Feature Extraction & Mel Filterbanks

Sonon extracts audio features in streaming 10 ms frames (160 samples @ 16 kHz):

• Windowing: Hann, Hamming, and Blackman windows.
• Radix-2 Cooley-Tukey FFT: 512-point spectral magnitude.
• Mel Filterbank: 13 to 40 triangular filter bins.
• PCEN: Per-Channel Energy Normalization replacing logarithmic compression for dynamic range resilience under high acoustic variance.