Inaudible impairments of impairments near the threshold of audibility require a new method to assess the quality. A variable amplification of the impairments to provide the detection can be realized with the help of the difference signal. In a large listening test, the coding margin for 14 test items was measured. A time varying filter bank to modify the difference signal and to enhance the listening conditions is described.
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https://aes2.org/publications/elibrary-page/?id=7362
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