论文部分内容阅读
在数字磁带记录中采用各种不同的误差检测和校验方法,可以大大地提高磁带记录数据的可靠性。数字磁带记录中最简单、常用而又有效的校验方法是奇偶校验。例如,九道NRZ1(不归零制)磁带记录中,八道为信息道,一道为奇偶道。通常用奇校。在八个信息道中是偶数个“1”,奇偶道上记“1”;在八道中如是奇数个“1”,奇偶道上就记为“0”,共凑成奇数。在读出或校验过程中,如九道中“1”的个数是奇数,认为是正确的;是偶数,就确
In the digital tape recording using a variety of error detection and verification methods, can greatly improve the reliability of tape recording data. The simplest, common and effective method of verification in digital tape recording is parity. For example, nine track NRZ1 (non-return to zero) tape records, eight for the information track, one for the odd track. Commonly used odd school. In the eight information tracks is an even number of “1”, odd and even track “1”; in the eight is an odd number of “1”, odd and even track is recorded as “0”, a total of odd numbers. In the process of readout or checkout, if the number of “1” in the nine tracks is an odd number, it is considered as correct; if it is even, it is true