Apple-2-SW/ii-sound
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Simulate at clock speed and downsample output

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kris 2022-06-28 22:09:42 +01:00
parent 9a9434e9aa
commit c33e835f7a
1 changed files with 15 additions and 7 deletions
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22
waveform.py
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@ -1,5 +1,6 @@
import math import math
import random import librosa
import numpy
import soundfile as sf import soundfile as sf
@ -20,9 +21,9 @@ def params(freq, damping, dt):
return c1, c2, b1, b2 return c1, c2, b1, b2
def wave(count: int): def wave(count: int, sample_rate):
freq = 3875 freq = 3875
dt = 1 / 44100. dt = 1 / sample_rate
damping = -1210 # -0.015167 damping = -1210 # -0.015167
c1, c2, b1, b2 = params(freq, damping, dt) c1, c2, b1, b2 = params(freq, damping, dt)
@ -41,14 +42,15 @@ def wave(count: int):
# scale = 500 * math.sqrt(d * d+ w * w) * math.exp(-d * tm) / (dt * 2000) # scale = 500 * math.sqrt(d * d+ w * w) * math.exp(-d * tm) / (dt * 2000)
x1 = 1.0 x1 = 1.0
th = 44100 th = 23 # sample_rate // 10
switch = th switch = th
scale = 3 # TODO: analytic expression scale = 650 # TODO: analytic expression
maxy = 0 maxy = 0
for i in range(count): for i in range(count):
# y = (c1 * y1 - c2 * y2 + b1 * x1 + b2 * x2) + mult2 * ( # y = (c1 * y1 - c2 * y2 + b1 * x1 + b2 * x2) + mult2 * (
# 1 - cc1 * y1 + cc2 * y2 - bb1 * x1 - bb2 * x2) # 1 - cc1 * y1 + cc2 * y2 - bb1 * x1 - bb2 * x2)
y = (c1 * y1 - c2 * y2 + b1 * x1 + b2 * x2) y = (c1 * y1 - c2 * y2 + b1 * x1 + b2 * x2)
# print(i, y / scale, x1)
x2 = x1 x2 = x1
if i >= switch: if i >= switch:
x1 = -x1 x1 = -x1
@ -63,8 +65,14 @@ def wave(count: int):
def main(): def main():
# print(list(wave(1020400))) # print(list(wave(1020400)))
with sf.SoundFile("out.wav", "w", samplerate=44100, channels=1) as f: sample_rate = 1015657
f.write(list(wave(441000))) output = numpy.array(list(wave(1015657, sample_rate)), dtype=numpy.float32)
output_rate = 96000 # int(sample_rate / 4)
output = librosa.resample(output, orig_sr=sample_rate,
target_sr=output_rate)
with sf.SoundFile("out.wav", "w", samplerate=96000, channels=1) as f:
f.write(output)
if __name__ == "__main__": if __name__ == "__main__":