Phase intercept distortion in bandpass networks

This letter points out that phase distortion can arise in linear bandpass networks which have linear phase characteristics within the pass-band. In particular, it is shown that even in the case of an ideal bandpass filter having a linear phase response within its passband, signals bandlimited to the filter bandwidth can undergo a distortion upon transmission through such a network if the phase function of the filter does not pass through the zero frequency point of the frequency axis. This type of phase distortion is termed intercept distortion.