Mercurial > hg > python-tutorial-skeleton
diff test_signal_processing.py @ 3:4be70944d21b skeleton_v2
Add some basic signal processing methods we need
author | Chris Cannam |
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date | Thu, 04 Oct 2012 17:14:05 +0100 |
parents | |
children | ea2387fd1b90 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test_signal_processing.py Thu Oct 04 17:14:05 2012 +0100 @@ -0,0 +1,27 @@ + +import signal_processing as sp +import numpy as np + +def test_rms(): + assert sp.rms([1,1,1]) == 1.0 + assert sp.rms([0.5,-0.5]) == 0.5 + assert sp.rms([0,0,0,0]) == 0.0 + assert sp.rms([5]) == 5.0 + assert abs(sp.rms([1,2,-2]) - np.sqrt(3.0)) < 0.000001 + +def test_autocorrelation(): + samples = [1,0,0,1,0,0,1,0,0,1,0,0,1,0,0] + acf = sp.autocorrelation(samples) + assert len(acf) == len(samples) + assert np.argmax(acf) == 0 + assert acf[3] > acf[2] + assert acf[3] > acf[4] + +def test_bpm_lag_conversions(): + assert sp.bpm_to_lag(60, 1) == 1 + assert sp.bpm_to_lag(60, 120) == 120 + assert sp.bpm_to_lag(30, 120) == 240 + assert sp.bpm_to_lag(120, 1) == 0 # should be an integer + assert sp.lag_to_bpm(120, 120) == 60.0 + assert sp.lag_to_bpm(60, 120) == 120.0 + assert sp.lag_to_bpm(80, 6) == 4.5