Chapter 11Audio Filter Designs: IIR Filters
It’s time to put the theory into practice and make some audio filters and 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 commonly used methods for calculating the coefficients of IIR filters:
- 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
- APF: All-pass filter
- HSF: High shelf filter
- LSF: Low shelf filter
- PEQ: Parametric EQ filter
- GEQ: Graphic EQ system
11.1 Direct z-Plane Design
In this first category of design techniques, ...
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