[vorbis-dev] Some very early RC1 results

[Gian-Carlo Pascutto]

----- Original Message ----- 
From: "Monty" <xiphmont at xiph.org>
To: <vorbis-dev at xiph.org>
Sent: Sunday, July 15, 2001 5:50 AM
Subject: Re: [vorbis-dev] Some very early RC1 results

> Actually, what I think you're describing is that hiss from across the
> stereo image is being moved/concentrated in the center by the >4kHz
> point stereo.  In the process of doing so, the encoder is not
> accounting for the increase in noise energy because the polar mapping
> isn't circular (an energy of .5 is becoming a total energy of 1. when
> the hiss is centered).  Both aspects of the problem can be controlled,
> the current encoder doesn't try.
> 
> Does that sound about like what you're hearing?

I think so. You should be able to verify it yourself quite easily
because it is very noticable and occurs on lots of samples.

I am wondering how the fact that you use square polar coordinates
affects this problem. I have to admit I don't understand the explanation
100% :(


-- 
GCP

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