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Anti-aliasing filter — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Anti-aliasing_filter
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T14:13:54.659Z
SHA-256 of the archived text: f74b0d91656af57ba200194b83ce399ed7ad41177071eedabffaf302ca10da0f
Stable URL of this page: https://metraipolis.com/documento/dc_423c4ff58df5

How to cite

Anti-aliasing filter — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Anti-aliasing_filter (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_423c4ff58df5 (Metraipolis archive dc_423c4ff58df5, sha256 f74b0d91656af57ba200194b83ce399ed7ad41177071eedabffaf302ca10da0f)

BibTeX

@misc{dc423c4ff58df5,
  title = {Anti-aliasing filter — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Anti-aliasing_filter},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_423c4ff58df5; sha256 f74b0d91656af57ba200194b83ce399ed7ad41177071eedabffaf302ca10da0f},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Anti-aliasing_filter. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

An anti-aliasing filter (AAF) is a filter used before a signal sampler to restrict the bandwidth of a signal to satisfy the Nyquist–Shannon sampling theorem over the band of interest. Since the theorem states that unambiguous reconstruction of the signal from its samples is possible when the power of frequencies above the Nyquist frequency is zero, a brick wall filter is an idealized but impractical AAF. A practical AAF makes a trade off between reduced bandwidth and increased aliasing. A practical anti-aliasing filter will typically permit some aliasing to occur or attenuate or otherwise distort some in-band frequencies close to the Nyquist limit. For this reason, many practical systems sample higher than would be theoretically required by a perfect AAF in order to ensure that all frequencies of interest can be reconstructed, a practice called oversampling.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Anti-aliasing filter» — https://en.wikipedia.org/wiki/Anti-aliasing_filter
Wikidata Q858325: «tecnica per la riduzione della scalettatura nelle immagini digitali» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q858325
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Anti-aliasing_filter?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1377462096, consultata il 2026-11-09T14:09:36.560Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: e57f64e4bafe9b3642da93f0d2d845b8a5491898f2b150e68142f3f3aec45351