| 摘要 |
<p>PURPOSE:To increase the using efficiency of the circuit, by transmitting the specific frequency allotted each to make several aural receivers receivable. CONSTITUTION:The audio response unit 30 transmits the transmission starting time carrier to the circuit from the communication control part 34 via the carrier control part 31, and then transmits for a fixed time the frequency allotted to the receiver from the address converting part 35. On the other hand, the receiver 40 detects the carrier at the circuit control part 41 and then waits for the frequency allotted to the self-receiver. Then the receivable state is secured for the aural control part 43 after detection of the frequency at the reception control part 42. Then the unit 30 repeats the calling action in case several receivers 40 exist, and then transmits the voice from the aural data control part 33 in a fixed time after completion of calling. Then the carrier is cut off by the carrier control part 32 when the transmission is through to complete the transmission. In such way, the circuit can be used in a high efficiency.</p> |
