IIR (Infinite Impulse Response) filters

An IIR (Infinite Impulse Response) filter is a type of digital filter used to modify or analyze signals, such as audio or data streams. Unlike filters with limited memory, IIR filters use both current and past input data, as well as past output data, to produce their output. This feedback loop allows them to effectively shape signals with fewer calculations, making them efficient. They can create sharp frequency adjustments and are often used in audio processing, communications, and control systems. However, they can also introduce stability challenges, requiring careful design to ensure reliable performance.