IIR Filters (Infinite Impulse Response Filters)

IIR filters (Infinite Impulse Response filters) are a type of digital filter used in signal processing to modify or filter audio, video, or other data signals. They work by using previous input and output values to determine the current output, creating a feedback loop that continues indefinitely—hence "infinite impulse response." This design allows IIR filters to achieve sharp filtering effects with fewer calculations compared to other filters. They are widely used in applications like audio equalization and noise reduction because of their efficiency and effectiveness in shaping signals.