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wavesynth: basic sample computation

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Sebastien Bourdeauducq 2015-03-15 16:30:07 +01:00
parent 2b3641ac0a
commit 0d8260af6e
2 changed files with 69 additions and 0 deletions

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