| Popis: |
Diplomsko delo obravnava zvočni kodek Opus in vpliv omrežnih degradacij na kakovost zvoka. Namen dela je analizirati kakovost zvočnih posnetkov, kodiranih s kodekom Opus in poškodovanih s simulirano degradacijo omrežja na osnovi izgube paketov. V teoretičnem delu naloge so opisani zvočni kodeki in predstavljene objektivne metode za vrednotenje kakovosti zvoka. V praktičnem delu je razvit in implementiran postopek za primerjavo kakovosti zvočnih posnetkov, ki temelji na velikem številu ponovitev eksperimentov. Izvedeno je vrednotenje kakovosti realnih vhodnih posnetkov pri različnem deležu izgubljenih paketov v omrežju, pri čemer je uporabljena metoda za objektivno zaznavno ocenjevanje kakovosti govora ITU P.862 PESQ. This bachelor`s thesis addresses Opus audio codec and the effect of network degradation on the speech quality. The objective of this work is to analyze the quality of audio recordings, encoded with Opus audio codec and degradated, at different levels of network degradation. In the theoretical part of the thesis, the audio codecs description is given along with the explanation of methods for speech quality assessment. In the experimental part, a procedure for comparing speech quality based on the result of mean opinion score is developed and implemented. Finally, the analysis of audio quality for multiple input recordings is performed at different packet loss ratios in the network, using the ITU P.862 PESQ objective perceptual speech quality assessment method. |
