shifter.py 文件源码

def f0transform(self, x, completion=False):
        """Transform F0 of given waveform signals using

        Parameters
        ---------
        x : array, shape ('len(x)')
            array of waveform sequence

        completion : bool, optional
        Completion of high frequency range of F0 transformed wavform based on
        unvoiced analysis/synthesis voice of given voice and high-pass filter.
        This is due to loose the high frequency range caused by resampling
        when F0ratio setting to smaller than 1.0.

        Returns
        ---------
        transformed : array, shape (`len(x)`)
            Array of F0 transformed waveform sequence

        """

        self.xlen = len(x)

        # WSOLA
        wsolaed = self.wsola.duration_modification(x)

        # resampling
        transformed = resample(wsolaed, self.xlen)

        # Frequency completion when decrease F0 of wavform
        if completion:
            if self.f0rate > 1.0:
                raise ValueError("Do not enable completion if f0rate > 1.")
            transformed = self._high_frequency_completion(x, transformed)

        return transformed