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actice
2000 Dec 03
4
Low bitrate high-band coding...
...the
whole 11-22 kHz band with around 1000 bits/s per channel (maybe even 500 bps).
Now, I don't know what is the normal bit-rate allocated for this band, but I
expect it is greater than that. Am I right? (can anyone give me numbers for
this?)
The technique I use to do this is inspired from an acticle I published recently
(http://panoramix.dyndns.org/jm/scw2000.pdf) and is based on the fact that at
these frequencies, the ear is totally insensitive to the spectral fine
structure. The processing also has relativly low complexity (most of it is two
LPC analysis in the encoder and one in the decoder...