl at yahoo.com>
>Reply-To: music-dsp at shoko.calarts.edu
>To: music-dsp at shoko.calarts.edu
>Subject: RE: [music-dsp] More newbie Q: Why don't they do anti alias?
>Date: Wed, 30 Jan 2002 12:46:49 -0800 (PST)
>
>--- "Payan, Remi" <rem at ti.com> wrote:
> >
> > Actually, this is done by oversampling-filtering-decimating.
> > But you always need to worry about band limiting when you're
> > playing with non-contiguous signal.
>
>actually what they do is just calculate the area of 'black'
>and 'white' under a pixel, and use that as a grayscale-tint.
>[or the average between all the colors in a pixel] ..
>
>this works very good for graphics because the eye sees images
>in the spatial domain, while the ear hears sounds in the frequency
>domain.
>[the spatial domain in graphics would be roughly equivalent to
>the temporal domain in soundwaves]
>
>that's why we need complicated frequency-filters to AA with
>sound, while simple averaging-filters are sufficient with gfx.
>
>[ok, i know that i'm a bit wrong, but i'm trying not to be
>too complicated here]
>
>- ritz
>
>
>=====
>. piter pasma                   ....
>.. ritz[nd-44-zh]                ...
>... ritz_rvl(at)yahoo(dot)com     ..
>.... http://www.ritz.nd-44-zh.net  .
>
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