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1
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2 # To the extent possible under law, Chris Cannam and QMUL have waived
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3 # all copyright and related or neighboring rights to this file
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4 # (http://creativecommons.org/about/cc0)
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5
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6 import signal_processing as sp
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7 import numpy as np
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8
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9 def test_rms():
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10 assert sp.rms([1,1,1]) == 1.0
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11 assert sp.rms([0.5,-0.5]) == 0.5
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12 assert sp.rms([0,0,0,0]) == 0.0
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13 assert sp.rms([5]) == 5.0
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14 assert abs(sp.rms([1,2,-2]) - np.sqrt(3.0)) < 0.000001
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15
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16 def test_autocorrelation():
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17 samples = [1,0,0,1,0,0,1,0,0,1,0,0,1,0,0]
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18 acf = sp.autocorrelation(samples)
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19 assert len(acf) == len(samples)
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20 assert np.argmax(acf) == 0
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21 assert acf[3] > acf[2]
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22 assert acf[3] > acf[4]
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23
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24 def test_bpm_lag_conversions():
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25 assert sp.bpm_to_lag(60, 1) == 1
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26 assert sp.bpm_to_lag(60, 120) == 120
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27 assert sp.bpm_to_lag(30, 120) == 240
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28 assert sp.bpm_to_lag(120, 1) == 0 # should be an integer
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29 assert sp.lag_to_bpm(120, 120) == 60.0
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30 assert sp.lag_to_bpm(60, 120) == 120.0
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31 assert sp.lag_to_bpm(80, 6) == 4.5
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