windowing effect in the spectrum
peak detection method
- method for AM sin wave
- http://www.mathworks.com/products/demos/shipping/dspblks/dspenvdet.html#7
- but for a drum beat, it fails, because the carrier wave is not a narrow band signal
- need to use the neighborhood method, details here http://billauer.co.il/peakdet.html
- noise in the signal can also effect the neighborhood method, so may need to to some threshold.
- peak can be sharp or flat, so
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