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    • 33. 发明授权
    • Adaptive timing
    • 自适应时序
    • US4965811A
    • 1990-10-23
    • US209629
    • 1988-06-20
    • Thomas C. Sparks
    • Thomas C. Sparks
    • H04J3/06H04Q11/04
    • H04Q11/0435H04J3/0626
    • In some digital communications systems, such as the Integrated Services Digital Network (ISDN), problems may occur in recovering timing from signals generated by several terminals located varying distances from a common transmitter. Timing recovery is facilitated by detecting a marker of a frame transmitted to the several terminal equipments, detecting a corresponding marker receives shortly afterwards from one of the terminal equipments; and sampling the received digital signal at a sampling instant delayed relative to a specific feature of the received marker, for example, a zero crossing immediately following a frame bit. Preferably, the delay between the sampling instant and the occurrence of the specific feature used as a reference point is proportional to the time elapsed between detection of the outgoing or transmitted marker and detection of the incoming or received marker and hence proportional to the round trip propagation time.
    • 在诸如综合业务数字网(ISDN)的一些数字通信系统中,可能会在从与公共发射机变化距离的几个终端产生的信号恢复定时时出现问题。 通过检测发送到多个终端设备的帧的标记来检测定时恢复,随后从一个终端设备检测相应的标记; 并且以相对于所接收的标记的特定特征延迟的采样时刻采样接收到的数字信号,例如紧跟在帧位之后的零交叉。 优选地,采样时刻和用作参考点的特定特征的出现之间的延迟与检测到输出或发射标记之间经过的时间成比例,并且与进入或接收标记的检测成正比,并且与往返传播成正比 时间。