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Parallel generation device for syndromes in synchronous byte decoder based on lookup table

An adjoint, look-up table technology, applied in the direction of using block codes for error correction/detection, applying multi-bit parity bit error detection coding, data representation error detection/correction, etc., can solve the problem of consuming logic resources and running speed Slow and so on

Pending Publication Date: 2021-07-06
COMMUNICATION UNIVERSITY OF CHINA
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  • Description
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Problems solved by technology

[0005] The syndrom generation device provided by the digital multi-program system B uses 1512 registers and 8 two-input XOR gates, which consumes a lot of logic resources. It takes 1504 clock cycles to calculate the syndrom once, and the running speed is slow.

Method used

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  • Parallel generation device for syndromes in synchronous byte decoder based on lookup table
  • Parallel generation device for syndromes in synchronous byte decoder based on lookup table
  • Parallel generation device for syndromes in synchronous byte decoder based on lookup table

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Embodiment Construction

[0014] 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.

[0015] exist figure 1 In , the received data sequence and output sequence are marked as a i and d i , their values ​​are '0' or '1', where, 0≤i1496 ~ d 1503 A 1-byte syndrome is formed.

[0016] figure 1 The corresponding polynomial model is as figure 2 As shown, its input and output are respectively

[0017]

[0018]

[0019] When 0≤ii and d i and figure 1 a in i and d i exactly the same. exist figure 2 Among them, the IIR filter completes the division operation of the generator polynomial g(x), and the FIR filter completes the polynomial [1+x 1497 The multiplication operation of b(x)], where g(x)=1+x+x 5 +x 6 +x 8 , b(x)=1+x+x 3 +x 7 . The IIR filter and the FIR filter form a joint filter whose characteristic polynomial is

[0020]

[0021] The coefficients of the...

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Abstract

The invention relates to a parallel generation device for syndromes in an MPEG-2 synchronous byte decoder based on a lookup table. The device is suitable for a digital multi-program system B recommended by ITU-T J.83, and is characterized in that the device mainly consists of a 1504-bit memory, 15 registers from R0 to R14, 128 two-input AND gates and 128 two-input exclusive-OR gates. 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, the logic resource requirement is effectively reduced, and the device has the advantages of being high in operation speed, small in logic resource consumption and the like.

Description

technical field [0001] The invention relates to the field of cable digital television, in particular to the concurrent generation technology of MPEG-2 synchronous byte decoder based on look-up table 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/11
Inventor 刘昌银张鹏杜建和陈远知
Owner COMMUNICATION UNIVERSITY OF CHINA
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