That demo IS interesting !! the HF extension a bit like the extensions uses in MPEG4 AAC-PLUS.. but the AAC version is I understand quite basic in its method.
I've only ever heard it on music. It's quite convincing, at least on a small speaker in a non critical listening environment. There is a huge intelligibility improvement getting speech to 4.5kHz from 3 , a bit more to 5 kHz, I think diminishing returns after 5.5... But rather than synthesing a high end, I would think encoding the HF/ sibilant information would be more rewarding. We only want out to ~ 5.5kHz. maybe just noise on/ noise off encoded by a couple of bits of amplitude. -glen On 27/06/2017 7:18 AM, David Rowe wrote: > Thanks Ricardo, > > The demo was interesting, some high frequency reconstruction. I > wonder if they mean "kHz" in the article rather than "kbps) when they > referred to down sampling. The banner at the bottom made reading the > article really annoying. > > As it happens I playing with some similar ideas right now. Speech > does have some correlation across the frequency axis. So if you know > one p ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
