公开(公告)号：EP1389382A4

公开(公告)日：2004-02-18

申请号：EP98960624

申请日：1998-12-02

申请人： TELCORDIA TECH INC

发明人： BANWELL THOMAS C ,  CHEUNG NIM K

IPC分类号： H04L7/02 ,  H04L7/027 ,  H04L7/033 ,  H04L25/02 ,  H04L23/00

CPC分类号： H04L25/0262 ,  H04L7/027 ,  H04L7/0334

摘要： Methods and apparatuses consistent with the present invention recover a clock signal (160) from a variable bit rate data signal by estimating, in the time domain, the bit rate of the data signal, and based on the estimated variable bit rate, determining a center frequency of a narrow-band filter (330) for extracting the clock signal from the data signal (155). A clock recovery circuit (300) consistent with the present invention extracts a clock signal from a variable bit rate data signal by estimating a minimum time interval between transition (320) in the data signal, generating a plurality of pulses that correspond respectively to transitions in the data signal, adjusting the duration of each of the pulses based on the estimated minimum time interval (310) and inputting into a narrow-band filter (320) the adjusted pulses (RS2), determining the center frequency of the narrow-band filter (320) based on the estimated minimum time interval, and extracting in the narrow-band filter (320) the clock signal (160) from the adjusted pulses.

摘要翻译： 根据本发明的方法和设备通过在时域中估计数据信号的比特率并基于估计的可变比特率来从可变比特率数据信号中恢复时钟信号（160），从而确定中心 用于从数据信号（155）提取时钟信号的窄带滤波器（330）的频率。 符合本发明的时钟恢复电路（300）通过估计数据信号中转换（320）之间的最小时间间隔，从可变比特率数据信号中提取时钟信号，产生多个脉冲，分别对应于 所述数据信号基于估计的最小时间间隔（310）调整每个脉冲的持续时间并将调整的脉冲（RS2）输入到窄带滤波器（320）中，确定窄带滤波器的中心频率 （320），并且从所述调整后的脉冲中提取所述时钟信号（160）在所述窄带滤波器（320）中。

公开(公告)号：EP1078481A4

公开(公告)日：2004-06-16

申请号：EP99921955

申请日：1999-05-13

申请人： TELCORDIA TECH INC

发明人： BANWELL THOMAS C ,  CHEUNG NIM K ,  ANDERSON WILLIAM T ,  HODGE JAMES

IPC分类号： H04B10/02 ,  H04B10/08 ,  H04Q11/04 ,  H04B14/06

CPC分类号： H04B10/079 ,  H04B10/0795 ,  H04J2203/0062

摘要： Methods and apparatuses are provided for determining characteristics of an input optical signal in an optical network. An optical signal monitoring apparatus (200) estimates a minimum time interval between transitions (210) in the input signal, determines a clock signal (206) based on the estimated minimum time interval, and performs a time domain measurement (230) on the input signal based on the determined clock signal. The optical signal monitoring apparatus (200) samples the input signal based on the determined clock signal and determines the characteristics of the input signal.