Anamanaguchi presents Dawn Metropolis. Shepard tone. Spectrum view of ascending Shepard tones (linear frequency scale) Construction[edit] Figure 1: Shepard tones forming a Shepard scale, illustrated in a sequencer Each square in the figure indicates a tone, any set of squares in vertical alignment together making one Shepard tone. The color of each square indicates the loudness of the note, with purple being the quietest and green the loudest. Overlapping notes that play at the same time are exactly one octave apart, and each scale fades in and fades out so that hearing the beginning or end of any given scale is impossible. As a conceptual example of an ascending Shepard scale, the first tone could be an almost inaudible C(4) (middle C) and a loud C(5) (an octave higher).
The next would be a slightly louder C#(4) and a slightly quieter C#(5); the next would be a still louder D(4) and a still quieter D(5). The acoustical illusion can be constructed by creating a series of overlapping ascending or descending scales. The tritone paradox[edit] NOW PLAYING: CitySounds.fm - The music of cities. Howlin' Wolf - Spoonful (1960) Video explains the world's most important 6-sec drum loop. Index.