Finite Impulse Response (FIR) refers to a type of digital filter used in signal processing. The defining characteristic of FIR filters is that their impulse response— the output of the filter when presented with an impulse input— is finite in duration. This means that the filter responds to an input signal and then settles to zero after a certain number of discrete time steps. ### Key Characteristics of FIR Filters: 1. **Finite Duration**: The output only relies on a finite number of input samples.
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