| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a headphone, with a simple structure at low cost, having a noise reduction function which allows noise reduction corresponding properly to noise environment. <P>SOLUTION: The headphone reduces a noise through a processing system in which an analog voice signal of a noise obtained by sound-picking of a microphone is converted into a digital sound signal, a noise reduction voice signal to reduce the noise is created from the digital sound signal, and the noise reduction voice signal is acoustically reproduced for acoustic synthesis with the noise. The headphone has retention means for retaining multiple parameters corresponding to multiple types of noise characteristics, selection setting means for selecting a parameter suitable to reduce a noise having noise characteristics shown by an analysis result given by noise characteristic analysis means from among the multiple parameters retained by the retention means, and digital processing means for creating a noise reduction voice signal by using the digital sound signal and the selected parameter. <P>COPYRIGHT: (C)2013,JPO&INPIT |
