generate_spectrum_ratios()

std::vector< double > MayaFlux::Nodes::ModalNetwork::generate_spectrum_ratios ( Spectrum  spectrum, size_t  count  )

staticprivate

Generate frequency ratios for predefined spectra.

Definition at line 40 of file ModalNetwork.cpp.

{
    std::vector<double> ratios;
    ratios.reserve(count);
 
    switch (spectrum) {
    case Spectrum::HARMONIC:
        // Perfect integer harmonics: 1, 2, 3, 4...
        for (size_t i = 0; i < count; ++i) {
            ratios.push_back(static_cast<double>(i + 1));
        }
        break;
 
    case Spectrum::INHARMONIC:
        // Bell-like spectrum (approximate mode ratios for circular plates)
        // Based on Bessel function zeros
        ratios = { 1.0, 2.756, 5.404, 8.933, 13.344, 18.64, 24.81, 31.86 };
        while (ratios.size() < count) {
            double last = ratios.back();
            ratios.push_back(last + 6.8);
        }
        ratios.resize(count);
        break;
 
    case Spectrum::STRETCHED:
        // f_n = n * f_0 * sqrt(1 + B * n^2)
        // Using small B = 0.0001 for moderate stretching
        {
            constexpr double B = 0.0001;
            for (size_t n = 1; n <= count; ++n) {
                double ratio = n * std::sqrt(1.0 + B * n * n);
                ratios.push_back(ratio);
            }
        }
        break;
 
    case Spectrum::CUSTOM:
        // Should not reach here - custom ratios provided directly
        for (size_t i = 0; i < count; ++i) {
            ratios.push_back(static_cast<double>(i + 1));
        }
        break;
    }
 
    return ratios;
}

References B, CUSTOM, HARMONIC, INHARMONIC, and STRETCHED.

Referenced by ModalNetwork().

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