**Definition:**An FIR (finite impulse response) filter is a type of digital filter that is commonly used to process signals in a wide range of applications, including audio processing, image processing, and biomedical signal processing. An FIR filter is characterized by a finite impulse response, which means that the output of the filter is a weighted sum of a finite number of past and present input samples. The impulse response of an FIR filter is typically a finite sequence of coefficients used to compute the output of the filter. The input signal is convolved with the impulse response to produce the output signal.

**Alternative definition:**

**Synonym:**

**References:**

**Related terms:**