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reduction of quantization noise by taking average of multiple encoded
.alexander.
post Feb 29 2012, 13:53
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Youtube hosts lots of music transcoded using faac and quality isn't great. As popular tracks are usually uploaded by multiple users, one might reduce encoding noise by averaging waveforms of duplicates (can be done either in client app or intermediate server). Noise std should decrease as 1/sqrt(N:). Do you guys think this would work?
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pdq
post Feb 29 2012, 15:31
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1/sqrt(N:) only applies to uncorrelated noise. I suspect that a lot of the noise added by lossy encoding is not entirely uncorrelated.

I hope this question is of a purely academic nature, because of course the right answer is if you want the music then buy your own copy.
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