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The sound of perceptual transparency?

andhar (194607) writes | more than 5 years ago

Music 1

andhar (194607) writes "I hate audiophile audio and mp3 audio almost equally, though for different reasons. I was sitting contemplating lossy audio compression and the concept that you can throw away data and have the result be perceived just like the original — perceptual transparency. I then wondered to myself, is there a sound of the data thrown away? I.e. the sound of that which is not perceived.

Does anyone know how this would be calculated or even if there are any examples of this posted on the interwebs somewhere?"

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Inverse filter? (1)

Skinkie (815924) | more than 5 years ago | (#26866981)

If you want to know what your mp3 encoder thinks you cannot hear you have to make an inverse filter. This is done by the original file and the newly created file and results a filter characteristic. If your intention is just to hear what you lost, you could subtract the newly created signal from your old signal but this is only a differential and not really telling you what lacks only how the filter/encoder performed. If you want to toy with this, I suggest go to, and download a nifty program that can give you a toolbox for manipulation of audio. Basically any codec works based on a psycho-acoustic model that makes some assumptions on what you spectral wise is your brain can distinguish for one sample interval. Since your membranes are not the only thing in your body that absorb soundwaves that is only one part of the equation ;) But rather makes it more simple.
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