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There is a cut and dry relationship between bitrate and audio fidelity. You simply cannot encode higher frequency audio in lower bitrate samples. https://en.wi
by eggsby 6y ago
There is a cut and dry relationship between bitrate and audio fidelity. You simply cannot encode higher frequency audio in lower bitrate samples.
https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampli...
- gltchkrft 6y agoYes, but for most codecs, bitrate is variable. For the parts where the higher frequencies are present the codec is free to bump up the bitrate and it can also scale it down for silent parts or parts with low frequencies only.
- lolpython 6y agoSure, if it were encoded at a variable rate. But then it wouldn’t be 320kbps CBR. Normally when I see people refer to 320kbps audio they literally mean constant bitrate. If it’s variable then for LAME mp3 people would specify V0 or V2. At least that’s the taxonomy that I absorbed when I was active on what.cd Edit: you have edited your comment to remove mention of 320kbps so my comment is now moot :)
- Mindless2112 6y agoNyquist is about sample rate and frequency, not bitrate and frequency. Edit: Clearly there is generally a relationship between bitrate and quality, but for compressed audio it is far from "cut and dry".
- gruez 6y agoThat's irrelevant because human ears aren't spectrum analyzers. Audio compression codecs exploit weakness in human perception[1] to discard data with minimal loss of subjective audio quality. [1] https://en.wikipedia.org/wiki/Psychoacoustics https://en.wikipedia.org/wiki/Psychoacoustics
- CarelessExpert 6y agoToo bad we have that pesky brain in the way. Human perception isn't just a matter of signal processing theory.