@audio/filter-spectral-tilt

Spectral tilt filter: apply a constant dB/octave slope to the spectrum

npm install @audio/filter-spectral-tilt

import spectralTilt from '@audio/filter-spectral-tilt'

Applies a constant dB/octave slope — tilts the entire spectrum.

Model: cascade of 8 octave-spaced first-order shelving sections approximating a fractional power-law spectrum $S(f) \propto f^\alpha$; positive slope boosts highs, negative slope cuts them slope: $\alpha = -3,\text{dB/oct}$ gives pink noise character; $-6,\text{dB/oct}$ gives brownian/red noise Accuracy: measured slope tracks the requested dB/oct to within ~20% (inherent to the 8-stage shelving cascade) — e.g. slope: +3 measures ≈+2.4 dB/oct, slope: -6 measures ≈-4.9 dB/oct

spectralTilt(buffer, { slope: -3, fs: 44100 })   // −3 dB/oct: pink noise character
spectralTilt(buffer, { slope: +3, fs: 44100 })   // +3 dB/oct: pre-emphasis for coding

| Param | Default | | |---|---|---| | slope | 0 | dB/octave; 0 is a no-op (returns data unmodified) | | fs | 44100 | sample rate, Hz |

Pass the same params object on every call to persist the 8-section cascade state across blocks.

Use when: matching microphone/speaker frequency responses, spectral coloring, noise synthesis.

Part of @audio/filter — the filter family umbrella. This README is generated from the umbrella docs.

MIT © audiojs