@audio/spatial-binaural

Structural binaural panner — Brown-Duda spherical-head ITD + head-shadow ILD (no HRIR data)

npm install @audio/spatial-binaural

import binaural from '@audio/spatial-binaural'

Places mono-collapsed input in space by azimuth: interaural time delay (Woodworth/Brown-Duda eq. 2) plus a one-pole-one-zero head-shadow filter (eq. 3-5), per C. P. Brown & R. O. Duda, "A Structural Model for Binaural Sound Synthesis," IEEE Trans. Speech and Audio Processing, 6(5), 1998. No HRIR/measured-response data — azimuth cues only, no elevation (see rationale below). Modifies left/right in place.

binaural(left, right, { azimuth: -30 })   // both modified in place

| Param | Default | | |---|---|---| | azimuth | 0 | Degrees, -180..180 (0 front, +right) | | distance | 1 | Meters — 1/distance gain falloff | | headRadius | 0.0875 | Meters — Brown-Duda head model radius | | mix | 1 | Dry/wet, 0..1 | | fs | 44100 | Sample rate |

Use when: headphone spatialization without HRIR assets; azimuth-only — elevation (pinna echoes, Brown-Duda eq. 8) is out of scope because the paper's own scaling factor is a per-listener fit, not a general physical constant.

Part of @audio/spatial — the spatial family umbrella.

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