5.4 Linear-Phase FIR Filter Design by Windows. The design of a linear- phase FIR filter using the window method gives an impulse response of the form h(n) = w(n) - d(n) where w(n) is the window function and d(n) is the inverse DTFT of the ideal frequency response. The figures below show the impulses responses and frequency responses of six filters designed using the window method. But they are out of order. Match each frequency response to its impulse response by completing the table. Impulse Response Frequency Response IMPULSE RESPONSE 1 IMPULSE RESPONSE 2 0.2 0.2 0.15 0.15 0.1 0.05 0.05 -0.05 -0.05 10 20 30 40 0 10 20 30 40 IMPULSE RESPONSE 3 IMPULSE RESPONSE 4 0.6 0.6 D.4 0.4 0.2 02 10 20 30 40 10 20 30 40 IMPULSE RESPONSE 5 IMPULSE RESPONSE 6 0.2 0.2 0.1 0.1 -0.1 0.1 -0.2 -0.2 10 20 30 40 0 10 20 30 40