Spectral flanger is a human-made audio effect technique that produces the flanger's characteristic moving comb-filter notches by realizing the flanging delay in the frequency domain instead of as a time-domain delay line. Mechanism: the input is decomposed into a time-frequency representation (typically the STFT); a short, slowly modulated spectral delay is applied as a time-varying linear phase ramp (or equivalent per-bin phase/gain modulation) across the bins; the delayed and undelayed representations are summed and resynthesized, so notches sweep the spectrum at the modulation rate. Parameters: (1) modulation depth of the spectral delay (up to roughly 15 ms worth of phase); (2) LFO modulation rate (typically 0.01-10 Hz); (3) wet/dry mix ratio; (4) optional comb feedback; (5) analysis window and hop. It is distinct from the classic delay-line flanger (a sample-accurate time shift mixed with the dry signal) and from time-stretching (which rescales the whole spectrum rather than modulating a narrowband delay). Persistence mechanism: the technique is fixed by its algorithmic recipe (spectral decomposition, modulated per-bin delay, summation, resynthesis) and persists as reusable DSP code and effect-design documentation in audio-effect toolkits and research implementations. [formal: spectral-flanger | substrate: behavior | horizon: hours | explicit: yes | epoch: 0.01]
Accepted ontology entry
spectral-flanger
Spectral flanger is a human-made audio effect technique that produces the flanger's characteristic moving comb-filter notches by realizing the flanging delay in the frequency domain instead of as a time-domain delay line. Mechanism: the in…
Definition
Why it is in scope
Human-made audio effect technique built to persist as a reusable DSP method for creating moving spectral notches via frequency-domain delay modulation.
Names and aliases
- spectral-flangeren · CANONICAL
Relations from this entry
- cmspltmgd05tcjlsse8vqfce1DEPENDS_ON →
Spectral-flanger applies time-varying comb filtering in frequency domain via STFT analysis and resynthesis; remove STFT and the effect has no spectral bins to modulate, ceasing operation.
- cmspdibrl04whjlssto99iiufDEPENDS_ON →
The spectral flanger operates via FFT-based phase manipulation across frequency bins. Remove the fourier-transform and the spectral flanger cannot compute the frequency-domain decomposition needed for its mechanism. The removal test passes. Direction: spectral-flanger→fourier-transform.
- flangerDERIVED_FROM →
Law 7 which-came-first test: the delay-line flanger (dry + short LFO-modulated time delay) is the original effect; the spectral flanger realizes the same flanging delay in the frequency domain (modulated phase ramp across STFT bins) as a later derivative implementation, and its own definition names the classic delay-line flanger as the thing it is distinct from. Newer derives from older; direction spectral-flanger -> flanger.
- fast-fourier-transformDEPENDS_ON →
Remove FFT (or any DFT equivalent) — the spectral flanger stops operating. It requires frequency-domain decomposition via FFT to compute the modulated phase ramp across bins; without frequency-domain transform capability, the effect cannot function.
- digital-audioSERVES →
Spectral flangers are built for digital audio workflows — the spectral analysis and phase-vocoding techniques they use operate specifically in the digital domain. Remove digital-audio and spectral flangers have no practical application context.
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Sep 5, 2026, 10:13 PM UTC
- Content hash
- b14f6ecb4de370e816d35e227902bb3129a530bbdd07cce9e553c8f06065c85a