notes

20210219114633-digital_audio_processing.org

@@ -1 +1,24 @@
 #+title: Digital Audio Processing
+* Sine Wave
+#+name: sine-wave
+#+begin_src python :exports code :results silent
+  import numpy as np
+
+  samplerate = 44100
+  frequency = 440
+  samples = 44100
+
+  x = np.arange(samples)
+  return 100 * np.sin(2 * np.pi * frequency * x / samplerate)
+#+end_src
+
+#+begin_src python :exports results :results file :noweb yes
+  from matplotlib import pyplot as plt
+
+  def wave():
+      <<sine-wave>>
+
+  plt.plot(wave()[:100])
+  plt.savefig("dap-sinewave.png")
+  return "dap-sinewave.png"
+#+end_src