Determine whether each statement is true or false, a) b) c) d) Ideal filters can't be built but only just approximated. Discrete-time filters have advantages over CT filters. All the ideas that apply to CT filtering and modulation systems apply in a similar way to DT filtering and modulation systems. Spectral analysis of signals can't reveal information that is difficult to detect using time-domain methods A sampled signal has a Fourier spectrum that is periodically repeated version of the spectrum of the signal sampled. If a signal is sampled at a rate greater than twice its highest frequency, the aliases will not overlap A band-limited periodic signal can't be completely described by a finite set of numbers. h) The FFT is a very efficient algorithm for computing the DFT but only when the number of points is an integer power of 2. Impulse response to causal filters start at time equal to zero. If a signal is bandlimited it cannot be properly sampled according to the sampling theorem