[vorbis] square polar mapping - backgrounds

[Stoffke]

Hello,

I wanted to find out more about square polar mapping, cause that whole
stuff is a bit tricky  - to me - and not so easy to understand. 
Searching the web did't get me any results, so I wonder what the background 
of square polar mapping is.

Is it derived from some mathematical publications or just the result of a brilliant
intuition of a Vorbis programmer  ? ;)

Thanks.

Stoffke

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