Shepard tone - WikipediaA spectrum view of ascending Shepard tones on a linear frequency scale A Shepard tone, named after Roger Shepard, is a sound consisting of a superposition of sine waves separated by octaves. When played with the bass pitch of the tone moving upward or downward, it is referred to as the Shepard scale. This creates the auditory illusion of a tone that seems to continually ascend or descend in pitch,
シェパード音階 AMAZING Audio Illusion Video
