| 摘要 |
PURPOSE:To output an alarm sound from a headphone, etc., in the case the headphone is separated from the equipment main body by a prescribed distance or above. CONSTITUTION:A feeble radio wave transmitted from a transmitting/receiving part 8 of a main body part B is received and demodulated by a transmitting/ receiving part 1 of a headphone part A, intensity of a signal is detected by a signal intensity detecting part, compared with a reference value of signal intensity set by a reference value setting part 3 by a discriminating part 4 through a control part 7, and in the case of being below the reference value, an alarm sound is generated by an alarm generating part 5, and outputted through an output part 6. This alarm sound is modulated to a high frequency signal, transmitted by a feeble radio wave from the transmitting/receiving part 1, received and demodulated by the transmitting/receiving part 8, the signal of the alarm sound is detected by an alarm detecting part 9, and the alarm sound is outputted from an output part 10. |
