FIR Filter

• Difference equation (inner product)

y(n) = 2 x(n) + x(n - 1) + x(n - 2) + x(n - 3)

y(n)

x(n)

z-1

z-1

z-1

1

1

2

1

• Vector dot product plus circularly buffer input

Tappeddelay line

• Signal flow graph

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