def __init__(self, channels=1, sample_width=2, sample_frequency=16000, sample_length=0, wave_bin_data=None):
        self.channels = channels                #声道数
        self.sample_width = sample_width        #采样字节宽度
        self.sample_frequency = sample_frequency#采样频率
        self.sample_length = sample_length      #采样长度点数