![]() The transfer function of an IIR filter contains both poles and zeros. IIR filters differ from FIR filters because they always contain feedback elements in the circuit, which can make the transfer functions more complicated to work with. IIR filters are typically designed basing on continuous-time transfer functions. IIR Filters (infinite impulse response filter) However, FIR filters suffer from low efficiency, and creating an FIR to meet a given spec requires much more hardware than an equivalent IIR filter. The transfer function of an FIR filter contains only zeros and either no poles or poles only at the origin.Īn FIR filter with symmetric coefficients is guaranteed to provide a linear phase response, which can be very important in some applications. The response of an FIR filter to δ, denoted as h, will decay to zero after a finite number of samples. If we define the discrete time impulse function as Therefore, only very specific analog filters are capable of implementing an FIR filter. There is no equivalent in continuous-time systems. There are two types of filters in the digital realm: Finite Impulse Response (FIR) filters and Infinite Impulse Response (IIR) filters.įIR filters are specific to sampled systems. 1.2.1 Filtering a time-series in Octave/Sciplotĭigital Filter Types.1.2 IIR Filters (infinite impulse response filter). ![]()
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