[vorbis] Low bitrate encoding

[Monty]

> I'm not a signal proc. exprert at all but I think that averaging will
> still give higher quality than discarding half of the samples, without
> serious performance difference.  Discarding shold create strong
> alising problems.  Averaging is a downpass filter, surely not ideal
> but it should help somewhat.

No, both are equivalent operations, and both fold the frequency
spectrum over itself and cause aliasing.

You *must* lowpass, then downsample, or perform an optimized algorithm
that is equivalent.

Go read about it before taking this discussion any further please.

Monty

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