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I have a sound file I would like to modify the pitch of. The file is stored in an MP3. I have searched the internet but have been unsuccessful in finding any libraries or algorithms that would allow me to modify the pitch.

Any examples and/or literature would be appreciated

Skylion
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  • I can't find an implementation for a byte[]. The solutions I found were with purely sinusoidal waves which I have no idea how to extract from a byte[] or targetDataLine. – Skylion Sep 08 '13 at 19:00
  • Try searching for soundtouch and java. I am pretty sure there is a java implementation of soundtouch. – Bjorn Roche Sep 08 '13 at 23:09

1 Answers1

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It's not really clear from your question whether you only want to change the playback speed (like the pitch fader on a turntable does) or whether you want to change the pitch without affecting the playback speed. If the latter, you need to use a time stretching/pitch shifting algorithm. See: http://en.wikipedia.org/wiki/Audio_time-scale/pitch_modification

In any case, you'd first have to decode the MP3 into PCM audio. This thread might give you some pointers:

How to get audio data from a MP3?

As for doing pitch shifting in Java, there's some more info here:

Slowing down the playback of an audio file without changing its pitch?

Community
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Erik J
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