Function generateSyntheticFFT

tests/fl/audio/test_helpers.h:157–169

Generate synthetic FFT bin data with a peak at specified frequency. Uses linear bin spacing (for use with FrequencyBinMapper and raw FFT data). @param numBins Number of frequency bins @param peakFrequency Frequency where the peak should occur (Hz) @param sampleRate Sample rate in Hz @return Vector of float magnitudes (one per bin)

/// @param sampleRate Sample rate in Hz
/// @return Vector of float magnitudes (one per bin)
inline vector<float> generateSyntheticFFT(size numBins, float peakFrequency, u32 sampleRate) {
    vector<float> bins;
    bins.reserve(numBins);
    float binWidth = sampleRate / (2.0f * numBins);
    for (size i = 0; i < numBins; ++i) {
        float binFreq = i * binWidth;
        // Gaussian-like peak centered at peakFrequency
        float distance = fl::abs(binFreq - peakFrequency) / binWidth;
        float magnitude = fl::exp(-distance * distance / 2.0f);
        bins.push_back(magnitude);
    }
    return bins;
}

/// Generate synthetic CQ-spaced FFT bin data with a peak at specified frequency.
/// Uses CQ log-spaced frequency layout matching the actual CQ kernel.