harmonic_enhance()

std::vector< double > MayaFlux::Kinesis::Discrete::harmonic_enhance	(	std::span< const double >	src,
		double	enhancement_factor,
		uint32_t	window_size = 1024,
		uint32_t	hop_size = 256
	)

Linear spectral tilt: scale each bin by a factor that rises linearly from 1 at bin 0 to enhancement_factor at the Nyquist bin.

This is a first-order spectral emphasis, not a true harmonic detector; caller should be aware that it brightens high-frequency energy uniformly regardless of harmonic * structure.

Parameters

src	Input samples
enhancement_factor	Gain at the Nyquist bin (> 1 brightens, < 1 darkens)
window_size	FFT frame size
hop_size	Analysis hop

Returns

Enhanced output

Definition at line 155 of file Spectral.cpp.

{
    const auto nyquist_bin = static_cast<double>((double)window_size / 2);
 
    return apply_spectral(src, window_size, hop_size,
        [enhancement_factor, nyquist_bin](std::vector<std::complex<double>>& spec, size_t) {
            for (size_t b = 1; b < spec.size(); ++b) {
                const double t = static_cast<double>(b) / nyquist_bin;
                spec[b] *= 1.0 + (enhancement_factor - 1.0) * t;
            }
        });
}

References apply_spectral(), and b.

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