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5
GDK_WINDOW_TYPE_HINT_DIALOG
0.1
(c) Commonwealth Scientific and Industrial Research Organisation (CSIRO)
This is a tool to perform MUSHRA test. It attempts to follow recommendation ITU-R BS.1534-1 as closely as possible, but we cannot guarantee that it fully complies with the recommendation.
http://rateit.sourceforge.net/
This software is licensed under the GNU General Public License (GPL) version 2 or later OR (at your choice) under the Mozilla Public License (MPL) version 1.1
Jean-Marc Valin
translator-credits
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1 Familiarization or training phase
The first step in the listening tests is to become familiar with the testing process. This phase is called a training phase and it precedes the formal evaluation phase.
The purpose of the training phase is to allow you, as an evaluator, to achieve two objectives as follows:
– Part A: to become familiar with all the sound excerpts under test and their quality level ranges; and
– Part B: to learn how to use the test equipment and the grading scale.
In Part A of the training phase you will be able to listen to all sound excerpts that have been selected for the tests in order to illustrate the whole range of possible qualities. The sound items, which you will listen to, will be more or less critical depending on the bit rate and other “conditions” used. You may click on different buttons to listen to different sound excerpts including the reference excerpts. In this way you can learn to appreciate a range of different levels of quality for different programme items. The excerpts are grouped on the basis of common conditions.
In Part B of the training phase you will learn to use the available playback and scoring equipment that will be used to evaluate the quality of the sound excerpts.
During the training phase you should be able to learn how you, as an individual, interpret the audible impairments in terms of the grading scale. You should not discuss your personal interpretation of the scale with the other subjects at any time during the training phase. However you are encouraged to explain artefacts to other subjects.
No grades given during the training phase will be taken into account in the true tests.
2 Blind grading phase
The purpose of the blind grading phase is to invite you to assign your grades using the quality scale. Your grades should reflect your subjective judgement of the quality level for each of the sound excerpts presented to you. Each trial will contain a certain number of signals to be graded. Each of the items is approximately 10 to 20 s long. You should listen to the reference and all the test conditions by clicking on the respective buttons. You may listen to the signals in any order, any number of times. Use the slider for each signal to indicate your opinion of its quality. When you are satisfied with your grading of all signals you should click on the “register scores” button at the bottom of the screen.
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GTK_PACK_END