IIR

IIR stands for Infinite Impulse Response, a type of digital filter used in signal processing. It analyzes signals, like audio or data, by considering current and past input values to produce an output. Unlike other filters, IIR filters have feedback loops, meaning the output influences future calculations, which can make their responses last indefinitely—hence "infinite" impulse response. They are efficient because they can achieve complex filtering with fewer calculations, but require careful design to avoid instability. Overall, IIR filters are essential tools for shaping, reducing noise, or extracting specific features from digital signals.