At worst, it introduces artifacts which worsens the perceived audio quality, compared to not using it at all.
Results of listening tests like these, show that there's some average bitrate above which things like parametric stereo at best yield no difference to not using it. (HE-AAC) profiles: MPEG-2 AAC Low Complexity (LC) profile (multichannel). If you want to see some results of those kind of tests, I suggest you search for "MUSHRA HE-AAC test" (I don't want to plagiarize or hard-link them here) and the likes. Sign Up for more Advanced settings (optional) Audio Options Audio Codec Choose. Above a certain level, which depends on the audio and the capacity allotted to the compressor, those additional algorithms, fail to produce any increase in perceived in audio quality. However, things like Spectral-Band-Replication or Parametric Stereo only yield better results, if the compressed capacity is already quite constrained. AAC-LC (low complexity) is the most widely used coding profile in this standard, and the default format for Apples iTunes. Note that AAC-LC is technically the baseline encoding system, and algorithms are added to that, to increase compression efficiency while making compression and decompression more complex. It features unprecedented device compatibility with virtually all browsers. There are two pictures on the Wikipedia page of AAC, which I think are quite helpful: Advanced Audio Coding (AAC) represents the state of the art in audio encoding.
0 kommentar(er)
