As Tomas suggests, I have been working on a wideband mode:
http://www.rowetel.com/?p=5711
I'm currently using a 2D DCT approach (bit like JPG) to code a version
of the spectrum. VQ could also be used.
We don't really need to reg-generate the upper 4kHz as it doesn't take
many bits to encode it faithfully (perhaps 20% more than the first
4kHz). The log(f) response of the ear means there isn't much info there
we can actually perceive.
- David
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