mirror of
https://github.com/ivabus/speakersafetyd
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46 lines
919 B
Python
46 lines
919 B
Python
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#!/usr/bin/python
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import scipy, sys
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import numpy as np
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ch = int(sys.argv[1])
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out = sys.argv[2]
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FS = 48000
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PILOT_DB = -30
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PILOT_FREQ = 43
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TEST0 = (500, 1, -10)
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TEST1 = (500, 10, -15)
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TEST2 = (43, 1.5, -6)
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TEST3 = (1000, 1.5, -6)
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def db(x):
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return 10 ** (x / 20)
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def silence(t):
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return np.zeros(int(FS * t))
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def sine(f, t, v):
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space = np.linspace(0, t, int(FS * t), endpoint=False)
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return np.sin(2 * np.pi * f * space) * db(v)
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signal = np.concatenate((
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silence(3),
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sine(*TEST0),
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silence(2),
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sine(*TEST1),
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silence(2),
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sine(*TEST2),
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silence(2),
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sine(*TEST3),
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silence(5)
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))
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space = np.linspace(0, len(signal) / FS, len(signal), endpoint=False)
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signal += np.sin(2 * np.pi * PILOT_FREQ * space) * db(PILOT_DB)
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signal = np.concatenate((silence(60), signal))
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signal = np.repeat(signal, ch).reshape((-1, ch))
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scipy.io.wavfile.write(out, FS, signal.astype("float32"))
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