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Frame synchronization processing method and frame synchronization circuit

A technology of synchronous processing and processing method, which is applied in the field of digital signal transmission, can solve the problems of longer frame synchronization processing time and weak verification ability of linear feedback shift circuit, so as to shorten the time of frame synchronization and reduce the cost of repeated search The effect of frequency and accuracy improvement

Active Publication Date: 2013-03-20
HUAWEI TECH CO LTD
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Problems solved by technology

In addition, because the verification ability of the linear feedback shift circuit is not strong, after the code stream within the frame length range of an MPEG frame is verified by the linear feedback shift circuit, there may be more than one position where the verification result is 47H
This makes the locking process (that is, the process of finding a position point with a check result of 47H at the same position) search repeatedly, and the frame synchronization processing time becomes longer

Method used

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  • Frame synchronization processing method and frame synchronization circuit
  • Frame synchronization processing method and frame synchronization circuit
  • Frame synchronization processing method and frame synchronization circuit

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] refer to figure 1 , figure 1 It is a flow chart of an embodiment of a method for processing frame synchronization of MPEG frames in the present invention, including:

[0036] Step S101: Obtain at least two position points whose first verification result of the code stream within an MPEG frame range meets a preset target, and record them as a first position group.

[0037] An MPEG frame range refers to an MPEG frame code stream that has the same frame length as a complete MPEG frame.

[0038] The first check result is the check result obtained after the MPEG frame code stream is checked serially through the linear shift register. The verification referred to in this embodiment is the verification performed by the MPEG frame code stream serially passing through the linear shift register. Of course, within the scope of the spirit of the presen...

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Abstract

The invention discloses a processing method for performing frame synchronization on moving picture experts group (MPEG) frames and a frame synchronization circuit. A frame synchronization processing method comprises obtaining at least two position points in accordance with first verification results of code streams in an MPEG frame range, and recording the at least two position points as a first position set; obtaining position points in accordance with first verification results in the first position set of code streams in a next MPEG frame range, and recording the position points as a fixed position set; and using at least one of the fixed position points in the fixed position set in accordance with preset targets to perform frame synchronization processing on code streams in subsequent MPEG frame ranges. According to the frame synchronization processing method and the frame synchronization circuit, repeated searching times can be decreased greatly, and the frame synchronization time is shortened.

Description

technical field [0001] The invention relates to the field of digital signal transmission, in particular to a frame synchronization processing method for MPEG frames and a frame synchronization circuit. Background technique [0002] In synchronous digital communication, data are sent and received according to the agreed frame format. If the transmission distance is long, in order to save connection resources, a separate connection is generally not used to transmit the frame alignment information of the data to the receiving end. For long-distance transmission, the method used is: at the sending end, insert a fixed frame synchronization header at regular intervals, and arrange the effective data to be transmitted between the frame synchronization headers; at the receiving end, re-identify the frame through frame synchronization technology synchronization header to determine the location of valid data. In simple terms, frame synchronization is the process of determining the p...

Claims

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Application Information

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IPC IPC(8): H04N21/236
Inventor 虎忠义张杰
Owner HUAWEI TECH CO LTD
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