Function

Simple iir filter implementation in C++

Simple iir filter implementation in C++
  1. How are IIR filters implemented?
  2. What are the steps to design IIR filter?

How are IIR filters implemented?

Use a function to implement each biquad, such as the example C biquad function or a biquad function supplied with a DSP library. Export biquad coefficients from your IIR design program in the format required by the biquad function you use. Implement the overall IIR filter by cascading biquads.

What are the steps to design IIR filter?

In general, the design of an IIR filter usually involves one or more strategically placed poles and zeros in the z-plane, to approximate a desired frequency response. An analogue filter can always be described by a frequency- domain transfer function of the general form, shown in Equation 5.1.

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