Finite Impulse Response (FIR) Filter

A Finite Impulse Response (FIR) filter is a type of digital filter used to modify signals, such as audio or data streams. It works by taking a finite number of recent input values, multiplying each by a specific coefficient, and adding the results to produce an output. This process effectively emphasizes, attenuates, or shapes certain parts of the signal, allowing for tasks like noise reduction or signal sharpening. FIR filters are valued for their stability and precision, as they depend only on current and past input samples, making them reliable tools in digital signal processing.