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@bluenote10
Created December 7, 2020 08:37
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ssqueezepy oscilattions
import numpy as np
import matplotlib.pyplot as plt
from ssqueezepy import ssq_cwt, cwt
SAMPLE_RATE = 44100
def sine(freq, num_samples=SAMPLE_RATE // 4, amp=1.0):
ts = np.arange(num_samples) / SAMPLE_RATE
wave = amp * np.sin(2.0 * np.pi * freq * ts)
return wave
def mix(*waves):
return np.array(waves).sum(axis=0) / len(waves)
def plot(Tx, ax):
xs = np.arange(Tx.shape[1] + 1)
ys = np.arange(Tx.shape[0] + 1)
img = ax.pcolormesh(xs, ys, np.abs(Tx))
def plot_ssq(wave, ax):
kw = dict(nv=32, wavelet=('morlet', {'mu': 4.0}))
Tx, *_ = ssq_cwt(wave, fs=SAMPLE_RATE, **kw)
plot(Tx, ax)
if __name__ == "__main__":
fig, axes = plt.subplots(1, 3, figsize=(18, 6))
plot_ssq(sine(440.0), axes[0])
plot_ssq(sine(880.0), axes[1])
plot_ssq(mix(sine(440.0), sine(880.0)), axes[2])
fig.tight_layout()
plt.savefig("/tmp/osci.png")
plt.show()
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