v1.6.0

Octave illusion

Swap two antiphase frequencies between ears so a single tone seems to jump register and side.

npx web-audio-api octave-illusion 400 800 2 12s
low=<hz|note>
frequency or note name in the CLI (default: 400)
high=<hz|note>
frequency or note name in the CLI (default: 800)
rate=<hz>
alternation rate
-d, --duration <time>
run time (CLI accepts s/m/h suffixes; default: 12s)
ready

Other examples

11Shepard toneLayer octave-spaced voices to create a pitch that appears to rise or fall forever.Explore 12Risset rhythmLayer tempo cycles to create a beat that appears to accelerate or decelerate forever.Explore 13Binaural beatsSend nearby frequencies to opposite ears and hear their difference.Explore 14Missing fundamentalPlay harmonics 2–6 while omitting the pitch the listener still perceives.Explore

This renders Deutsch's octave illusion: two antiphase frequencies swap between ears so a single tone seems to jump register and side, an effect that only works over headphones. Hear it in the browser, or render the stereo signal from the Node CLI to study or share it.