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.