| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a noise reduction system which includes an earphone for allowing a user to enjoy, for example, reproduced music or the like, with reduced ambient noise. <P>SOLUTION: A noise reduction system comprises: a loudspeaker 3 that is connected to a loudspeaker input path and radiates noise reducing sound; a microphone 4 that is connected to a microphone output path and picks up noise or a residual thereof; and an active noise reduction filter that is connected between the microphone output path and the loudspeaker input path and comprises at least one shelving filter. <P>COPYRIGHT: (C)2013,JPO&INPIT |
