@audio/saturate-transistor

Transistor/console saturation — odd-symmetric cubic, 3rd-harmonic dominant

npm install @audio/saturate-transistor

import transistor from '@audio/saturate-transistor'

Solid-state/console-style saturation: an odd-symmetric cubic soft clip (v − v³/3, hard-limited past ±1). Odd symmetry means only odd harmonics (3rd-dominant) appear — no DC shift, no even-harmonic warmth, the "console" color as distinct from tube's asymmetric even-harmonic signature. Oversampled (windowed-sinc up → shape → windowed-sinc down) to keep the extra harmonics from aliasing.

transistor(data, { drive: 3, fs: 44100 })
transistor(data, { drive: 6, mix: 0.5 })

| Param | Default | | |---|---|---| | drive | 2 | pre-gain into the cubic soft-clip curve | | fs | 44100 | sample rate | | oversample | 4 | oversample factor; 1 disables oversampling (naive, aliased) | | mix | 1 | 0..1 — wet/dry blend |

Mutates data in place and returns it (same array reference, not a copy). 3rd-harmonic energy measurably exceeds 2nd-harmonic at equal drive (odd-dominant) — verified in the family test suite via Goertzel analysis.

Use when: solid-state/console-style "grit" and edge. Not for: warm even-harmonic tube color (use tube) or a plain normalized tanh (use waveshaper).

Part of the @audio/saturate family.

MIT © audiojs