公开(公告)号：US20040223578A1

公开(公告)日：2004-11-11

申请号：US10841705

申请日：2004-05-07

Applicant: STMICROELECTRONICS SA

Inventor： Jean-Pierre Lagarde

IPC: H03D003/24

CPC classification number: H03L7/0994

Abstract: A circuit is provided for clock recovery from a specified datastream. The circuit includes a reference extraction unit for extracting from the datastream time references defining a reference time base, and a digital Phase Locked Loop coupled to the reference extraction unit. The digital Phase Locked Loop includes a first programmable counter in the guise of a digitally controlled oscillator for overseeing an output time base, a second programmable counter in the guise of a loop divider for overseeing a loop time base, and a dedicated processor capable of executing a program. The program includes a first software module in the guise of a phase comparator for comparing values of the loop time base and the reference time base and generating a loop error; and a second software module in the guise of a loop filter for producing an adaptation value of an increment value of the first programmable counter from the loop error. Also provided are a user terminal for an interactive telebroadcasting system that includes at least one such circuit for clock recovery, and a method for clock recovery from a specified datastream.

Abstract translation: 提供电路用于从指定的数据流中恢复时钟。 该电路包括一个参考提取单元，用于从数据流中提取定义参考时基的时间参考，以及耦合到参考提取单元的数字锁相环。 数字锁相环包括用于监视输出时基的数字控制振荡器的伪装的第一可编程计数器，用于监视环路时基的循环分配器的伪装的第二可编程计数器和能够执行的专用处理器 一个程序。 该程序包括一个相位比较器的伪装的第一软件模块，用于比较环路时基和参考时基的值并产生一个循环误差; 以及环路滤波器的伪装的第二软件模块，用于从循环误差产生第一可编程计数器的增量值的自适应值。 还提供了一种用于交互式电传广播系统的用户终端，其包括用于时钟恢复的至少一个这样的电路以及用于从指定数据流进行时钟恢复的方法。

公开(公告)号：US20040261129A1

公开(公告)日：2004-12-23

申请号：US10765455

申请日：2004-01-27

Applicant: STMICROELECTRONICS SA

Inventor： Jean-Pierre Lagarde

IPC: H04N007/173 ,  H04N007/16

CPC classification number: H04N21/6193 ,  H04N7/17309 ,  H04N21/242 ,  H04N21/6143 ,  H04N21/8166 ,  H04N2007/17372

Abstract: A terminal for interactive telebroadcasting system comprising on the one hand a unit for adaptation to the physical telebroadcasting medium and on the other hand a control unit. The first unit comprises a receiver for receiving of a telebroadcast signal and for producing downstream information extracted from the signal, a transmission time based generator for generation of a transmission time base from the downstream information and a transmitter for transmission of a return signal, which are clocked as a function of the transmission time base. The second unit comprises a calculation unit having means of generating upstream information. The calculation unit is clocked as a function of the transmission time base.

Abstract translation: 一种用于交互式电话广播系统的终端，其一方面包括用于适应物理电话广播媒体的单元，另一方面包括控制单元。 第一单元包括用于接收电话广播信号并用于产生从信号提取的下行信息的接收机，用于从下游信息生成传输时基的基于传输时间的发生器和用于发送返回信号的发射机，它们是 作为传输时基的函数。 第二单元包括具有生成上游信息的装置的计算单元。 计算单元作为传输时基的函数计时。