Consider an ideal low pass discrete time filter that has unity gain in the pass
ID: 3817624 • Letter: C
Question
Consider an ideal low pass discrete time filter that has unity gain in the pass band with cut off frequencies of plusminus 0.4 pi in the principal zone of omega cap. a.) Find the formula for the (noncausal and IIR) impulse response, h_ILP[n] of the ideal low pass discrete time filter. b.) Find a formula for a truncated and shifted version of the filter in part a to make a new filter that is causal and FIR with a duration of 13 samples, h_LP13[n]. Use a rectangular window for the truncation. What is the transfer function. H cap _LP13(e^j omega cap), for this FIR filter?Explanation / Answer
Resulting pass-band and stop-band parameters
are equal even though often the specification is more
strict in the stop band than in the pass band unnecessary high accuracy in the pass band
Ripple of the window is not uniform