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Distinguishing between lossless and lossy
post Apr 27 2012, 11:44
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I would like to ask a question about lossless audio. How can you distinguish between a lossless song and one which has just been converted into a lossless format but isnít actually lossless.

From what I understand you have to use a spectrum analyzer, but that is the extent of what I understand.

Thank you so much in advance wink.gif
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post Apr 28 2012, 02:10
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Besides a sharp cutoff, lossy encodes also have the upper spectrum in large, unmistakable chunks, that are encoded only when the signal is above a certain threshold, and rapidly appear and disappear during playback. Otherwise the cutoff is even lower. This screenshot shows a 320 kBit/s high quality MP3. Notice the missing chunk near 16k.


Even after moderate processing, such as a radio transmission, MP3 files can be recognized by this anomaly from streams that have merely been band-limited with a sharp digital filter.
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