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why can perceptually-based coding offer better audio compression than basic PCM coding? Why does nonlinear PCM coding work better than Linear PCM for audio compression?

why can perceptually-based coding offer better audio compression than basic PCM coding? Why does nonlinear PCM coding work better than Linear PCM for audio compression? Why can DPCM coding with Exponential-difference-values provide a more flexible way for audio compression?

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