carrier.py 文件源码

def direct(self, sigin):
        """
        apply this filter to a signal
        sigin : input signal (ndarray)
        returns the filtered signal (ndarray)
        """
        fftconvolve = signal.fftconvolve

        filtered = fftconvolve(sigin.ravel(), self.fir, 'same')
        if self.extract_complex:
            filtered_imag = fftconvolve(sigin.ravel(), self.fir_imag, 'same')

        if sigin.ndim == 2:
            filtered = filtered[None, :]
            if self.extract_complex:
                filtered_imag = filtered_imag[None, :]

        if self.extract_complex:
            return filtered, filtered_imag
        else:
            return filtered