| 摘要 |
<p>A wireless audio monitoring system (10, 15) includes a reassurance tone generator (50) for providing the user with the assurance that a receiving unit (15) is within range of the monitoring unit's transmitter (20) and that both are operating properly. The reassurance signal is a brief audible tone transmitted at regular intervals by the monitoring unit (10) to the receiving unit (15). The reassurance tone is either injected as sound into the monitoring unit's microphone (25), as an electric signal into the microphone's amplifier or directly to the transmitter (20). A typical reassurance tone is a quarter-second long audible tone that occurs every ten seconds. At the receiving unit (15), the user has the option of either hearing or not hearing the reassurance tone by either eliminating the tone itself or by muting the loudspeaker (85) during the time the reassurance tone is being received.</p> |
