Add python script to plot audio sample data.

examples/device/audio_test/src/plot_audio_samples.py

@@ -0,0 +1,24 @@
+import sounddevice as sd
+import matplotlib.pyplot as plt
+import numpy as np
+
+if __name__ == '__main__':
+
+  #  devList = sd.query_devices()
+  #  print(devList)
+
+    fs = 48000  # Sample rate
+    duration = 100e-3                     # Duration of recording
+    device = 'Microphone (MicNode) MME'   # MME is needed since there are more than one MicNode device APIs (at least in Windows)
+
+    myrecording = sd.rec(int(duration * fs), samplerate=fs, channels=1, dtype='int16', device=device)
+    print('Waiting...')
+    sd.wait()  # Wait until recording is finished
+    print('Done!')
+
+    time = np.arange(0, duration, 1 / fs)  # time vector
+    plt.plot(time, myrecording)
+    plt.xlabel('Time [s]')
+    plt.ylabel('Amplitude')
+    plt.title('MicNode')
+    plt.show()