spectral_filter()

std::vector< double > MayaFlux::Kinesis::Discrete::spectral_filter	(	std::span< const double >	src,
		double	lo_hz,
		double	hi_hz,
		double	sample_rate,
		uint32_t	window_size = 1024,
		uint32_t	hop_size = 256
	)

Hard bandpass filter: zero all bins outside [lo_hz, hi_hz].

Parameters

src	Input samples
lo_hz	Lower frequency bound (Hz)
hi_hz	Upper frequency bound (Hz)
sample_rate	Sample rate (Hz)
window_size	FFT frame size
hop_size	Analysis hop

Returns

Filtered output

Definition at line 123 of file Spectral.cpp.

{
    const double bin_hz = sample_rate / static_cast<double>(window_size);
 
    return apply_spectral(src, window_size, hop_size,
        [lo_hz, hi_hz, bin_hz](std::vector<std::complex<double>>& spec, size_t) {
            for (size_t b = 0; b < spec.size(); ++b) {
                const double f = static_cast<double>(b) * bin_hz;
                if (f < lo_hz || f > hi_hz)
                    spec[b] = {};
            }
        });
}

References apply_spectral(), and b.

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