| 摘要 |
A transmitter for transmitting an intermittent sequence of messages to maintain synchronization between the transmitter and a receiver. The transmitter includes control apparatus which provides messages for transmission, each message forms part of a sequence of messages and includes control information and timing information, and transmission apparatus which transmits each message. A receiver for synchronizing with a sequence of the transmitted messages. The receiver includes receiver and synchronization apparatus responsive, when enabled, to the control information in the message to indicate to the control apparatus reception of the message. The control apparatus controls power conservation by disabling the receiver and synchronization apparatus for a period of time dependent upon the timing information and enabling the receiver and synchronization apparatus to receive a following message in the sequence. |
