>
> TwinVQ is recommended by MPEG for bitrates of 6 Kbits/s where it showed
> performance of 8 Kbits/s MP3 - for higher bitrates TwinVQ might be worse
> (and it is, usually) than MP3.
>
The target of TwinVQ are bitrates between 24 and 64 kbit/s, not 6...8 kbit/s.
This very low bitrate range is target for CELP and other parametric codecs,
not for transformation based codecs.
Also note that at such low bitrate the task is not to transmit audio, but
human voice, and it should be still possible to understand the human voice.
It can be sound fully different from the original, but it must be possible
to understand it.
5 kbps: CELP
25 kbps: MPEG-2 AAC + SBR (MPEG-4 should be a little bit better)
64 kbps: MPEG-2 Layer 3 + SBR
96 kbps: MPEG-4 AAC MP
--
Frank Klemm
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