Perceived Audio Quality in Ogg Vorbis and AAC in Compressed Popular Music in Bit Rates between 96 kbit/s, 128 kbit/s and 192 kbit/s
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
The audio quality in music has proved to be important by a broad audience. Studies show that 67,1 % of young listeners (Olive, 2011) and 72 % of experienced listeners (Pras et al, 2009) can distinguish lossy coded audio from lossless coded audio. Ogg Vorbis and AAC are two common lossy codecs in music streaming services. Factors that impact the perceived audio quality are genre, bit rate, codec and instrument. An ABX test was performed with 20 trained listeners. The excerpts that were tested were three popular songs from 2015 and 2016 coded in AAC and Ogg Vorbis 96 kbit/s, 128 kbit/s and 192 kbit/s. The results showed that the subjects only could hear a difference between uncoded and lossy coded audio for one excerpt coded in AAC 96 kbit/s. This result does not exactly match those of earlier studies where subjects could hear the difference at higher bit rates, but there are still some similarities. This study is too small to come to any conclusions and more research has to be done on these codecs. The music streaming services that use these codecs already use higher bit rates than these that were tested so the quality is already good enough.
Place, publisher, year, edition, pages
2016. , 34 p.
Teknik, Ljudteknik, snålkodning, AAC, Ogg Vorbis, Lossy coding, advanced audio coding, bit reduction
IdentifiersURN: urn:nbn:se:ltu:diva-57222Local ID: de905b01-dec3-4f4b-9bb9-e4fa04125e54OAI: oai:DiVA.org:ltu-57222DiVA: diva2:1030609
Subject / course
Student thesis, at least 15 credits
Audio Technology, bachelor's level
Validerat; 20160531 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved