About: CELT

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Constrained Energy Lapped Transform (CELT) is an open, royalty-free lossy audio compression format and a free software codec with especially low algorithmic delay for use in low-latency audio communication. The algorithms are openly documented and may be used free of software patent restrictions. Development of the format was maintained by the Xiph.Org Foundation (as part of the Ogg codec family) and later coordinated by the Opus working group of the Internet Engineering Task Force (IETF).

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rdf:type	Thing software schema:CreativeWork work wikidata:Q386724 Software yago:WikicatContainerFormats yago:WikicatXiph.OrgProjects yago:WikicatOpenFormats yago:Abstraction100002137 yago:Act100030358 yago:Activity100407535 yago:Code106355894 yago:CodingSystem106353757 yago:Communication100033020 yago:Event100029378 yago:Format106636806 yago:Information106634376 yago:Message106598915 yago:PsychologicalFeature100023100 yago:Work100575741 yago:Writing106359877 yago:WrittenCommunication106349220 yago:YagoPermanentlyLocatedEntity yago:Software106566077 yago:Undertaking100795720
rdfs:label	CELT (en) Constrained-Energy Lapped Transform (de) CELT (fr) CELT (ja) CELT (ko) CELT (zh)
rdfs:comment	CELT (abréviation de Constrained Energy Lapped Transform) est un codec audio expérimental développé par la fondation xiph.org.Il sert pour les environnements où l'on a besoin de transmettre de l'audio avec une très faible latence (par exemple dans les communications de type téléphonique).Ce codec est complémentaire à Vorbis et à Speex, car il permet d'avoir une bonne qualité audio et un faible délai à la fois. La version actuelle de CELT est la version 0.10.0 sortie le 21 décembre 2010. Il a été intégré par la suite dans le codec Opus qui a été standardisé par l'IETF le 10 septembre 2012 (fr) CELT(Constrained Energy Lapped Transform)는 공개 손실 압축 방식의 이다. (ko) CELT（ケルト、英語: Constrained Energy Lapped Transform）は、Xiph.Org Foundationが2007年末から開発が始まった、非可逆圧縮の音声コーデックである。CELTはXiph.Orgの他のプロジェクトと同じくソフトウェア特許に抵触せず、修正BSDライセンスで提供されるフリーソフトウェアである。2011年8月に開発終了になり、後継のOpus (RFC 6716)に引き継がれた。 (ja) CELT是一種開放、免版稅的有損音頻壓縮格式和自由軟件編解碼器，具有非常低的算法延遲，可用於低延遲音頻通信。這些算法是公開記錄的，其使用不受軟件專利限制。該格式的開發由Xiph.Org基金會（作為Ogg編解碼器系列的一部分）維護，後來由互聯網工程任務組（IETF）整合到Opus工作組中。 CELT旨在彌合Vorbis和Speex之間的差距，適用於需要高品質音訊和低延遲的應用。它適用於語音和音樂，藉鑑了CELP算法的想法，但通過專門在頻域中操作避免了它的一些限制。 (zh) Constrained Energy Lapped Transform (CELT) is an open, royalty-free lossy audio compression format and a free software codec with especially low algorithmic delay for use in low-latency audio communication. The algorithms are openly documented and may be used free of software patent restrictions. Development of the format was maintained by the Xiph.Org Foundation (as part of the Ogg codec family) and later coordinated by the Opus working group of the Internet Engineering Task Force (IETF). (en) Constrained-Energy Lapped Transform (CELT; deutsch etwa: überlappende Transformation mit vorgegebener Energie) ist ein (patent-)freies Datenformat/Verfahren zur verlustbehafteten Audiodatenkompression mit besonders niedriger Codec-Latenz, um bei Echtzeit-Anwendungen in der Verarbeitung des typischerweise unmittelbar vor der komprimierten Übertragung erzeugten Signales möglichst wenig Verzögerung (Latenzzeit) zu verursachen. Das Verfahren ist offen dokumentiert und frei von Softwarepatentrestriktionen nutzbar. Es wurde von der Xiph.Org Foundation (als Teil der Ogg-Codec-Familie) und der Codec-Arbeitsgruppe der Internet Engineering Task Force (IETF) entwickelt, ist mittlerweile jedoch in der Weiterentwicklung Opus aufgegangen.Damit ist CELT als eigenständiges Format aufgegeben worden und wir (de)
foaf:name	libcelt (en)
foaf:homepage	https://web.archive.org/web/20110228033837/http:/www.celt-codec.org/
name	CELT (en) libcelt (en)
foaf:depiction
dcterms:subject	Xiph.Org projects Speech codecs Free audio codecs
Wikipage page ID	21663936 (xsd:integer)
Wikipage revision ID	1122661173 (xsd:integer)
Link from a Wikipage to another Wikipage	Sampling rate Xiph.Org projects Vorbis Intellectual property Library (computing) SILK Pulse-code modulation Pyramid vector quantization Low-latency Ekiga Entropy encoding GStreamer Mumble (software) Constant bitrate Critical band MP3 Comfort noise Comparison of audio coding formats Compression artifact Delta encoding Packet loss concealment SPICE (protocol) BSD licenses C (programming language) Transparency (data compression) Data reduction Window function Hearing range Joint encoding Linear prediction Advanced Audio Coding Speech codecs FFmpeg Transform coding Quantization (signal processing) Royalty-free Internet Engineering Task Force JACK Audio Connection Kit TeamSpeak Team Fortress 2 Audio compression (data) Free audio codecs Code-excited linear prediction High-Efficiency Advanced Audio Coding Modified discrete cosine transform Variable bitrate Reference implementation Dota 2 Audio codec Speex FreeSWITCH Free software

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