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16.1. General Aspects

This section addresses some general aspects related to any listening test, including the criteria and procedure to select the test material and the test subjects, the definition of the laboratory setup, the specification of the test plan, and the procedures to train the subjects before the test.

16.1.1. Selection of Test Material

MPEG has gathered a large library of audio excerpts to be used for developing and testing its standards [M3598]. During the preparation of the verification tests, whenever the experts recognized a lack of suitable material, either in terms of the type of content or in terms of the level of criticality, they issued a call for new test material [N2168], specifying the desired characteristics. In this way, a considerable number of excerpts were collected after each call. To identify the items to be used in the tests, a two-step selection was performed. First, the audio experts listened to the source material to eliminate the content that was not relevant for the test or that was a priori considered either too critical or too simple regarding its encoding. Then, the excerpts were encoded with the codecs under test, and the experts made a blind selection of the material based on some predefined criteria, including criticality, type of content, some characteristics of the signals, and type of use.


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