degrade.vocoder

Channel vocoder degradation.

noise_vocode

Apply channel vocoding following Shannon et al. (1995).

Implements logarithmic band spacing, Butterworth filters, half-wave rectified Hilbert envelopes, low-pass smoothing, and carrier modulation.

Signature

noise_vocode(audio, sr, n_bands=8, freq_range=(200, 8000), envelope_cutoff=160.0, vocoder_type="noise", filter_order=3)

Args

• vocoder_type: "noise" or "sine"
• n_bands: Number of spectral channels
• freq_range: (low_hz, high_hz)
• envelope_cutoff: Low-pass cutoff for envelope (Hz)
• filter_order: Butterworth filter order