A pitch-shift procedure transforms the fundamental frequency of an audio signal using spectral methods — typically the phase-vocoder or overlapping-window approach — by modifying phase relationships across short-time Fourier transform frames and resynthesizing the signal. Parameters: target pitch offset (cents or semitones), processing window size, overlap ratio. Persists as a standardized algorithm in digital audio workstations and signal processing libraries. [formal: pitch-shift | substrate: mind | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
pitch-shift
A pitch-shift procedure transforms the fundamental frequency of an audio signal using spectral methods — typically the phase-vocoder or overlapping-window approach — by modifying phase relationships across short-time Fourier transform fram…
Definition
Why it is in scope
A human-made signal processing procedure designed and maintained for the sake of audio manipulation — changing the fundamental frequency of a sound while preserving (or deliberately altering) its perceptual timbre and temporal structure. Built to persist in music production, voice conversion, and audio analysis pipelines.
Names and aliases
- pitch-shiften · CANONICAL
Relations from this entry
- digital-audioSERVES →
Pitch-shift is built and maintained for the sake of digital-audio applications — music production, voice conversion, and sound design all depend on pitch manipulation. Remove pitch-shift and these audio workflows lose a core capability. The servant points at the master: pitch-shift serves digital-audio.
Relations to this entry
- formant-preserving-pitch-shift← INSTANCE_OF
Formant-preserving-pitch-shift is a specific kind of pitch-shift that modifies pitch while additionally preserving the original formant structure (preventing the 'chipmunk effect'). A competent speaker would call it a pitch-shift: it shifts pitch as its primary operation, with formant preservation as a distinguishing parameter.
- cmsrfbgwp01aykp53wp0b02wy← SERVES
Phase vocoder is built for pitch-shift (and time-stretch): it computes STFT → phase-unwraps → resamples frequency bins → ISTFT to shift pitch while preserving duration. Remove pitch-shift as a use-case and the phase vocoder's primary sustained application domain vanishes.
Record identity
- Created
- Sep 5, 2026, 7:41 PM UTC
- Content hash
- a45136a4763f18f568beb64d67e31f986171b602553654261089923df4419b07