Running pitch detection on mobile
Name
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Methods
• Zero Crossing• AutoCorrelation• HPS ...
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Stack Overflow Suggests
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• FFT and phase shift
What works..
• Window the input signal• Run FFT• Calculate phase shift• Get Peaks• Store the results for a duration• Volume decibel as an indicator for
voiced and unvoiced sound.
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Steps
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Methods
• Limited FFT Range• Noise• Accuracy• Realtime Feedback
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Problems
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FFT
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What is it?
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FFT Bin ~ 43Hz
Fundamental Frequency
Phase OverlapWhy?
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Performance Tips
• Accelerator library• NSThread
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How fast?
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Questions
• <TODO>•
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Did it fly?
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