Noise characteristics of sound-generating toys
* Presenting author
In this study, noise characteristics of sound-generating toys were investigated to understand adverse effects of toy noise on children' hearing. Eleven types of sound-generating toys were chosen to be measured in an anechoic chamber. In consideration of apparent size of each toy, measuring positions were determined as 50 cm off from surface of reference box for each toy toward 5 directions (front, rear, left, right and top). In South Korea, legal guideline of toy noise level is 65 dB(A) at 50 cm off position for toys used close to ear, 85 dB(A) for other types. As results, A-weighted equivalent sound pressure level was ranged 52 to 94.2 dB(A) at 50 cm. In case of toy drum, very high sound pressure peak level was observed up to 100 dB(A). Major frequency characteristics were found at 500 to 4000 Hz around due to poor quality of built-in loudspeakers. Even within a single toy, sounds with different contents and time length were randomly generated. In addition, directional properties of toy noise were discussed.