RCS sounds are generated with randomly modulated chords that are assigned a binaural correlation pattern between the left and right audio channels. These sounds are conceptually analogous to random-dot stereogram (RDS) images first developed by Dr. Bela Julesz in 1959 (commercially available as Magic Eyes (c)), in which left and right eye correlations produce a visual pop-out phenomena. The figure above illustrates the random envelope pattern and the left-right ear correlations in a sample RCS responsible for the perceived binaural grouping phenomena. Note that the red regions have a correlation of 1 (identical spectrotemporal envelope) between the left and right audio channels. The blue regions are statistically independent (zero correlation). When listening to this sound you will hear the percept of a beatingn noise pattern which "pops-out" above the background noise. By applying the same principle we are able to generate a variety of acoustic percepts. Below are examples correlation maps that we can adjust in order to generate a variety of moving ripple percepts (we call these Virtual Ripples or simply VR).

The VR sounds below are converted to MP3 fomat at the cost of minimal perceptual degredation. Each image shows the binaural correlation pattern for each VR sound. Click on each of the correlation images below to download the corresponding VR. You may download all sounds in their original WAV format through the link below (zip format).

To hear the uncorrelate control sound click here

To hear example VR sounds click images below.

Download all in WAV format

Listening Instructions

● Make sure you use isolated audio headphones. The left and right audio channel should be independent in order to create a proper binaural image.