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Method for synchronizing data frames and apparatus thereof

A technology of data frame and synchronization word, applied in the field of data frame synchronization method and its equipment, can solve the problems of inability to synchronize, slow synchronization speed, etc., and achieve the effect of accurate and stable data frame synchronization method

Inactive Publication Date: 2010-02-17
HAIER BEIJING IC DESIGN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the randomness of the data, the same data segment as the sync word may also appear in it, so the sync detector may detect the wrong sync position and cause the sync speed to be slow or even impossible

Method used

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  • Method for synchronizing data frames and apparatus thereof
  • Method for synchronizing data frames and apparatus thereof
  • Method for synchronizing data frames and apparatus thereof

Examples

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Embodiment Construction

[0020] image 3 is a structural block diagram of a data frame synchronization device according to the present invention.

[0021] Such as image 3 As shown, the data frame synchronization device according to the present invention includes a synchronization word detection unit, a modulo-N counter, a plurality of genlock units and a control decision unit, wherein the plurality of genlock units are respectively shown as genlock units in the figure 1. A genlock unit 2 . . . a genlock unit L. It should be understood that a modulo-N counter is a loop counter that counts loops modulo N.

[0022] Assuming that the frame length of the input data is N, the modulo-N counter counts the input data cyclically with the frame length N as the period, and outputs the count value to a plurality of synchronous locking units and control decision units, and the output count value ranges from 0 to N-1.

[0023] Assuming that each frame of data contains M synchronization words, which are distribut...

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PUM

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Abstract

The invention relates to a method for synchronizing data frames. The method comprises the following steps: capturing sync words in the data frames, and outputting a capture indicator signal and a capture sync word serial number; according to the capture indicator signal, the capture sync word serial number and a current count value, executing multiplex synchronization lock, computing and latchingthe frame head position, and outputting a locked signal and an empty / full indicator signal, wherein the count value is obtained by executing a cycle count taking a frame length as a cycle to the received data frames, the empty / full indicator signal comprises an empty state and a full state respectively indicating unlatched and latched; according to the locked signal, outputting a locking indicatorsignal, outputting a frame head indicator signal according to the current count value, and outputting a write enable signal according to the empty / full signal, wherein the write enable signal is usedfor coordinating the multiplex synchronization lock. The invention achieves a fast, exact and stable data frame synchronizing method.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a data frame synchronization method and equipment thereof. Background technique [0002] In the field of digital communication, data is often encapsulated into data frames with a fixed format for transmission, and a specific synchronization word is added to a fixed position of each frame. As long as the position where the sync word is locked, the receiver can correctly judge the starting position of the data frame. [0003] figure 1 It is the data frame format of MPEG-2 transport stream. Such as figure 1 As shown, the MPEG-2 transport stream widely used in the digital TV broadcasting system has a standard data frame format. In this format, the length of the data frame is 188 bytes, and the first byte is a synchronization byte with a value of 0x47. The receiving end can realize data frame synchronization by capturing and locking the synchronization byte in the transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L29/06
Inventor 邓周
Owner HAIER BEIJING IC DESIGN
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