I want to develop a bass effect for media player.Can any body help me regarding this..
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First step is to isolate the low-frequency components. You will need an FFT to do this... there's one linked to this older S/O question.
After you've got the frequency representation of your audio data, alter the magnitudes of the low-frequency components as you see it, run the inverse transform to convert it back to audio samples, and pass it to the audio hardware for playback.

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Reuben Scratton
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1thanks for reply, how to pass audio samples to audio hardware,can you explain me ? – Ramesh Akula Oct 13 '11 at 04:16
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1The Java API on Android is AudioTrack. See http://developer.android.com/reference/android/media/AudioTrack.html – Reuben Scratton Oct 13 '11 at 09:28