Module dsp 

Digital Signal Processing Module

This module provides a collection of reusable DSP functions used by various analysis algorithms. It includes implementations for digital filters, transforms, and advanced feature extraction like autocorrelation and period-informed peak finding.

Structs

Sos

Functions

autocorrelation

Chooses the most efficient autocorrelation method based on signal length.

butterworth_lowpass

Designs a digital Butterworth lowpass filter.

calculate_center_line

Calculates a dynamic “center line” of a signal.

filtfilt

Applies a zero-phase (forward-backward) digital filter.

find_dominant_period

Finds the dominant period by analyzing a pre-computed autocorrelation function (ACF).

find_extrema_with_period

Finds local maxima and minima using two independent “peak-hopping” searches.

find_extrema_with_savgol

Finds extrema using Savitzky-Golay derivatives.

find_zero_crossing_pulses

Finds the peak of every pulse defined by zero-crossings in the signal.

hilbert_transform

Computes the Hilbert transform of a real-valued signal using the FFT method.