[music-dsp] More newbie Q: Why don't they do anti alias?
tsietsma at hotmail.com
Wed Jan 30 16:38:23 EST 2002
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. =]
>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
>[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]
>. piter pasma ....
>.. ritz[nd-44-zh] ...
>... ritz_rvl(at)yahoo(dot)com ..
>.... http://www.ritz.nd-44-zh.net .
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