A pitch-shifter is a human-made audio processing technique and device that changes the pitch of an audio signal (its fundamental frequency and harmonic structure) while preserving its duration, in contrast to playback-speed changes that trade pitch for time. Parameters: (1) pitch interval — the transposition ratio, expressed in semitones or a continuous frequency multiplier r applied without altering playback time; (2) the duration-preservation constraint — the output timeline stays aligned to the input timeline, which is the carve separating pitch-shifting from varispeed; (3) time-alignment mechanism — PSOLA/WSOLA pitch marking and time realignment, phase-vocoder spectral interpolation, granular segmentation and re-synthesis, or resampling with time correction; (4) artifact behavior — phase smearing and granularity as a function of shift magnitude. Persistence mechanism: hardware pedals and rack units, software plugins in standardized formats (VST, AU, AAX), and DSP algorithms embedded in DAWs and synthesizers, transmitted through music-production practice. [formal: mutatio toni | substrate: behavior | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
pitch-shifter
A pitch-shifter is a human-made audio processing technique and device that changes the pitch of an audio signal (its fundamental frequency and harmonic structure) while preserving its duration, in contrast to playback-speed changes that tr…
Definition
Why it is in scope
A human-made audio processing device or algorithm that changes the pitch of an audio signal while preserving its duration, built to persist as hardware pedal, rack unit, or software plugin.
Names and aliases
- pitch-shifteren · CANONICAL
Relations from this entry
- delay-lineDEPENDS_ON →
Pitch shifting via time-domain processing requires variable delay lines to resample the signal. Remove delay-line and the core time-stretch mechanism stops operating.
- cmsdfdqpw03tt3vv3zzh0uh0qDEPENDS_ON →
Pitch shifting changes the playback rate of digital audio, which is fundamentally sample-rate conversion. Remove resampling — the signal cannot be converted to the target pitch — and the pitch shifter has no mechanism to produce its output. Resampling is the core operation.
- audio-effectINSTANCE_OF →
A pitch-shifter is a specific kind of audio-effect: it alters sound by changing its pitch while preserving duration. A competent audio engineer would call a pitch-shifter 'an audio effect.' Pin sense: the audio effect that shifts fundamental frequency without time alteration.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Sep 7, 2026, 1:31 PM UTC
- Content hash
- 9075417fce64b796b500830a7de6cbb3162e275ab4ce77c771c11db66bbcf9e8