# \[077]Ch4-Error detection with time redundancy

## \[077]Ch4-Error detection with time redundancy

* 本章最重要的concept就是利用“時間”去做error detection, 如果是real-time的application 就不適用。
* 另外，本章的概念較少，直得一提的是，Time redundancy 是否能 detect **"permanent faults"**
* 原理：用encoding/decoding的方式，與原來經過f計算值做比較，如果有誤，那就是有error
* 例子：具體來說，用RESO (recomputing with shifted-operands)，來detect某一個**module**是否有誤


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