We have obtained a value of system delay by minimizing the integrated squared error between the input signal and the appropriately delayed output signal. Most important, this theoretically obtained value is consistent with previous results and our physical reasoning. The various examples bear this out. The average delay time can also be denormalized for the BP equivalents of the previously discussed signals applied to a BP filter by multiplying by 1/πΔf, where Δf is the BP 3-dB bandwidth in hertz and the LP prototype has unity-radian cutoff frequency. The LP response then corresponds to the envelope of the BP response.