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Selection of Audio Stimuli for Listening Tests
Two listening test methods in common use for the subjective assessment of audio quality are the ITU-R recommendations BS.1116 for small impairments and BS.1534 (MUSHRA) for intermediate quality. They stipulate the usage of only critical audio stimuli (BS.1116) to reveal differences among systems under test, or critical audio stimuli which represents typical audio material in a specific application context (MUSHRA). An elaboration of the notion critical would be beneficial as a basis for an explicit systematic procedure for the selection of audio stimuli. The selection work is time-consuming, and a poor selection can cause experimental insensitivity and introduce bias. This paper reviews and discusses the selection of audio stimuli in listening test-related studies.
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