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Finite impulse response (FIR) filter is a type of a digital filter. The impulse response, the filter's response to a Kronecker delta input, is 'finite' because it settles to zero in a finite number of sample intervals. This is in contrast to infinite impulse response filters which have internal feedback and may continue to respond indefinitely.
A FIR filter has a number of useful properties which sometimes make it preferable to an infinite impulse response filter. FIR filters:
* Are inherently stable. This is due to the fact that all the poles are located at the origin and thus are located within the unit circle.
* Require no feedback. This means that any rounding errors are not compounded by summed iterations. The same relative error occurs in each calculation.
* They can be designed to be linear phase, which means the phase change is proportional to the frequency.
A FIR filter has a number of useful properties which sometimes make it preferable to an infinite impulse response filter. FIR filters:
* Are inherently stable. This is due to the fact that all the poles are located at the origin and thus are located within the unit circle.
* Require no feedback. This means that any rounding errors are not compounded by summed iterations. The same relative error occurs in each calculation.
* They can be designed to be linear phase, which means the phase change is proportional to the frequency.
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