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Can highpass and lowpass filtering music before MP3 encoding improve perceived audio quality?
Luleå University of Technology, Department of Arts, Communication and Education.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Distribution of music files often include performing MP3 encoding, especially when utilizing streaming services. Lossy encoding is susceptible to create audible artifacts in the encoded audio material, especially in the high frequency area. To explore highpass and lowpass filtering music as potential adaptation methods to the end media, a listening test was projected where nineteen subjects were exposed to four different adapted MP3 files and one reference MP3 file, at two different bitrates, and were instructed to grade the audio quality of each. Multiple t-testing showed little difference regarding bitrates, why continued analyses were performed on the combined material. Generally, it was found that the reference stimuli scored the highest why it is concluded that highpass and lowpass filtering had a subjectively negative effect on the audio material and that non-filtered MP3 files are favorable to filtered MP3 files. The filtering was found to have some effect in the overall frequency spectrum, however inconclusive.

Place, publisher, year, edition, pages
2017. , 31 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-63638OAI: oai:DiVA.org:ltu-63638DiVA: diva2:1104324
Educational program
Audio Technology, bachelor's level
Supervisors
Examiners
Available from: 2017-06-15 Created: 2017-06-01 Last updated: 2017-06-15Bibliographically approved

Open Access in DiVA

fulltext(1731 kB)9 downloads
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf