There are many different possible representations of sounds. Some representations sound different from the original recording, depending on the model. The mp3 compression is a popular example of a lossy encoding that may sound different from the original. One important aspect of sound representations is the perceptual similarity between the original sound and its representation.
In this listening test you will be asked to compare the perceptual similarity between the original recording and a representation for musical instrument sounds. Below, you will find a table with 20 lines. Each line contains
- the original sound;
- the model.
For each line of the table, you will hear two sounds. The original recording and the model.
Listen once to all the sounds to get used to the range of differences between them. Only after listening to all of the sounds once should you start the test.
When we judge the perceptual similarity of sounds, we are trying to assess how close the sounds are on the perceptual plane. In other words, we want to determine if they sound the same or different. Naturally, when they sound different we can additionally judge how different, just a little or a lot.
Your task is to listen to the original sound and to the model and rate their perceptual similarity using the scale given
- slightly different;
- fairly different;
- significantly different;
- very different.
Before taking the test, listen once to all the sounds to get used to the range of differences
- Check that the Flash plugin works correctly and the sound level is properly set;
- Use headphones;
- Do the test in a quiet place;
- Before running the test, do not hesitate to send me an e-mail if you have questions.
Thank you for participating! This experiment won't take you more than 5 minutes.