本文首先对单向、随机错并存时的错误模式进行较深入分析,按对各种错误模式的纠/检错能力定义纠/检错码。对D.K.Pradhan针对单向,随机错并存提出的纠/检错码进行深入讨论,给出了T_4码(纠t个错并检随机错≤t的任意错)的译码算法及其一般实现电路。 In this paper, the error patterns of unidirectional and random errors coexist are analyzed firstly, then the error detection / detection error codes are defined according to the ability of error detection and error detection of various error patterns. This paper discusses in depth the DKPradhan ’s error detection / detection error code proposed by coexistence of unidirectional and random errors, and presents the decoding algorithm of T_4 code (arbitrary error ≤ t) and its general implementation circuit .