Graphical sound or
drawn sound (Fr.
son dessiné, Ger.
graphische Tonerzeugung,; It.
suono disegnato) is a sound recording created from images drawn directly onto film or paper that were then played back using a sound system. There are several different techniques depending on the technology employed, but all are a consequence of the
sound-on-film technology and based on the creation of artificial optical polyphonic sound tracks on transparent film.