NAudio-Pitchshifter

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NAudio-Pitchshifter

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A realtime C# audio pitch shifter based on S. M. Bernsees phase vocoder that implements an NAudio SampleProvider.

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// repository documentation

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# NAudio-Pitchshifter

A realtime C# audio pitch shifter based on S. M. Bernsees phase vocoder that implements an NAudio ISampleProvider.

Or in simple words: this lets you change the pitch of audio (e.g. in realtime playback using the NAudio library).

UPDATE: contributed the newest version to NAudio, where it is now included from V1.8 on:
https://github.com/naudio/NAudio/blob/master/NAudio/Wave/SampleProviders/SMBPitchShiftingSampleProvider.cs

Test application screenshot:

![Example Screenshot](https://raw.githubusercontent.com/Freefall63/NAudio-Pitchshifter/master/Example.bmp)

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Usage

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Imports NAudio.Wave

// Choose FFTSize and Osamp. (recommended are 4096 and 4)
// Define Pitch shifting factor. (0.5f pitches one octave down, 2f would pitch one octave up)

Sub Test()

SMBPitchShiftingSampleProvider SMB = new SMBPitchShiftingSampleProvider(new AudioFileReader(@"C:\Test.wav"), 4096, 4L, 0.5f);

WaveOutEvent wo = new WaveOutEvent
  {
    DesiredLatency = 150,
    NumberOfBuffers = 3
  };

wo.Init(new SampleToWaveProvider16(SMB));

wo.Play();
  
End Sub

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