Our eyes are equipped with three different color sensitive cells called cones. Perception of color is created in our brains by comparison of the responses from different cone cells.
The Colorophone sonification method is inspired by the human visual system. Three basic colors red, green and blue, which correspond to three different frequencies of the light wave, are associated with three different sound frequencies. Blue is associated with the lowest frequency, green with the middle frequency and red with the highest frequency. The perceived intensities of sound for particular sound frequencies are corresponding to perceived light intensities for basic RGB color components. If all three color components are present in the light, which will result in the perception of whiteness, the generated sound signal is filled up with the white noise.
As the result we receive a sound which is easy to interpret, composed of maximum three different components. With continuous change of the RGB color components the auditory signal also changes continuously.