> Panned stereo mode!
>
> For each frame you examine a spectrally weighed (ignore low freqs) energy
> ratio of left/right to pick the stereo panning at two points in time
> (middle, and right) then interpoate from old_left to middle then right,
> enforcing a maximum rate of change.
>
> Then mix to mono, encode as mid, and the position as side, you only have
> to encode lower scalfactors because it should consist of low freqs only
> (because of your slow interpolation). I suppose you could shape your side
> wav to MDCT well too..
>
> Am I missing something?
>
> I'd think that this would allow you to get mono quality at about the same
> bitrate, but still preserve panning which would be help at differentiating
> between people speaking.
According to me, this can't be done using m/s stereo, because in the case of
someone speaking on side, the side channel would be as high as the middle
channel.
What you're describing here looks lot like the intensity stereo mode, where
the signal is encoded as mono on the left channel, and location is encoded
on the right one. This would help a lot voice encoding, but also music at
low bitrates. To my mind, it's something missing to Lame in order to be able
to compete FhG at low bitrates.
Unfortunately, it's unlikely that I'll have the time to work on this. As it
does not seems to be much difficult to make (at least it's easier than m/s
stereo), perhaps Patrick could allow some of his students to work on this. I
can't do it during my own student project, as mine must be about image
processing or image synthesis.
Regards,
Gabriel Bouvigne - France
[EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3tech.org
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