作者fairwarning (一轮明月与蓝夜!!)
看板Grad-ProbAsk
标题[理工] [电子]-数位类比电路
时间Thu Oct 1 12:02:09 2009
[题目]
An analog signal in the range 0 to +10V is to be converted to an 8-bit
digital signal.
(a)What is the digital representation of an input of 6.2V?
(b)What is the largest possible quantization error as a percent of full scale?
[解答]
每bit解析度为: (10-0)/2^8 -1 = 0.0392伏特
(a) 10011110
(b) 最大误差 0.0392/2伏 , 百分比为0.196%
[疑问]
请问为何(b)最大误差 0.0392 要除以2呢??
要公式吗? 还是有其他观念呢?
谢谢大家的指正,谢谢!!
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◆ From: 163.32.122.2
1F：推 deathcustom:去看Quantization Error相关的东西你就知道了 10/02 03:53
2F：→ deathcustom:其实你从小在作的四舍五入动作就有这种意思 10/02 03:54
3F：→ deathcustom:所以你的尺刻度是1mm，那你量东西的最大误差就是0.5mm 10/02 03:55
4F：→ fairwarning:好 ..我在去看看..谢谢喔 10/02 12:03