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by maep
830 days ago
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If used in a small device like a hearing aid, a 2x factor can have a significant impact on battery life. VoIP in general experiences full packet loss, meaing if a single bit flips the entire packet is dropped. For radio links like Bluetooth it's possible to deal with some bit flips without throwing the entire packat away. Until 1.5 Opus PLC was in my opinion it's biggest weakness, compared to other speech codecs like G.711 or G.722. A high compression ratio causes bit flips to be much more destructive. As for making moeny, Bluetooth codecs have no license fees. |
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Opus was intentionally designed so that the most important bits are in the front of the packet, which can be better protected by your modulation scheme (or simple FEC on the first few bits). See slide 46 of https://people.xiph.org/~tterribe/pubs/lca2009/celt.pdf#page... for some early results on the position-dependence of quality loss due to bit errors.
It is obviously never going to be as robust as G.711, but it is not hopeless, either.