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Method and system for locating packet boundaries

A bit stream, polynomial technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problem of increasing the cost of MPEG packet cutting components

Inactive Publication Date: 2007-08-29
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of each delay line is 1497 bits, thus increasing the cost required by the MPEG packet cutting component

Method used

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  • Method and system for locating packet boundaries
  • Method and system for locating packet boundaries
  • Method and system for locating packet boundaries

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Embodiment Construction

[0060] In order to make the above objects, features and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

[0061] FIG. 6 shows a synchronized MPEG-2 transport packet system 112 according to an embodiment of the present invention. This system 112 includes a sync byte detector 602, a packet data recovery unit 604, a first-in first-out (first-infirst-out) buffer 606, an output interface 608, a variable length delay line 610, a packet A synchronizer 612 and a controller 614 . The variable length delay line 610 receives a data stream, wherein the data stream includes a modified MPEG-2 transport packet. The above sync byte detector 602 can be a decoder for decoding the data stream output by the variable length delay line 610 to obtain a syndrome. The first-in-first-out buffer 606 provides enough memory to retain the input data stream so that the packet data recovery unit 604 c...

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Abstract

The invention provides a method for locating packet boundaries comprising: receiving a first bit stream, and dividing the first bit stream by a first polynomial g(x) to obtain a second bit stream; delaying the second bit stream by a first delay amount to form a third bit stream; multiplying the third bit stream by a second polynomial b(x) to obtain a fourth bit stream; delaying the third bit stream by a second delay amount to form a fifth bit stream; adding the second and fourth bit streams to form a fifth bit stream; multiplying the six bit stream by the first polynomial g(x) to form the delayed first bit stream; wherein the delayed first bit stream is the packet with a located boundary.

Description

technical field [0001] The present invention relates to a technology of packet framing, especially the technology of packet framing of MPEG-2 transport packets. Background technique [0002] When two components dealing with different data formats need to exchange data with each other, another component that can re-cut or recombine the data is needed as the interface between the two components. The interface component accepts data from a communication component and converts it into another appropriate data format for processing by another communication component. [0003] This type of interface component already commonly exists in the communication system commonly used at present. For example, the North American Digital Cable Television Service System (ITU-T R / J.8 3B) specification requires an MPEG encapsulation component to convert the format of the MPEG file so that two Components correctly handle the required data. FIG. 1 shows a block diagram of a communication system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56
CPCH04N21/4385H04N21/4305
Inventor 陈奕甫邱荣梁
Owner MEDIATEK INC