[vorbis-dev] idea for a new algorithm

[Sirko Zidlewitz]

Hello vorbis developer!

I'm not very experienced in informatics, cause i'm only an audio
engineer and sorry for my broken english but i have an idea...

After the filterbank the maximum aplitude in each band decides
about the nessesary bits, then the psychoacoustic model decides how
much of the signal can be truncated without hearable noise.

What do you think about quantising the remaining bits nonlinear
with a logarithmic scale? This would share 25%.

Nonlinear quantisation is used for instance in a-law or for the
longplay-mode of DAT-recorders.

The disadvantages of nonlinear quantisation will not apply here,
because the 576 frequency bands are too narrow. The harmonics
of the square waves are outside these bands and will be filtered
out by the filterbank on the player side.

The Result would be a better resolution on low amplitudes.
The quantising noise on high levels would be masked thru the
signal itself.

I know, this is not MPEG-compatible in any way.
Anyway what do you think? Would it work?
-----------------------------------------------------------------
Sirko Zidlewitz sirko at track4.de
Recording Studio track4 Tel:+49-3381-3159052 Fax:+49-3381-3159054
Magdeburger Str. 15, 14770 Brandenburg a.d. Havel, Germany

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