FIR (Finite Impulse Response)

A Finite Impulse Response (FIR) filter is a type of digital filter used to process signals, like audio or data. It works by taking a set number of input values, multiplying each by specific weights (coefficients), and then summing those results to produce an output. The "finite" aspect means it uses only a limited, fixed number of inputs for each calculation, making it stable and predictable. FIR filters are common because they can be designed to have precise filtering characteristics, effectively removing unwanted parts of a signal or enhancing specific features without relying on past outputs.