公开(公告)号：US20040004977A1

公开(公告)日：2004-01-08

申请号：US10421317

申请日：2003-04-22

Applicant: STMicroelectronics Limited

Inventor： William Robbins ,  David Wilkins

IPC: H04J003/04

CPC classification number: H04N21/434

Abstract: There is disclosed a circuit and method for demultiplexing in a receiver a digital data stream including at least two types of data, so as to retain only those parts of the digital data stream required by the receiver. In one particular application, such a receiver is used in a television system having a digital set-top-box receiver. A first control circuit extracts a packet identifier from an input data packet in the digital data stream, and generates a signal in dependence on whether the input data packet is of the first or second type. Sets of information associated with the first types of data packets and required by the receiver are stored in a memory under the control of a second control circuit. A third control circuit, responsive to receipt of the first type of input data packet, determines whether at least part of the input data packet matches the stored sets of information, and sets a match signal responsive thereto.

Abstract translation: 公开了一种用于在接收机中解复用包括至少两种数据的数字数据流的电路和方法，以便仅保留接收机所需的数字数据流的那些部分。 在一个特定应用中，这种接收机用在具有数字机顶盒接收机的电视系统中。 第一控制电路从数字数据流中的输入数据包中提取分组标识符，并根据输入数据分组是第一类还是第二类产生信号。 在第二控制电路的控制下，与第一类型的数据分组相关联并且由接收机所要求的信息集存储在存储器中。 响应于接收到第一类型的输入数据分组的第三控制电路确定输入数据分组的至少一部分是否与存储的信息组匹配，并且响应于此设置匹配信号。