A non-invasive method of audio file identification is described to ascertain the proximity of processed audio, of possibly dubious origin, to a reference file. A differential correlation function forms the basis of a comparative metric. Testing embraces linear and non-linear processes including perceptual based codecs. Applications include DVD_A and SACD when used as the only legitimate non-watermarked release formats.
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https://aes2.org/publications/elibrary-page/?id=9837
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