1 load wavefile之后 进行归一化
import scipy.io.wavfile as wav
Fs, data = wav.read(inputAudioFile)
# data = np.double(data) / 32768.0 # makes data vary from -1 to 1
scaleData = 1.2 * data.max() # to rescale the data.
data = np.double(data) / scaleData # makes data vary from -1 to 1
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2. hanming window
def sinebell(lengthWindow):
"""
window = sinebell(lengthWindow)
Computes a "sinebell" window function of length L=lengthWindow
The formula is:
window(t) = sin(pi * t / L), t = 0..L-1
"""
window = np.sin((np.pi * (np.arange(lengthWindow))) / (1.0 * lengthWindow))
return window
"sinebell" window with win_len=2048
