[PYTHON] Try using scipy

I decided to move from octave to scipy / numpy / matplotlib.

Octave isn't bad either, but the integration with the GUI was too weak ...

For the time being, [this site](http://kaiseki-web.lhd.nifs.ac.jp/wiki/index.php/Python_%E3%81%AB%E3%82%88%E3%82%8B%E3 % 82% AA% E3% 83% BC% E3% 83% 87% E3% 82% A3% E3% 82% AA% E5% 87% A6% E7% 90% 86 "This site") as a reference spectrogram I tried to display.

`spectrogram.py`


#!/usr/bin/env python

import sys
import wave
import urllib2
import scipy as sp
import matplotlib.pyplot as plt

if __name__ == "__main__":
    if len(  sys.argv ) > 1:
        wo  = wave.open( sys.argv[1], 'rb' )
    else:
        url = 'http://www.it.ice.uec.ac.jp/SRV-DB/archive/HENSHU00_PF00/HENSHU00_PF00_0951.wav'
        wo = wave.openfp( urllib2.urlopen( url ).fp, 'rb' )

    chunk = 65536
    data = sp.fromstring( wo.readframes( chunk ), sp.int16 )
    srate = wo.getframerate()
    nFFT = 1024
    window = sp.hamming(nFFT)

    Pxx, freq, bins, im = plt.specgram(
            data,
            NFFT=nFFT,
            Fs=srate,
            noverlap=512,
            window=window)

    plt.show()

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