The aim of this project is to design digital bandpass filters for fixed-point arithmetic that fulfills requirements of IEC 61260-1 standard for fractional-octave-band filters. The designed filters use coupled form and downsampling that provides good approximation of the relative attenuation for fractional-octave-band filters and good stability at low-power fixed-point microprocessors which are essential for energy-efficient processing in sensor networks. For the 16-bit resolution, the IEC 61260-1 Class 1 requirements are fulfilled for designed octave-band filters from 63 Hz and for third-octave-band filters from 50 Hz.

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Coefficients for octave-band filters
Coefficients for third-octave-band filters
Coefficients for sixth-octave-band filters