循环冗余码校验

Introduced a cyclic redundancy check code for error control principle and algorithm.

介绍了循环冗余校验码的差错控制原理及其算法实现。

In the paper, we give the method of checking form based on module 2 by searching the 16 bits Cyclic Redundancy Check Code .

本文研究了16位的循环冗余校验码CRC-CCITT在数据通信中的应用，给出了基于模2运算的查表法，实验证明：在保证了系统通信可靠性的基础上，大大提高了计算速度。

The program based on SPITH I cut from the cyclic redundancy check code, running success!

本程序实现了基于SPITH的自删余循环冗余校验码，运行成功！

In terms of the HDLC frame structure and the theory of cyclic redundancy check, the implementation of the modules, constructing and deconstructing HDLC protocol frame, producing and checking the CRC code, and adopting the FPGA new technology were discussed.

为了控制器与微波设备之间数据的可靠传输，根据HDLC协议的帧结构和循环冗余校验原理，提出了一种新型的基于并行机制的HDLC协议控制器，讨论采用FPGA新技术实现HDLC协议帧的构成、解析模块及其内部的CRC码生成、检验模块的方法。

Checksum, CRC, hash algorism, message digest, digital autograph and public denskey system are thetechnology to transmit relative data, confidential information and veracity confirmation through compuer or internet, and couldbe applied to the government network.

校验和、循环冗余校验码、散列算法、消息摘录、数字化签名和公共密钥加密系统是可用于INTERENT网或用计算机传送的有关数据、信息加密和真实性确认的技术。

The polarities check ability, minimum code distance and capacity of correct single bit error of CRC-CCITT are proved by using galois field polynomial theory.

以国际标准CRC-CCITT循环冗余校验码为研究对象，利用近世代数多项式理论证明其奇偶校验性质、最小码距和纠正单比特错误能力。

The CRC-CCITT cyclic redundancy check code in international standard is studied in this paper. The polarities check ability, minimum code distance and capacity of correct single bit error of CRC-CCITT are proved by using galois field polynomial theory.

以国际标准CRC-CCITT循环冗余校验码为研究对象，利用近世代数多项式理论证明其奇偶校验性质、最小码距和纠正单比特错误能力。

Finally it mathematically calculates the CRC at bit and byte level and deducts a 16-bit CRC. The calculation and deduction consolidate the CRC theory. Chapter three also introduces the modulation by two, CRC polynomial, reflection polynomial applied in noise environment and the relationship between reflection polynomial and general polynomial.

第三章首先阐述了循环冗余码与循环码的关系——循环冗余码是一种短循环码、循环冗余码具有所有循环码的很多性质；然后，简单介绍循环冗余码的编码、译码原理和实现；最后，从普通数学的角度，分别用按比特、按字节求解CRC，详细推导了校验码宽度为16的CRC的理论过程，进一步为循环冗余码的研究提供有力的理论基础。

Is a transfer mode in which all types of information are organized into fixed form cells on all asynchronous or nonperiodic basis over a range of mediA.(70) is an identifier of a web page.

循环冗余校验(cyclic-redundancy check，CRC)是由分组线性码的分解而来，其主要应用是二元码组，主要应用于数据传输过程中的差错控制。

cyclic redundancy check code is a very important cyclic code,the coding and decoding methods are simple,easy to realize.it is strong to detect error,the probability of misjudging is nearly zero.it is a method with extremely high efficiency in controlling errors,which can fulfill the requirement of reliable information transmission in communication systems.it has got very extensive application in observing and controlling and data communication.this paper introduces the encoding and decoding principle of crc in detail,analyzes the feasibility of crc by dsp,and gives out the design proposal and flow chart according to the principle,which is very useful in applications.

摘 要：循环冗余校验码是一种重要的循环码，编码和解码方法简单，容易实现，检错能力强，误判概率几乎为零，是一种效率极高的差错控制方法，可以满足通信系统可靠传送信息的要求，在测控及数据通信中得到了非常广泛的应用。详细介绍了循环冗余校验的编解码原理，分析了用dsp实现crc的合理性，最后给出了根据校验原理实现的设计思想及流程图，具有一定的实用价值。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。