78423.3.1 Filter Topologies..................................................................... 794
23.3.1.1 Sallen-Key...................................................................... 794
23.3.1.2 State Variable................................................................... 795
23.3.1.3 All-Pass Filter................................................................... 796
23.3.2 Pole-Zero Analysis................................................................... 796
23.3.2.1 Zeros.......................................................................... 797
23.3.2.2 Poles.......................................................................... 797
23.3.2.3 Stability........................................................................ 797
23.4 Switched Capacitor Filters................................................................ 797
23.5 Digital Filters.......................................................................... 797
23.5.1 FIR Filters.......................................................................... 798
23.5.1.1 FIR Coefficients................................................................. 798
23.5.1.2 FIR Length..................................................................... 799
23.5.2 IIR Filters.......................................................................... 799
23.5.2.1 Calculation of Coefficients from Poles and Zeros....................................... 799
23.6 Equalizers............................................................................. 800
23.6.1 Tone Control........................................................................ 800
23.6.2 Graphic Equalizers................................................................... 800
23.6.2.1 Transversal Equalizers............................................................ 801
23.6.3 Parametric Equalizers................................................................. 801
23.6.3.1 Semi-Parametric Equalizers........................................................ 801
23.6.3.2 Symmetric or Asymmetric Q....................................................... 802
23.6.4 Programmable Equalizers.............................................................. 802
23.6.5 Adaptive Equalizers.................................................................. 802
References................................................................................. 802