Audio Test

The following files are a test of whether we can hear phase inversion if two signals, 180° out of phase, are fed to separate ears. All are a 1 kHz stereo sine wave tone, 10 seconds long, but in some of them one channel is inverted. Listen to all of them only through headphones—the inverted files should be audibly different if you listen to them through a speaker, because each ear will hear both channels interfering with each other, but if the channels are kept separate from each other via headphones, where the left channel only goes into the left ear and the right channel only goes into the right ear, you'll be testing whether your brain can perceive the differing phase.

Listen to each, and try to see if you can separate them into two different groups. Make sure you pause each one before listening to the next, because otherwise things will get really crazy as you hear two samples simultaneously. Write down which ones are in which group, then click the link at the bottom to see which samples have the channels 180° out of phase with each other.

No peeking at the source code.

Test Signal 1
Test Signal 2
Test Signal 3
Test Signal 4
Test Signal 5
Test Signal 6
Test Signal 7
Test Signal 8
Test Signal 9
Test Signal 10

To see which test signals are which, click here.