| FIR
filter |
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| Discrete time
LTI (Linearity and Time Invariance) systems |
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| can be classified
into FIR and IIR. |
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| An FIR filter has
impulse response h(n) that extends only |
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| over a finite
time interval, say 0≤ n ≤ M, and is |
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| identically zero
beyond that: |
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| {h0, h1, h2 . . . , hM, 0, 0, 0 . . .} |
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| M is referred to
as the filter order. |
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| The output y(n)
in FIR is simplified to the finite-sum form: |
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| or, explicitly |
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