forked from M-Labs/artiq
wavesynth: basic sample computation
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from copy import copy
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from math import cos, pi
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import cairoplot
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class Spline:
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def __init__(self, c):
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self.set_coefficients(c)
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def set_coefficients(self, c):
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self.c = copy(c)
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def next(self):
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r = self.c[0]
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for i in range(len(self.c)-1):
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self.c[i] += self.c[i+1]
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return r
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class SplinePhase:
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def __init__(self, c):
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self.c = [0.0]
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self.set_coefficients(c)
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def clear(self):
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self.c[0] = 0.0
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def set_coefficients(self, c):
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self.c = self.c[0:1] + c[1:]
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self.c0 = self.c[0]
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def next(self):
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r = self.c[0] + self.c0
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for i in range(len(self.c)-1):
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self.c[i] += self.c[i+1] % 1.0
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return r
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class DDS:
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def __init__(self, c_amplitude, c_phase):
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self.amplitude = Spline(c_amplitude)
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self.phase = SplinePhase(c_phase)
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def next(self):
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return self.amplitude.next()*cos(2*pi*self.phase.next())
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class Wave:
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def __init__(self, c_bias, c_dds_amplitude, c_dds_phase):
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self.bias = Spline(c_bias)
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self.dds = DDS(c_dds_amplitude, c_dds_phase)
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def next(self):
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return self.bias.next() + self.dds.next()
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if __name__ == "__main__":
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w = Wave([0.0, 0.0, 0.0], [0.0, 0.0, 0.01], [0.0, 0.0, 0.0005])
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x = list(range(400))
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y = [w.next() for i in range(100)]
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w.dds.amplitude.c[2] = -0.01
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y += [w.next() for i in range(100)]
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w.dds.amplitude.c[2] = -0.01
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w.dds.phase.c[2] = -0.0005
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y += [w.next() for i in range(100)]
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w.dds.amplitude.c[2] = 0.01
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y += [w.next() for i in range(100)]
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cairoplot.scatter_plot("plot.png", [x, y])
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