| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a third person to judge whether a listening device is normally operating, and enable a listener to clearly judge the operating status when the listener is using the listening device. <P>SOLUTION: A microphone is provided near speakers of the listening device. This configuration verifies for the listener whether sounds can be normally reproduced, or adds a pilot signal difficult to be heard for a person to a reproduced signal to verify the reproduction status. <P>COPYRIGHT: (C)2007,JPO&INPIT |
