find_zero_crossing_positions()

std::vector< size_t > MayaFlux::Yantra::find_zero_crossing_positions	(	std::span< const double >	data,
		double	threshold = 0.0
	)

Find actual zero-crossing positions in the signal.

Unlike compute_zero_crossing_energy which returns ZCR per window, this returns the actual sample indices where zero crossings occur.

Parameters

data	Input data span
threshold	Threshold value for crossing detection (default: 0.0)

Returns

Vector of sample positions where crossings occur

Definition at line 217 of file AnalysisHelper.cpp.

{
    std::vector<size_t> positions;
    positions.reserve(data.size() / 4);
 
    for (size_t i = 1; i < data.size(); ++i) {
        bool current_above = (data[i] >= threshold);
        bool previous_above = (data[i - 1] >= threshold);
 
        if (current_above != previous_above) {
            positions.push_back(i);
        }
    }
 
    positions.shrink_to_fit();
    return positions;
}

References find_zero_crossing_positions().

Referenced by MayaFlux::Yantra::EnergyAnalyzer< InputType, OutputType >::create_analysis_result(), and find_zero_crossing_positions().

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