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Topic: synthesizing semitones (Read 386 times) |
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Vair
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synthesizing semitones
« on: Nov 11th, 2004, 10:48pm » |
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Let me begin by saying that what I don't know about music theory can and does fill entire libraries.
For fun, I'm modifying the sine wave example (found here http://pitaru.com/sonia/examples/LiveOutput/index.html ) in order to make it play a tune. I realise that I can play notes by feeding it with integers (from about 3 upwards) and each successive integer will play roughly a semitone higher.
Now what I've been trying to explore is using equal temperament ( http://en.wikipedia.org/wiki/Equal_temperament )
A list of frequencies can be found here http://www.phy.mtu.edu/~suits/notefreqs.html
My guess was that if I change the output length to 1000 (to be one second - a guess), I could feed in the frequencies in the list to get nice sounding notes. And it kind of works - I can hear the semitones going up and it sounds as though it might be right but the problem is that if I use any number with a value after the floating point, the notes produced have a loud rattling sound.
I realise that the most likely cause of the problem is my misunderstanding of the code or the musical theory so I would appreciate insight from those of you who understand both (or one).
The important bit of code here:
float dat = amp* sin(float(i*oneCycle*freq));
(This is in a for loop so i is incremented by 1 from 0 to the output length (1000) and oneCycle is
(TWO_PI) / outputLen;
amp is amplitude (.5) in this case and freq is a frequency from the list linked to earlier.
edit:
I realise that this question could be far more simply put as "how do you synthesize music with sonia?".
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| « Last Edit: Nov 11th, 2004, 11:59pm by Vair » |
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Vair
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Re: synthesizing semitones
« Reply #1 on: Nov 12th, 2004, 4:33am » |
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Well I finally figured out that that's what the next example does so I guess there's no need to reply to my questions.
What is this phase stuff about anyway? Where can I find a good entry level reference for all this?
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