zero_crossings_per_channel()

MAYAFLUX_API std::vector< std::vector< size_t > > MayaFlux::zero_crossings_per_channel	(	const std::vector< Kakshya::DataVariant > &	channels,
		double	threshold = 0.0
	)

Detect zero crossings per channel for multi-channel signal.

Parameters

channels	Vector of channel data
threshold	Minimum amplitude difference for crossing detection (default: 0.0)

Returns

Vector of zero crossing indices for each channel

Definition at line 380 of file Yantra.cpp.

{
    static const auto s_op = [] {
        auto a = std::make_shared<Yantra::StandardEnergyAnalyzer>();
        a->set_energy_method(Yantra::EnergyMethod::ZERO_CROSSING);
        return a;
    }();
    auto result = s_op->analyze_energy(channels);
    std::vector<std::vector<size_t>> all_crossings;
    all_crossings.reserve(result.channels.size());
 
    for (size_t ch = 0; ch < result.channels.size(); ++ch) {
        const auto& positions = result.channels[ch].event_positions;
        if (threshold <= 0.0) {
            all_crossings.push_back(positions);
            continue;
        }
        auto double_data = std::get<std::vector<double>>(channels[ch]);
        std::vector<size_t> filtered;
        for (size_t pos : positions) {
            if (pos < double_data.size() && std::abs(double_data[pos]) >= threshold)
                filtered.push_back(pos);
        }
        all_crossings.push_back(filtered);
    }
    return all_crossings;
}

References a, and MayaFlux::Yantra::ZERO_CROSSING.