Infinite Impulse Response (IIR) Filter

An Infinite Impulse Response (IIR) filter is a type of electronic filter used to process signals, such as sound or data streams. It adjusts the input signal by combining current and past input values with past output values, creating a response that theoretically lasts forever—hence "infinite." This allows the filter to efficiently remove unwanted parts (like noise) or emphasize certain features. Because it uses previous outputs, an IIR filter can achieve complex filtering with fewer components compared to other designs, making it effective for real-time signal processing in various applications.