How good are you at hearing pitch (frequency) differences?
|50c Up||50c Down||440Hz Flat|
The first audio file plays back a 440 Hz sine tone characterized by a sudden increase in pitch occuring after 1s (50cent in this case). The second file introduces a decrease in pitch by the same amount. The third one is flat.
For better results, use headphones to perform this test. Avoid using multiple speakers (a single speaker is OK) as the relative phase between the speakers will introduce frequency-dependent level changes. These changes in perceived loudness may help you to detect inaudible frequency changes.
|50c Up 50c Down 440Hz Flat|
|Listen to [?] then vote — multiple guesses not allowed (your vote triggers a new draw)|
To pass a blind test, you will need to perform 10 trials at least, obtain a high score and reach a high confidence level: 95% is standard to rate statistical significance. It means that your score outperforms random guesses by 95%. There is still a probability that you just got lucky though, 5%. To reduce such probability to 1%, keep testing until you reached a confidence level of 99%.
To make the test easier, one can use sawtooth tones instead of sine waves: the presence of harmonics in the sawtooth increases our perception of a change in pitch. To switch to the easier sawtooth test, click here.
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