Plot sound wave

import numpy as npimport waveimport pylab as pl

# open wav filef = wave.open(r"F:\Data\ESC-50-wav-files\audio\1-12653-A-15.wav", "rb")

# read format info# (nchannels, sampwidth, framerate, nframes, comptype, compname)params = f.getparams()nchannels, sampwidth, framerate, nframes = params[:4]

>>> print(nchannels)1>>> print(sampwidth)2>>> print(framerate)44100>>> print(nframes)220500

str_data = f.readframes(nframes)f.close()

wave_data = np.fromstring(str_data, dtype=np.short)

time = np.arange(0, nframes) * (1.0 / framerate)

>>> print(time)[  0.00000000e+00   2.26757370e-05   4.53514739e-05 ...,   4.99993197e+00   4.99995465e+00   4.99997732e+00]

>>> pl.plot(time, wave_data)[<matplotlib.lines.Line2D object at 0x0000000007BFDBA8>]>>> pl.xlabel("time (seconds)")<matplotlib.text.Text object at 0x0000000007BA7B70>>>> pl.show()