Comments on: Dynamic Sound – Part 1 http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1 Technology and interactive media Fri, 20 Aug 2010 22:47:38 -0700 http://wordpress.org/?v=2.8.6 hourly 1 By: ina http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-1052 ina Fri, 20 Aug 2010 22:47:38 +0000 http://blog.andreanaya.com/?p=303#comment-1052 this might help on using power^n to shift notes - http://www.phy.mtu.edu/~suits/NoteFreqCalcs.html a = 2^(n/12) which means there are "12 half steps" between octaves. (example, you will count 12 white and black keys between middle C and high C, etc) this might help on using power^n to shift notes – http://www.phy.mtu.edu/~suits/NoteFreqCalcs.html

a = 2^(n/12) which means there are “12 half steps” between octaves. (example, you will count 12 white and black keys between middle C and high C, etc)

]]> By: psybermoon http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-487 psybermoon Mon, 02 Nov 2009 16:53:16 +0000 http://blog.andreanaya.com/?p=303#comment-487 script work nice on my machine, thanx a lot greetings form germany script work nice on my machine, thanx a lot
greetings form germany

]]> By: lostchild http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-365 lostchild Thu, 09 Jul 2009 02:34:22 +0000 http://blog.andreanaya.com/?p=303#comment-365 Very nice tutorial... :) Very nice tutorial… :)

]]> By: jonah http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-349 jonah Fri, 12 Jun 2009 15:48:37 +0000 http://blog.andreanaya.com/?p=303#comment-349 Great tutorial. Exactly what I was looking for. Thanks! Great tutorial. Exactly what I was looking for. Thanks!

]]> By: bechar http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-346 bechar Thu, 04 Jun 2009 09:31:51 +0000 http://blog.andreanaya.com/?p=303#comment-346 good one... good one…

]]> By: Obi http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-329 Obi Sun, 10 May 2009 18:34:53 +0000 http://blog.andreanaya.com/?p=303#comment-329 Ok, very interesting. thank you! Ok, very interesting. thank you!

]]> By: admin http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-327 admin Fri, 08 May 2009 14:34:52 +0000 http://blog.andreanaya.com/?p=303#comment-327 This is a formula to get the phaseStep of different notes. Every musical note is part of an Octave and every octave is compound by 12 semi tunes (A, A#, B, C, C#, D, D#, E, F, F#, G and G#). Check this reference <a href="http://www.phy.mtu.edu/~suits/notefreqs.html" rel="nofollow">Frequencies of Musical Notes</a> Each row represent a semi tune frequency. When you set the base frenquency as 110.00 Hz, it means that the fisrt octave is 2 and the first semiTune will be an A, so if you passe octave = 0 and semiTune = 0, you will get an A2. If you pass octave = 2 and semiTune = 4, you will get a C4 because it is 2 octaves above and 4 semi tunes above A2. If you change the base frequency, every note will follow it. For instance, if you set the base frequency as 261.63 the first octave will be 4 and the first semi tune will be C, you will get a middle C4: phaseStep = 261.63*Math.pow( 2, octave + semiTone / 12 )/44100; phaseStep = 261.63*Math.pow( 2, 0 + 0 / 12 )/44100; //C4 phaseStep = 261.63*Math.pow( 2, 0 + 1 / 12 )/44100; //C#4 phaseStep = 261.63*Math.pow( 2, 0 + 2 / 12 )/44100; //D4 phaseStep = 261.63*Math.pow( 2, 1 + 0 / 12 )/44100; //C5 phaseStep = 261.63*Math.pow( 2, 1 + 0 / 12 )/44100; //C6 I don't know the logic behind this formula, but I know that it works ;) Hope this is more clear to you. Thanks for the comment This is a formula to get the phaseStep of different notes. Every musical note is part of an Octave and every octave is compound by 12 semi tunes (A, A#, B, C, C#, D, D#, E, F, F#, G and G#).

Check this reference
Frequencies of Musical Notes

Each row represent a semi tune frequency. When you set the base frenquency as 110.00 Hz, it means that the fisrt octave is 2 and the first semiTune will be an A, so if you passe octave = 0 and semiTune = 0, you will get an A2. If you pass octave = 2 and semiTune = 4, you will get a C4 because it is 2 octaves above and 4 semi tunes above A2.

If you change the base frequency, every note will follow it. For instance, if you set the base frequency as 261.63 the first octave will be 4 and the first semi tune will be C, you will get a middle C4:

phaseStep = 261.63*Math.pow( 2, octave + semiTone / 12 )/44100;

phaseStep = 261.63*Math.pow( 2, 0 + 0 / 12 )/44100; //C4
phaseStep = 261.63*Math.pow( 2, 0 + 1 / 12 )/44100; //C#4
phaseStep = 261.63*Math.pow( 2, 0 + 2 / 12 )/44100; //D4
phaseStep = 261.63*Math.pow( 2, 1 + 0 / 12 )/44100; //C5
phaseStep = 261.63*Math.pow( 2, 1 + 0 / 12 )/44100; //C6

I don’t know the logic behind this formula, but I know that it works ;)

Hope this is more clear to you.
Thanks for the comment

]]> By: Obi http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-326 Obi Fri, 08 May 2009 12:07:32 +0000 http://blog.andreanaya.com/?p=303#comment-326 But please could you explain one more thing: phaseStep = 110.0*Math.pow( 2, octave + semiTone / 12 )/44100; would be nice, thanks. But please could you explain one more thing:
phaseStep = 110.0*Math.pow( 2, octave + semiTone / 12 )/44100;
would be nice, thanks.

]]> By: Obi http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-325 Obi Fri, 08 May 2009 11:50:04 +0000 http://blog.andreanaya.com/?p=303#comment-325 great post, now i think i understand. thanks very much! great post, now i think i understand. thanks very much!

]]> By: FabioTNT http://blog.andreanaya.com/lang/en/2009/04/dynamic-sound-part-1/comment-page-1/#comment-322 FabioTNT Thu, 30 Apr 2009 23:09:35 +0000 http://blog.andreanaya.com/?p=303#comment-322 Wow man, awesome post. congrats!! []s! Wow man, awesome post. congrats!!
[]s!

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