AN3984 is a STMicroelectronics application note that introduces the formulas to calculate the IIR filter coefficients for Sound Terminal® devices
This document serves as a tool for calculating IIR filter coefficients to program Sound Terminal devices manufactured by STMicroelectronics. It details the procedures and formulas required to design first-order low-pass and high-pass filters, as well as second-order filters, including specialized parametric biquad EQ filters. The guide defines key parameters such as cutoff frequency, sampling frequency, quality factor, slope, and gain to determine the digital filter transfer function coefficients.
The document provides a tool to calculate IIR filter coefficients for programming Sound Terminal devices from STMicroelectronics.