Subject: RE: [stella] music compression From: "Pension Maricel" <Maricel@xxxxxxxxxx> Date: Mon, 5 Apr 1999 17:38:50 +0200 |
SEE OUR WEB PAGE Pension Maricel C. Tacó nº 13 Sitges 08870 España Tel. 938-943-627 Fax 938-943-869 HTTP://WWW.MILISA.COM Maricel@xxxxxxxxxx -----Mensaje original----- De: Chris Wilkson <ecwilkso@xxxxxxx> Para: stella maillist <stella@xxxxxxxxxxx> Fecha: sábado 3 de abril de 1999 2:57 Asunto: Re: [stella] music compression >> Hi all, here's my lastest puzzle: I'm working on a four channel music >> engine, and I'm trying to work out some of the internal memory management > >Andrew, > >Have you considered creating your own waveforms? This allows you to use any >frequency you want. If you only update the sound registers once per line, >you get 0 to 15.7kHz, or 8 (resonable) octaves. If you update every other >scanline, you get a top end of 7.85kHz...still not bad. > >Also, let's assume that no voice ever jumps more than an octave. If you >use relative motion, with chromatic scales, you need 3.5 bits of storage >for each voice, and you give each voice a total range of 4 octaves >(conservative 2-scanline approach). Also, since (I assume) you're doing >2 voices per channel, if you're just re-writing the volume data for each >channel, you can store the information in terms of channels instead of >voices. Doing this gives double the storage resolution, or 1.75 bits >per voice, per beat. > >This all assumes infinite clock cycles with which to work. :) Right now, >I'm way too tired to do the math and get the *real* numbers. But it might >give you a different way of thinking about the problem. > >"So why didn't he try to give feedback before my engine was locked >in place!???" - Andrew > >Ok, I have to go watch TV. But I'll think more on this and get back to you. > >-Chris > > > >-- >Archives (includes files) at http://www.biglist.com/lists/stella/archives/ >Unsub & more at http://www.biglist.com/lists/stella/ > -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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