| 摘要 |
<p>A TELEPHONE TACTILE ALERT SYSTEM A telephone user who cannot hear the telephone ringing is alerted, other than audibly, to the fact that the telephone must be answered. A radio transmitter at the telephone is driven by ringing voltage supplied to the instrument. The transmitter emits a radio signal which is picked up by a receiver carried by the telephone user. Upon detection of the received signal, a tactile transducer is actuated and alerts the telephone user to the fact that the telephone must be answered. _ 1 _</p> |
