A Photographical Sound Visualization Method Using Light Emitting Diodes
Kohshi NISHIDA, Akira Maruyama · Bulletin of JSME · 1985
This paper describes a sound visualization method using three color-light-emitting diodes; the distribution of sound pressure levels around each sound source obtained actually by this method; and the comparison of this method with one using a plotter for recording the measured results. In this sound visualization method, the distribution of sound pressure levels is measured with a sound visualization device built as a trial. This device consists of an auto-scanning device of a microphone with three color-light-emitting diodes; an indicator of sound pressure level which switches on or off those diodes at each instance when the sound pressure level changes by 5 dB; and a photographing set for recording the color-lights emitted from those diodes on a film. The results show that properties of sound field, such as the distribution of sound pressure levels of sound diffraction can be precisely obtained by this method.