| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a sound attenuation device not influenced by noise other than a cooling fan without phase delay of reversed phase sound, and electronic apparatus using the same. <P>SOLUTION: This device includes a cooling fan cooling a parts generating heat during operation and having periodicity in noise generated during cooling, FG signal detection part 9 detecting signal from the cooling fan, a storage part storing reversed phase sound of the noise generated from the cooling fan corresponding to the detected signal, and a timing adjustment part 11 adjusting timing of start of one cycle of the signal and the reversed phase sound. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
