Syndrome parallel generation device in MPEG-2 synchronous byte decoder

An MPEG-2, accompanying technology, applied in the direction of digital video signal modification, selective content distribution, electrical components, etc., can solve the problems of slow running speed and high resource consumption, and achieve the effect of improving processing speed and reducing resource requirements

Pending Publication Date: 2021-07-02
COMMUNICATION UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The adjoint generation device provided by the digital multi-program system B uses 1512 registers and eight two-input XOR gates, which consumes a lot of resources. It takes 1504 clock cycles to calculate the adjoint, and the running speed is slow.

Method used

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  • Syndrome parallel generation device in MPEG-2 synchronous byte decoder
  • Syndrome parallel generation device in MPEG-2 synchronous byte decoder
  • Syndrome parallel generation device in MPEG-2 synchronous byte decoder

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0014] For the ITU-T J.83 digital multi-program system B, the sender sends the code word sequence c i (0≤i<n), which corresponds to the first n coefficients of the following codeword polynomial c(x)

[0015]

[0016] Among them, c i The value of is '0' or '1'. c(x) consists of four parts:

[0017] c(x)=m(x)+r(x)+s(x)+x k+1 m(x)b(x) (2)

[0018] Among them, m(x) is the information polynomial, its coefficient corresponds to 187 bytes of information, r(x) is the remainder of m(x) modulo 2 divided by the generator polynomial g(x), s(x) is the bias polynomial, b(x)=1+x+x 3 +x 7 , g(x)=1+x+x 5 +x 6 +x 8 . m(x), r(x) and s(x) can be expressed as the following forms respectively:

[0019]

[0020]

[0021]

[0022]Among them, m i 、r i and s i The value is '0' or '1', s k ~s ...

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Abstract

The invention relates to a syndrome parallel generation device in an MPEG-2 synchronous byte decoder, which is suitable for a digital multi-program system B recommended by ITU-TJ.83, and is characterized in that the device mainly consists of 15 registers R0 to R14, 84 two-input exclusive-OR gates and 14 two-input selectors M0 to M13. According to the syndrome generation device, data received by 188 bytes are input in a 16-bit parallel mode, a 1-byte syndrome is output in an 8-bit parallel mode, the processing speed can be improved by 16 times, meanwhile, resource requirements are effectively reduced, and the syndrome generation device has the advantages of being high in operation speed, small in resource consumption and the like.

Description

technical field [0001] The invention relates to the field of cable digital television, in particular to the accompanying parallel generation technology of the MPEG-2 synchronous byte decoder in the digital multi-program system B recommended by ITU-T J.83. Background technique [0002] The MPEG-2 transport packet is 188 bytes long and consists of a 1-byte "sync" field, a 3-byte "header" field and a 184-byte "payload" field. For ease of description, we will collectively refer to the 3-byte "header" field and the 184-byte "payload" field as 187-byte information. [0003] ITU-T J.83 recommends 4 digital multi-program systems for cable distribution of TV, sound and data services, one of which is digital multi-program system B. This system removes the "synchronization" field on the basis of the MPEG-2 transport packet format, and adds a 1-byte "checksum" field after the "payload" field to form a codeword with a length of 188 bytes. . The checksum can be calculated by a FIR pari...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04N19/44H04N19/436H04N21/426
CPCH04N21/42607H04N19/436H04N19/44
Inventor张鹏刘昌银杜建和陈远知
OwnerCOMMUNICATION UNIVERSITY OF CHINA