| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an infrared wireless headphone device with which noise is prevented from increasing with the sun light. <P>SOLUTION: The infrared wireless headphone device is provided with a right side light receiving part 8 and left side light receiving part 9 for receiving an optical signal and converting it into an electric signal, a right side cutoff part 10 and left side cutoff part 11 to which electric signals converted by the right side light receiving part 8 and left side light receiving part 9 are inputted, for cutting off the electric signal when a level of the electric signal exceeds a designated level, a signal composing part 12 for composing the electric signals outputted from the right side cutoff part 10 and left side cutoff part 11, and a right speaker 16 and left speaker 17 for converting an amplified signal into a sound and outputting the sound. When strong light such as sunlight is received in one light receiving part, only the signal received by the other light receiving part is demodulated, so that a comfortable sound without noise can be outputted. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
