fir

A FIR, or Finite Impulse Response filter, is a type of digital filter used in signal processing to modify signals. It works by applying a set of fixed coefficients to a sequence of input data points, producing an output that emphasizes or reduces certain aspects of the original signal—such as filtering out noise or extracting specific frequencies. Because it relies on a finite number of past inputs, it’s stable and predictable. FIR filters are widely used in audio, communications, and data analysis for their effectiveness and ease of design.