Second Order Sections (SoS) Filter

The SosFilter class provides an implementation of a Second Order Sections (SoS) filter. For more information please see series second-order sections as well as Digital Biquad Filter.

API Reference

Header File

• components/filters/include/sos_filter.hpp

Classes

template<size_t N, class SectionImpl>
class SosFilter

Second Order Sections Filter.

Note

See https://en.wikipedia.org/wiki/Digital_biquad_filter

Note

See https://www.dsprelated.com/freebooks/filters/Series_Second_Order_Sections.html

Subclassed by espp::ButterworthFilter< ORDER, Impl >

Public Functions

inline explicit SosFilter(const std::array<TransferFunction<3>, N> &config)

Construct a second order sections filter.

Parameters:

config – Array of TransferFunction<3> for configuring each of the biquad sections.

inline float update(float input)

Filter the signal sampled by input, updating internal state, and returning the filtered output.

Parameters:

input – New sample of the input data.

Returns:

Filtered output based on input and history.

inline float operator()(float input)

Filter the signal sampled by input, updating internal state, and returning the filtered output.

Parameters:

input – New sample of the input data.

Returns:

Filtered output based on input and history.