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Development of Signal Processing Systems for Digital Recording

数字录音信号处理系统的开发

基本信息

批准号：
62550247
负责人：
TAZAKI Saburo
金额：
$ 1.02万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550247/
关键词：
Recording code FM family code Finite Automaton model Viterbi decoding method Partial response system Jacoby type ternary code Digital VTR 光磁気記録システムスライデングブロック方式光磁気記録パーシャルレスポンス方式ビタビ復号

项目摘要

The basic concepts for the imformation density improvements in recording codes are summarized as follows:(1) to include DC-free property in order to restrict cross-talk and dc wandering, (2) to set T_<min> as large as possible in order to reduce the influence of intersymbol interference, where T_<min> is the time separation between two successive polarity changes in recording waveform, (3) to incease channel capacity as a function of several constaint parameters with respect to system design.Although a lot of recording codes are already proposed in this respect, there have been few publications with classification of the code. We introduced the finite automaton model as a useful tool for theoretical description of the coding rule and for facilitation of performance comparison among various proposed codes.FM code, one of the most famous and powerful codes, and its family codes have been investigateds to obtain fundamental insights for systematization of recording codes. It turns out that some conventional codes are identified with FM family codes.The reproduction process of signals in digital recording systems is not required to be a reciprocal function of recording process. For this reason, we adopted Partial Response(PR) systems for equalizing the detected signal and Viterbi algorithm in stead of bit-by-bit decoding method. We also assumed additive noise to be colored. As the results, significant improvements on both effective signal-to-noise ratio and bit error rate are performed.

本文概述了提高记录码信息密度的基本思想：（1）包括无直流特性，以限制串扰和直流漂移;（2）尽可能地增大T_（1）<min>，以减少符号间干扰的影响，其中T_<min>（1）是记录波形中两个连续极性变化之间的时间间隔;（3）增加信道容量，这是系统设计中几个恒定参数的函数。虽然在这方面已经提出了许多记录码，但在某些情况下，它是一种新的记录码。很少有出版物对《守则》进行分类。我们引入了有限自动机模型作为编码规则理论描述和各种拟议代码之间性能比较的有用工具。FM码是最著名和最强大的代码之一，我们对FM码及其家族码进行了研究，以获得记录码系统化的基本见解。结果表明，某些常规码与FM族码相同，数字录音系统中信号的重放过程不要求是录音过程的倒数函数。为此，我们采用部分响应（PR）系统均衡检测信号和维特比算法，而不是逐位解码方法。我们还假设加性噪声是有色的。实验结果表明，该算法在有效信噪比和误比特率方面都有了明显的改善。