AudioProcessing.py 文件源码

def frame_blocking(signal, framerate, sampletime=0.025, overlap=0.5):
            """
            ??

                ?N???????????????????????N???256?512???????
            ?20~30ms??
            :param framerate:???
            :param signal:????
            :param sampletime:??????
            :param overlap:????????????
            :return: ????????
            """
            samplenum = len(signal)  # ??????
            framesize = int(framerate * sampletime)  # ?????
            step = int(framesize * overlap)  # ?????
            framenum = 1 + math.ceil((samplenum - framesize) / step)  # ??????
            padnum = (framenum - 1) * step + framesize
            zeros = np.zeros((padnum - samplenum,))
            padsignal = np.concatenate((signal, zeros))

            indices = np.tile(np.arange(0, framesize), (framenum, 1)) + np.tile(np.arange(0, framenum * step, step),
                                                                                (framesize, 1)).T
            indices = np.array(indices, dtype=np.int32)
            frames = padsignal[indices]
            return frames