features.py 文件源码

def __init__(self, sample_rate, frame_length):
        ''' 
        Initialize MFCC Calculator.
        @param sample_rate: audio sample rate
        @param input_size: length of magnitude spectrum (half of FFT size assumed)            
        '''
        self.sample_rate = sample_rate
        self.nyquist = sample_rate / 2.0
        self.min_hz = 0
        self.max_hz = self.nyquist
        self.input_size = frame_length / 2
        self.num_bands = 40
        self.window = np.hamming(frame_length)
        self.filter_matrix = None
        return