IIR (Infinite Impulse Response) filters are a type of digital filter whose impulse response continues indefinitely. They are characterized by the use of feedback in their design, which gives them the potential for sharp cutoff frequencies and efficient implementations. IIR filters are commonly used in audio processing, control systems, and signal processing applications where steep filter slopes are required. However, due to their feedback nature, they can be more susceptible to instability compared to FIR (Finite Impulse Response) filters.
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