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    • 3. 发明授权
    • System for providing paging receivers with accurate time of day
information
    • 为寻呼接收机提供准确的时间信息的系统
    • US5859595A
    • 1999-01-12
    • US740587
    • 1996-10-31
    • Robert W. Yost
    • Robert W. Yost
    • G04G5/00G04G21/04H04M11/00
    • G04R20/14G04R20/02
    • A system is described for providing one or more remote paging receivers with accurate time of day information utilizing a paging provider which encodes page messages into RF signals corresponding to baseband signals for transmission via a paging channel to the receivers. The system includes the receivers and a controller. The controller sends a first page message, which defines an on-time point, to the paging provider for transmission via the paging channel to the receivers, and then sends a second page message to the paging provider for transmission via the paging channel to the receivers. Further, the controller detects the transmission of the first page message in the paging channel and determines a time of day when the on-time point of the first page message was transmitted by the paging provider in the paging channel. The second page message sent by the controller comprises data defining this determined time of day. The receivers each detect the first and second page messages in the paging channel, and have a clock for maintaining the time of day. Each of the receivers updates its clock to an accurate time of day responsive to the time of day of the clock when the on-time point of the first page message was received and the time of day defined by the data of the detected second page message. Thus, the receivers are provided with accurate time of day information for maintaining the accuracy of their clocks. In addition, such receivers may output periodically the time of day from their clocks to provide a source for accurate time of day information to other systems.
    • 描述了一种系统,用于使用寻呼提供者提供一个或多个远程寻呼接收机,该寻呼提供商将寻呼消息编码成对应于基带信号的RF信号,以经由寻呼信道传输到接收机。 该系统包括接收器和控制器。 控制器向寻呼提供商发送定义接通时间点的第一页消息,经由寻呼信道发送给接收者,然后向寻呼提供者发送第二寻呼消息,经由寻呼信道发送给接收机 。 此外,控制器检测寻呼信道中的第一寻呼消息的传输,并且确定寻呼信道中的寻呼提供者发送第一寻呼消息的接通时间点的时间。 由控制器发送的第二页消息包括定义该确定的时间的数据。 接收机每个检测寻呼信道中的第一和第二寻呼消息,并且具有用于维持时间的时钟。 当接收到第一页消息的接通时间点并且由检测到的第二寻呼消息的数据定义的时间时,每个接收机响应于一天中的时间来更新其时钟到一天的准确时间 。 因此,为接收机提供准确的时间信息以保持其时钟的精度。 另外,这样的接收机可以周期性地从时钟输出一天的时间,以向其他系统提供准确的时间信息的源。