53 lines
1.1 KiB
Python
53 lines
1.1 KiB
Python
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import math
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from generate_wavetable import generateWavetable
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WAVETABLE_FILE_NAME = "sigmoid"
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# process expects a waveform from x=[0, 2pi) centered around f(x)=0
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# normalization is handled by the wavetableGenerator
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def sine(phase):
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return math.sin(phase)
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def square(phase):
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sample = 1.0
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if(phase <= math.pi):
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sample = -1
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return sample
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def saw(phase):
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return (phase / math.pi) - 1.0
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def triangle(phase):
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sample = 0.0
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if(phase <= math.pi/2.0):
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sample = phase * 2.0/math.pi
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elif(phase <= 3.0*math.pi/2.0):
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sample = phase * (-2.0/math.pi) + 2.0
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else:
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sample = phase * 2.0/math.pi - 4.0
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return sample
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def sharkFin(phase):
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k = 10.0
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if(phase <= math.pi):
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sample = 2 * (phase/math.pi) ** k - 1.0
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else:
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sample = -2 * (phase/math.pi - 1.0) ** k + 1.0
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return sample
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def sigmoid(phase):
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k = 4
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a = -k * (phase - math.pi)
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sample = 2 / (1 + math.exp(a)) - 1
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return sample
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# pass in the name of your wavtable file and the process function
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def main():
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generateWavetable(WAVETABLE_FILE_NAME, sigmoid)
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if __name__ == "__main__":
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main()
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