Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Ravelli, Emmanuel"'
Autor:
Ravelli, Emmanuel
Cette thèse étudie de nouvelles techniques de représentation du signal pour le codage audio. Les codeurs audio existants sont basés soit sur une transformée (codage par transformée), soit sur un modèle paramétrique (codage paramétrique), soi
Externí odkaz:
http://tel.archives-ouvertes.fr/tel-00812570
http://tel.archives-ouvertes.fr/docs/00/81/25/70/PDF/manuscrit.pdf
http://tel.archives-ouvertes.fr/docs/00/81/25/70/PDF/manuscrit.pdf
Publikováno v:
GlobalSIP
At low bit-rates, speech coders relying on a single source model have difficulties to properly render speech and background noise simultaneously. Difficulties can get even bigger when using speech enhancement techniques within the coding scheme: thes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0e342822aeffe7b0334398527f299a82
https://doi.org/10.1109/globalsip.2015.7418245
https://doi.org/10.1109/globalsip.2015.7418245
Autor:
Stephan Wilde, Stefan Dohla, Guillaume Fuchs, Dietz Martin, Ravelli Emmanuel, Anthony Lombard
Publikováno v:
ICASSP
Discontinuous Transmission (DTX) is an efficient way to drastically reduce the transmission rate of a communication codec in the absence of voice input. In this mode, most frames that are determined to consist of background noise only are dropped fro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::485383499aff345a740c4a2f827a89df
https://doi.org/10.1109/icassp.2015.7179102
https://doi.org/10.1109/icassp.2015.7179102
Publikováno v:
ICASSP
Several state-of-the-art switched audio codecs employ the closed-loop mode decision to select the best coding mode at every frame. The closed-loop mode selection is known to have good performance but also high complexity. The new approach we propose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59011186086d93e68b2e2684280dd498
https://doi.org/10.1109/icassp.2015.7179101
https://doi.org/10.1109/icassp.2015.7179101
Autor:
Christian Helmrich, Goran Markovic, Ravelli Emmanuel, Takehiro Moriya, Matthias Neusinger, Guillaume Fuchs
Publikováno v:
ICASSP
Speech coders operating in time domain can be extended with a frequency domain mode to improve encoding of music, even though this is challenging at low delay. In such a scenario, the short analysis window limits the benefit of the transform coder, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::737a99b05366e8b7499d7ac0980667e9
https://doi.org/10.1109/icassp.2015.7179068
https://doi.org/10.1109/icassp.2015.7179068
Current scalable audio coders typically optimize performance at a particular layer without regard to impact on other layers, and are thus unable to provide a performance trade-off between different layers. In the particular case of MPEG Scalable Adva
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ad24a706aabdc7fc47382d62034384e
https://publica.fraunhofer.de/handle/publica/231815
https://publica.fraunhofer.de/handle/publica/231815
Publikováno v:
ICASSP
MPEG-4 High-Definition Advanced Audio Coding (HD-AAC) enables scalable-to-lossless (SLS) audio coding with an Advanced Audio Coding (AAC) base layer, and fine-grained enhancements based on the MPEG SLS standard. While the AAC core offers better perce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78e18bd3fbe726895a3ef84ad81cf544
https://doi.org/10.1109/icassp.2010.5495833
https://doi.org/10.1109/icassp.2010.5495833
Publikováno v:
WASPAA
Scalable-to-Lossless (SLS) audio compression, as standardized by MPEG, provides a lossy base layer compatible with the Advanced Audio Coding (AAC) format, ensuring state-of-the-art quality in the base layer, and additional fine grained enhancements t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0593192bb2a5ab492523c3c86f08520
https://doi.org/10.1109/aspaa.2009.5346480
https://doi.org/10.1109/aspaa.2009.5346480
Autor:
Ravelli, Emmanuel
Publikováno v:
Traitement du signal et de l'image [eess.SP]. Université Pierre et Marie Curie-Paris VI, 2008. Français. ⟨NNT : 2008PA066359⟩
This thesis investigates new signal representations for audio coding. Existing state-of-the-art audio coders are based either on a transform (transform coding), or on a parametric model (parametric coding), or on a combination of both (hybrid coding)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::b753c4236a2a98eb41bd9cf62df85594
https://tel.archives-ouvertes.fr/tel-00812570/document
https://tel.archives-ouvertes.fr/tel-00812570/document
Publikováno v:
International Society for Music Information Retrieval Conference (ISMIR)
International Society for Music Information Retrieval Conference (ISMIR), 2008, Philadelphia, United States
International Society for Music Information Retrieval Conference (ISMIR), 2008, Philadelphia, United States
International audience; We consider in this paper sparse audio coding as an alternative to transform audio coding for efficient MIR in the transform domain. We use an existing audio coder based on a sparse representation in a union of MDCT bases, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77c86ee8acf9c207654d065e7843b82a