%matplotlib inline import matplotlib.pyplot as plt import numpy as np from IPython.html.widgets import interactive from IPython.display import Audio, display import numpy as np def beat_freq(f1=220.0, f2=224.0): max_time = 3 rate = 8000 times = np.linspace(0,max_time,rate*max_time) signal = np.sin(2*np.pi*f1*times) + np.sin(2*np.pi*f2*times) print(f1, f2, abs(f1-f2)) display(Audio(data=signal, rate=rate)) return signal v = interactive(beat_freq, f1=(200.0,300.0), f2=(200.0,300.0)) display(v) v.kwargs f1, f2 = v.children f1.value = 255 f2.value = 260 plt.plot(v.result[0:6000])