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Topic: sinewave with a frequency of 440Hz? (Read 619 times) |
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Koenie
  
 
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sinewave with a frequency of 440Hz?
« on: Sep 7th, 2004, 5:56pm » |
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Hello,
I'm kinda stuck with this weird sound problem. I'm trying to play a sinewave at 440 Hz, but I can't figure out what sample-rate to use. I'm using Sonia's LiveOutput with an outputlength of 512. Here is the code I'm using:
Code:int len = 512;
int freq = 440;
float amp = 0.5;
float oneCycle = TWO_PI/len;
void setup(){
size(200, 200);
Sonia.start(this, 10000);
LiveOutput.start(len, len*2);
LiveOutput.startStream();
for (int i = 0; i < len; i++) {
LiveOutput.data[i] = amp * sin(float(i * oneCycle * freq));
}
}
public void stop() {
Sonia.stop();
super.stop();
} |
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I just used a sample-rate of 10000, because I really have no idea what sample-rate to use.
It's probably hard to understand the way I explain it, but all I want is to play a sinewave sound at a frequency of 440 Hz. Can anyone please help me out?
Thanks in advance,
Koenie
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http://koeniedesign.com
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flight404
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Re: sinewave with a frequency of 440Hz?
« Reply #1 on: Sep 7th, 2004, 9:44pm » |
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Hey there Koenie... a similar but not quite thread going on over at 'liveoutput x 2'. I think this will help you out...
http://www.pitaru.com/sonia/examples/LiveOutput_phase/index.html
Hit the source code and see that Amit made a sine wave play at a specific frequency. I think this is what you need......
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Koenie
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Re: sinewave with a frequency of 440Hz?
« Reply #2 on: Sep 8th, 2004, 9:18pm » |
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Thanks a lot, flight404, that was just what I needed. In case you were wondering what I wanted to use it for, I made a mini piano, to help explain a bit of text I'm writing  . It's nothing special, just click and drag the mouse over it.
http://koeniedesign.com/tmp/keyboard/
Koenie
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http://koeniedesign.com
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