Linear-phase filter is a human-made digital filter whose impulse response is symmetric, producing constant group delay across frequencies so phase response is a linear function of frequency. Parameters: filter order, window type used in design (e.g., Hamming, Kaiser), cutoff frequency, passband ripple, stopband attenuation. Persistence mechanism: implemented as FIR filter coefficients in DSP libraries, audio processing plug-ins, communications equalizers, and hardware DSP blocks; the design persists through filter-design textbooks, code repositories, and standardized implementations where linear phase is required to avoid phase distortion. [formal: filter | substrate: mind | horizon: as-long-as-us | explicit: yes | epoch: 0.01]
Accepted ontology entry
linear-phase-filter
Linear-phase filter is a human-made digital filter whose impulse response is symmetric, producing constant group delay across frequencies so phase response is a linear function of frequency. Parameters: filter order, window type used in de…
Definition
Why it is in scope
Human-made digital filter designed to preserve waveform shape by maintaining constant group delay.
Names and aliases
- linear-phase-filteren · CANONICAL
Relations from this entry
- audio-processingSERVES →
Linear-phase filter is designed and implemented for the sake of audio processing practice: it preserves waveform shape and avoids phase distortion in audio signal chains, enabling transparent filtering in music production, mastering, and communications. Servant points at master per Law 8d.
- fir-filterINSTANCE_OF →
A linear-phase filter is a specific kind of FIR filter — it uses a symmetric impulse response to produce constant group delay. Nearest kind: fir-filter.
Relations to this entry
- post-ringing← DEPENDS_ON
Post-ringing is the trailing oscillation produced by the symmetric impulse response of linear-phase filters. Remove linear-phase filters and the specific mechanism generating post-ringing disappears; the artifact stops operating as defined.
- pre-ringing← DEPENDS_ON
Pre-ringing is the time-domain overshoot before a transient that is a direct consequence of the symmetric impulse response of linear-phase filters. Remove linear-phase filtering and the mechanism that produces pre-ringing as defined ceases to manifest; the artifact has no operational context without linear-phase filter implementations. Removal test passes.
Record identity
- Created
- Aug 26, 2026, 1:06 PM UTC
- Content hash
- 01a028ab086422553f201daf95755de8e6abf944483c7824513aca3daa1eb438