> HD Voice (g.722.2 AMR-Wide Band) has a much larger frequency pass band, and sounds much better than GSM or OPUS or most of these other low bandwidth codecs.
At what bitrate, for the comparison to Opus?
And is this Opus using LACE/NoLACE as introduced in version 1.5?
...and is Meta using it in their comparison? It makes a huge difference.
Yeah, I probably shouldn't have included Opus; I'm past the edit window or I'd remove it with a note. I haven't done enough comparison with Opus to really declare that part, and I don't think the circumstances were even. But I'm guessing the good HD Voice calls are at full bandwidth of ~ 24 kbps, and I'm comparing with a product that was said to be using opus at 20 kbps. Opus at 32kbps sounds pretty reasonable. And carrier supported HD voice probably has prioritization and other things going on that mean less loss and probably less jitter. Really the big issue my ear has with Opus is when there's loss.
I don't think I've been on calls with Opus 1.5 with lace/no-lace, released 3 months ago, so no, I haven't compared it with HD voice that my carrier deployed a decade ago. Seems a reasonable thing for Meta to test with, but it might be too new to be included in their comparison as well.
> Really the big issue my ear has with Opus is when there's loss.
That would definitely complicate things. Going by the test results that got cited on Wikipedia, Opus has an advantage at 20-24, but that's easy enough to overwhelm.
And the Opus encoder got some other major improvements up through 2018, so I'd be interested in updated charts.
Oh and 1.5 also adds a better packet loss mechanism.
At what bitrate, for the comparison to Opus?
And is this Opus using LACE/NoLACE as introduced in version 1.5?
...and is Meta using it in their comparison? It makes a huge difference.