CHAPTER 6
Audio Filter Designs: IIR Filters
It's time to put the theory into practice and make some audio filters and equalizers (EQs). You know that the coefficients of a filter determine its frequency response and other characteristics. But how do you find the coefficients? There are two fundamental ways to find the coefficients of the infinite impulse response (IIR) filter:
• Direct z-plane design
• Analog filter to digital filter conversion
This chapter uses the following filter naming conventions:
• LPF: Low-pass filter
• HPF: High-pass filter
• BPF: Band-pass filter
• BSF: Band-stop filter
6.1 Direct z-Plane Design
In this first category of design techniques, you manipulate the poles and zeros directly in the z-plane to create the ...
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