[vorbis] RC2 worse than RC1 and Beta4

[Monty]

On Wed, Aug 15, 2001 at 07:39:15PM -0400, thobois at mindspring.com wrote:

> The 16kHz low-pass on the RC2 encoder makes it sound like FM radio. 

You will be free to turn it off soon;  lowpass will be user configurable.

Personally, I find the least bit of high end instability (swishiness)
to be far more objectionable to a lowpass.  You'd likely never hear
the swishiness on speakers, but on good cans, it's more obvious.  Thus
the decision to make the audio <16kHz rock solid as opposed to trying
hard to encode the whole range.

A number of rc2 users find 64kbps quite good.  Even though it's my own
software, I find it nearly unlistenable (but still better than WMA
;-)

Anyway, that's my rationale, and my own specific subjective coloration
that led to the decision for a 16kHz lowpass at 128.  It's not
necessary, I just like it better.

> Both 
> encoders SEEM to have a couple of dB bump at 10kHz.

Not quite.  You'll see a slight bump in rc2 at about 11kHz due to
unnormalized point stereo.  b4 did not perform coupling.

Monty

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