Figure P6.33 shows a system commonly used to obtain a highpass filter from a lowpass filter and vice versa.
(a) Show that, if H(jω) is a lowpass filter with cutoff frequency , the overall system corresponds to an ideal highpass filter. Determine the system's cutoff frequency and sketch its impulse response.
(b) Show that, if H(jω) is an ideal highpass filter with cutoff frequency , the overall system corresponds to an ideal lowpass filter, and determine the cutoff frequency of the system.
(c) If the interconnection of Figure P6.33 is applied to an ideal discrete-time lowpass filter, will the resulting system be an ideal discrete-time highpass filter?
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