wave_io.py 文件源码

def __init__(self, path, time_wnd = 25, time_off = 10):
        wave_src = wave.open(path, "rb")
        para_src = wave_src.getparams()
        self.rate = int(para_src[2])
        self.cur_size = 0
        self.tot_size = int(para_src[3])
        # default 400 160
        self.wnd_size = int(self.rate * 0.001 * time_wnd)
        self.wnd_rate = int(self.rate * 0.001 * time_off)
        self.ham = np.hamming(self.wnd_size+1)
    self.ham = np.sqrt(self.ham[0:self.wnd_size])
    self.ham = self.ham / np.sqrt(np.sum(np.square(self.ham[range(0,self.wnd_size, self.wnd_rate)])))
        self.data = np.fromstring(wave_src.readframes(wave_src.getnframes()), dtype=np.int16)
        self.upper_bound = np.max(np.abs(self.data))