FIR filter (Finite Impulse Response)

An FIR (Finite Impulse Response) filter is a type of digital filter used in signal processing to modify or shape signals, such as audio or data streams. It works by taking in a series of input values and computing an output through a weighted sum of these values. The term "finite" means it considers only a limited number of past inputs, making the output depend on recent data. This structure ensures the filter is stable and produces a predictable response. FIR filters are valued for their accuracy, ease of design, and ability to precisely control how signals are filtered or cleaned.