Thanks for your interest in participating in this listening experiment. The overall experiment will roughly take 25 - 35 minutes.

Instructions:

• This experiment consists of 20 test units. In each test unit, a short audio clip ("Original") followed by five time-stretched versions of this audio clip ("Item 1" to "Item 5") are presented. The five items were computed using different time-scale modification algorithms. Please first listen to the "Original" and then to all time-stretched items. Then give a rating of the overall quality of the time-scale modification result for each of the items on a five-point scale ranging from bad to excellent.
• An excellent item should sound as if the original audio clip was performed on a different time-scale.
• Initially, each item will be marked as "not rated". Please take your time to give every item a rating.
• Please use high quality studio headphones and a good soundcard.
• Make sure that you can perform the test in a quiet environment.
• In each test unit, first listen through all items before you do any ratings to get used to the material.
• Try to rate the overall impression of a test item and do not concentrate on single aspects.

Please submit the results to our server. If you enter a name or email adress this would make it easier to contact you if we have further questions.

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Please first listen to the "Original" and then to all time-stretched items. Then give a rating of the overall quality of the time-scale modification result for each of the items. An excellent item should sound as if the original audio clip was performed on a different time-scale.

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