zero_crossing_rate()

std::vector< double > MayaFlux::Kinesis::Discrete::zero_crossing_rate	(	std::span< const double >	data,
		size_t	n_windows,
		uint32_t	hop_size,
		uint32_t	window_size
	)

Zero-crossing rate per window.

Normalised by (window_size - 1), giving crossings per sample.

Parameters

data	Input span
n_windows	Pre-computed window count from num_windows()
hop_size	Samples between window starts
window_size	Samples per window

Returns

Per-window ZCR values

Definition at line 112 of file Analysis.cpp.

{
    std::vector<double> out(n_windows);
    std::vector<size_t> idx(n_windows);
    std::iota(idx.begin(), idx.end(), 0);
 
    Parallel::for_each(Parallel::par_unseq, idx.begin(), idx.end(),
        [&](size_t i) {
            const size_t start = i * hop_size;
            auto w = data.subspan(start, std::min<size_t>(window_size, data.size() - start));
            int zc = 0;
            for (size_t j = 1; j < w.size(); ++j) {
                if ((w[j] >= 0.0) != (w[j - 1] >= 0.0))
                    ++zc;
            }
            out[i] = static_cast<double>(zc) / static_cast<double>(w.size() - 1);
        });
 
    return out;
}

References MayaFlux::zero_crossing_rate().

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