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POWhy DFT from AForge.Math doesn't work?
 

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  1. POWhy DFT from AForge.Math doesn't work?
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    <p>I tried to get fft and then get dft of a wave using this code:</p> <pre><code> string s = textBox1.Text; double[] source = SourceToDouble(s); listBox2.DataSource = source; ToPowerOfTwo(ref source); List&lt;Complex&gt; Source = DoubleToComplex(source); Complex[] sou = Source.ToArray(); FourierTransform.FFT(sou, FourierTransform.Direction.Forward); listBox1.DataSource = sou; FourierTransform.DFT(sou, FourierTransform.Direction.Forward); DoPlaySound(sou); </code></pre> <p><code>SourceToDouble(s)</code>:</p> <pre><code>private double[] SourceToDouble(string s) { List&lt;double&gt; Final = new List&lt;double&gt;(); EricOulashin.WAVFile audioFile = new EricOulashin.WAVFile(); String warning = audioFile.Open(s, WAVFile.WAVFileMode.READ); if (warning == "") { short audioSample = 0; for (int sampleNum = 0; sampleNum &lt; audioFile.NumSamples; ++sampleNum) { audioSample = audioFile.GetNextSampleAs16Bit(); Final.Add((double)audioSample); } } else { throw new Exception(warning); } return Final.ToArray(); } </code></pre> <p><code>ToPowerOfTwo(ref source)</code>:</p> <pre><code>private void ToPowerOfTwo(ref double[] source) { List&lt;long&gt; TwoPowers = GetTwoPowers(100); long pCount = 0; for (int i = 0; i &lt;= 100; i++) { if (source.Count() &lt;= TwoPowers[i]) { pCount = TwoPowers[i]; break; } } List&lt;double&gt; f = new List&lt;double&gt;(source); while (f.Count &lt; pCount) { f.Add(0.0); } //f.Add(0.0); source = f.ToArray(); } </code></pre> <p><code>DoubleToComplex(source)</code>:</p> <pre><code>private static List&lt;Complex&gt; DoubleToComplex(double[] source) { List&lt;Complex&gt; Source = new List&lt;Complex&gt;(); foreach (double dob in source) { Complex c = new Complex(dob, 0.0); Source.Add(c); } return Source; } </code></pre> <p><code>DoPlaySound(sou)</code>:</p> <pre><code> private void DoPlaySound(Complex[] c) { FourierTransform.DFT(c, FourierTransform.Direction.Forward); double wav = c[0].Re; List&lt;double&gt; Big = ToBigger(100000, new double[] { wav }); MakeWavFile(Big, "tmp.wav"); System.Media.SoundPlayer s = new SoundPlayer("tmp.wav"); s.PlayLooping(); } </code></pre> <p><strong>the problem is this: when I give a wav file to general code, after a long time the method trying to play the final wav (tmp.wav) but it isn't like the general file.</strong></p> <p><strong>Update 1:</strong></p> <p>I also tried <code>FourierTransform.DFT(sou, FourierTransform.Direction.Backward);</code> but it didn't work too!</p>
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    1. USahmadali shafiee
    1. USahmadali shafiee
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