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Running pitch detection on mobile
Name
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Methods
• Zero Crossing• AutoCorrelation• HPS ...
2
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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![Untitled-3 [content.alfred.com] · 2017-10-03 · LESSON I Pitch 2 Pitch 3 Pitch 4 Pitch 5 Pitch 6 Pitch 7 Pitch 8 Pitch 10 Pit h 11 Pitch 12 Pitch 13 Pitch 14 Pitch 15 Pitch 16 Pitch](https://img.pdfslide.net/doc/110x75/5f1f182654507e355339a7ee/untitled-3-2017-10-03-lesson-i-pitch-2-pitch-3-pitch-4-pitch-5-pitch-6-pitch.jpg)
