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    • 13. 发明授权
    • Error detection and correction
    • 错误检测和纠正
    • US4119945A
    • 1978-10-10
    • US812364
    • 1977-07-01
    • Henry Garton Lewis, Jr.Seraphin Bernard Calo
    • Henry Garton Lewis, Jr.Seraphin Bernard Calo
    • H03M13/35H03M13/43H04L1/00H04N7/66G06F11/12
    • H04L1/0057H03M13/35H03M13/43H04L1/007
    • An error detection and correction system in which at least the highest order bit of each data word is given a greater protection against errors in transmission than lower order bits. Useful for digitized TV signals where errors in received high order bits have much worse effect on picture quality than errors in low order bits. A parity is generated for each data word in accordance with a self-orthogonal convolutional code constructed by the use of the base elements of a difference triangle for each bit of the data word, the difference triangles being disjoint, the triangle associated with the highest order bit or bits having a large number or numbers of base elements, and the triangles associated with the lowest order protected bit or bits consisting of a single base element. Errors in received code words are detected and corrected in a decoder including majority logic threshold detectors. Error correcting feedback to the syndrome shift register is limited to errors detected in the high order bits.
    • 一种错误检测和校正系统,其中每个数据字的至少最高位对于低位比特被赋予比传输中的错误更大的保护。 对于数字化电视信号而言,其中接收到的高位比特误差对图像质量的影响比低位比错误更差。 根据通过使用数据字的每个位的差分三角形的基本元素构成的自正交卷积码,每个数据字生成奇偶校验,差分三角形是不相交的,与最高阶相关联的三角形 具有大量或多个基本元素的位或位,以及与由单个基本元素组成的最低阶保护位或相关联的三角形。 在包括多数逻辑阈值检测器的解码器中检测和校正接收到的码字中的错误。 错误校正反馈到纠错移位寄存器限于在高位中检测到的错误。