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Author:Sundvall, Mika
Title:Opus Audio Codec in Mobile Networks
Opus audiokoodekki matkapuhelinverkoissa
Publication type:Master's thesis
Publication year:2014
Pages:viii + 74      Language:   eng
Department/School:Signaalinkäsittelyn ja akustiikan laitos
Main subject:Akustiikka ja äänenkäsittely   (S3004)
Supervisor:Välimäki, Vesa
Instructor:Suvanen, Jyri
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201501031006
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  2668   | Archive
Keywords:speech codecs
transcoding
digital signal processing
software testing
digital signal processors
microprocessors
puhekoodekit
transkoodaus
digitaalinen signaalinkäsittely
ohjelmistotestaus
digitaaliset signaaliprosessorit
mikroprosessorit
Abstract (eng):The latest generations in mobile networks have enabled a possibility to include high quality audio coding in data transmission.
On the other hand, an on-going effort to move the audio signal processing from dedicated hardware to data centers with generalized hardware introduces a challenge of providing enough computational power needed by the virtualized network elements.

This thesis evaluates the usage of a modern hybrid audio codec called Opus in a virtualized network element.
It is performed by integrating the codec, testing it for functionality and performance on a general purpose processor, as well as evaluating the performance in comparison to the digital signal processor's performance.
Functional testing showed that the codec was integrated successfully and bit compliance with the Opus standard was met.

The performance results showed that although the digital signal processor computes the encoder's algorithms with less clock cycles, related to the processor's whole capacity the general purpose processor performs more efficiently due to higher clock frequency.
For the decoder this was even clearer, when the generic hardware spends on average less clock cycles for performing the algorithms.
Abstract (fin):Uusimmat sukupolvet matkapuhelinverkoissa mahdollistavat korkealaatuisen audiokoodauksen tiedonsiirrossa.
Toisaalta audiosignaalinkäsittelyn siirtäminen sovelluskohtaisesta laitteistosta keskitettyjen palvelinkeskusten yleiskäyttöiseen laitteistoon on käynnissä, mikä aiheuttaa haasteita tarjota riittävästi laskennallista tehoa virtualisoituja verkkoelementtejä varten.

Tämä diplomityö arvioi modernin hybridikoodekin, Opuksen, käyttöä virtualisoidussa verkkoelementissä.
Se on toteutettu integroimalla koodekki, testaamalla funktionaalisuutta ja suorituskykyä yleiskäyttöisellä prosessorilla sekä arvioimalla suorituskykyä verrattuna digitaalisen signaaliprosessorin suorituskykyyn.
Funktionaalinen testaus osoitti että koodekki oli integroitu onnistuneesti ja että bittitason yhdenmukaisuus Opuksen standardin kanssa saavutettiin.

Suorituskyvyn testitulokset osoittivat, että vaikka enkoodaus tuotti vähemmän kellojaksoja digitaalisella signaaliprosessorilla, yleiskäyttöinen prosessori suoriutuu tehokkaammin suhteutettuna prosessorin kokonaiskapasiteettiin korkeamman kellotaajuuden ansiosta.
Dekooderilla tämä näkyi vielä selkeämmin, sillä yleiskäyttöinen prosessori kulutti keskimäärin vähemmän kellojaksoja algoritmien suorittamiseen.
ED:2015-01-18
INSSI record number: 50405
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