[vorbis] just an idea about quality evaluation

[Stoffke]

Hello 

I had an idea about judging the quality of ogg vorbis 
(or any other lossy codec)

I took a wave-file and encoded it to ogg.
Then decoded ogg to wav and inverted it's phase. When mixing the original
wav with the phase-inverted decoded ogg-file, any identic parts of compressed and uncompressed audio should be eliminated. 
Of course there's always a "rest" of sound because the encoder is not lossless.
Could this "rest" be an indicator for the quality of the encoder ?

I know that evaluating the quality of a perceptual encoder with any technical equipment is nearly impossible and it would be better to let the  ear do this.
But I'd like to know what you think about this idea .

Greetings
Stoffke

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