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POWriting musical notes to a wav file
 

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  1. POWriting musical notes to a wav file
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    <p>I am interested in how to take musical notes (e.g A, B, C#, etc) or chords (multiple notes at the same time) and write them to a wav file.</p> <p>From what I understand, each note has a specific frequency associated with it (for perfect pitch) - for example A4 (the A above middle C) is 440 Hz (complete list 2/3 of the way down <a href="http://www.dolmetsch.com/musictheory1.htm">This Page</a>). </p> <p>If my understanding is correct, this pitch is in the frequency domain, and so needs the inverse fast fourier transform applying to it to generate the time-domain equivalent?</p> <p>What I want to know is:</p> <ul> <li>How do chords work? Are they the average of the pitches?</li> <li>How is the length of time to play each note specified, when the contents of the wav file is a waveform?</li> <li>how is the result of multiple notes being inverse FFT'd converted to an array of bytes, which make up the data in a wav file?</li> <li>any other relevant information relating to this.</li> </ul> <p>Thanks for any help you can give. If giving code examples, I am using C# and the code I am currently using to create wav files is as follows:</p> <pre><code>int channels = 1; int bitsPerSample = 8; //WaveFile is custom class to create a wav file. WaveFile file = new WaveFile(channels, bitsPerSample, 11025); int seconds = 60; int samples = 11025 * seconds; //Create x seconds of audio // Sound Data Size = Number Of Channels * Bits Per Sample * Samples byte[] data = new byte[channels * bitsPerSample/8 * samples]; //Creates a Constant Sound for(int i = 0; i &lt; data.Length; i++) { data[i] = (byte)(256 * Math.Sin(i)); } file.SetData(data, samples); </code></pre> <p>This creates (somehow) a constant sound - but I don't understand completely how the code correlates with the result.</p>
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    1. USOscar Mederos
    1. USsimonalexander2005
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    1. COP.S, I understand this is going to be a non-trivial answer, so even a link to somewhere explaining this would be helpful.
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      1. USsimonalexander2005
    2. COYou might find something here http://www.sonicspot.com/guide/wavefiles.html
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      1. USSaif Khan
    3. COStart with sox. Then if you feel the need to "roll your own", you have a good known baseline.
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      1. USThrowback1986
 

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