bandpass.py 文件源码

def initImpulseResponse(self, window):
        if self.bandType == 'allpass':
            self.impulseResponse = windows.kroneckerDelta(self.order+1)

        elif self.bandType == 'allstop':
            self.impulseResponse = np.zeros_like(window)

        elif self.bandType == 'lowpass':
            hightaps = self.high*self.taps
            self.impulseResponse = self.high*np.sinc(hightaps) * window

        elif self.bandType == 'highpass':
            lowtaps = self.low*self.taps
            self.impulseResponse = (-self.low*np.sinc(lowtaps) * window +
                windows.kroneckerDelta(self.order+1))

        elif self.bandType == 'bandpass':
            lowtaps = self.low*self.taps
            hightaps = self.high*self.taps
            self.impulseResponse = (self.high*np.sinc(hightaps) -
                self.low*np.sinc(lowtaps)) * window

        elif self.bandType == 'bandstop':
            lowtaps = self.low*self.taps
            hightaps = self.high*self.taps
            self.impulseResponse = ((self.high*np.sinc(hightaps) -
                self.low*np.sinc(lowtaps)) * window +
                windows.kroneckerDelta(self.order+1))

        else:
            raise Exception('Invalid bandType: ' + str(self.bandType))

        self.impulseResponse = self.impulseResponse.astype(self.dtype, copy=False)