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Author:Pakarinen, Antti
Title:Multi-core platforms for audio and multimedia coding algorithms in telecommunications
Moniydinsuorittimet audion ja multimedian koodausalgoritmeille tietoliikenteessä
Publication type:Master's thesis
Publication year:2012
Pages:[9] + 63      Language:   eng
Department/School:Signaalinkäsittelyn ja akustiikan laitos
Main subject:Akustiikka ja äänenkäsittelytekniikka   (S-89)
Supervisor:Välimäki, Vesa
Instructor:Pekonen, Jussi
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201212083430
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  1266   | Archive
Keywords:multimedia
coding algorithms
multicore
multimedia
audio
video
koodausalgoritmit
moniydin
Abstract (eng): Multimedia coding algorithms used in telecommunications evolve constantly.
Benefits and properties of two new hybrid audio codecs (USAC, Opus) were reviewed on a high level as a literature study.
It was found that both have succeeded well in subjective sound quality measurements.
Tilera TILEPro64-multicore platform and a related software library was evaluated in terms of performance in multimedia coding.

The performance in video coding was found to increase with the number of processing cores up to a certain point.
With the tested audio codecs, increasing the number of cores did not increase coding performance.
Additionally, multicore products of Tilera, Texas Instruments and Freescale were compared.
Development tools of all three vendors were found to have similar features, despite the differences in hardware architectures.
Abstract (fin): Tietoliikenteessä käytettävät multimedian koodausalgoritmit eli koodekit kehittyvät jatkuvasti.
USAC ja Opus ovat uusia, sekä puheelle että musiikille soveltuvia audiokoodekkeja.
Molemmat ovat sijoittuneet korkealle koodekkien äänenlaatua vertailevissa tutkimuksissa.
Näiden keskeisiä ominaisuuksia käsitellään kirjallisuuskatsaukseen perustuen.
Varsinkin HD-tasoisen videon käsittelyssä käytettävät koodekit vaativat suurta laskentatehoa.
Tilera TILEPro64 -moniydinsuorittimen ja sille optimoitujen multimediakoodekkien suorituskykyä testattiin tarkoitukseen suunnitelluilla tietokoneohjelmilla.

Tulokset osoittivat, että suoritinytimiä lisättäessä videon koodausalgoritmien suoritusnopeus kasvaa tiettyyn rajaan asti.
Testatuilla äänen koodausalgoritmeillä ytimien lisääminen ei parantanut suoritusnopeutta.
Tileran moniydinratkaisuja verrattiin lopuksi Freescalen ja Texas Instrumentsin moniydinratkaisuihin.
Huolimatta eroista laitteistoarkkitehtuureissa, kyseisten toimittajien kehitystyökaluissa todettiin olevan paljon samoja piirteitä.
ED:2012-11-23
INSSI record number: 45428
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