（1）基本要求：
a．被测信号的频率范围为1～20kHz，用4位数码管显示数据，十进制数值显示。
b．被测信号为幅值1～3V的方波、脉冲信号。
c．具有超量程警告（可以用LED灯显示，也可以用蜂鸣器报警）。
d．当测量脉冲信号时，能显示其占空比（精度误差不大于1%）。
（2）发挥部分
a．修改设计，实现自动切换量程。
b．扩宽被测信号能测量正弦波、三角波。
c．其它。
2021-12-06 16:28:21
468KB
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国际绝对音名十二等律标准音高频率对照表（浮点型精度、十二等律体系、A4=440.01000Hz）
https://blog.csdn.net/weixin_53403301/article/details/121737931
2021-12-06 09:14:02
11KB
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自己写的基于频率的密文解密程序
1.File List
source.txt : the raw text from the router.
target.txt : the text encoded.
result.txt : the text to be decoded.
2.Task:
We created a charactors-to-charactors mapping table. For example: A -> s; B -> Z; ... Using this mapping table, the text from "target.txt" are encoded while the "source.txt" is the raw plain text as the reference corpus. Your target is to find the mapping table, and then decode the text from "result.txt". Send the decoded text to E-mail: gaga.zhn@gmail.com
3.Tips
i. The charactors mapping is a kind of a bijective mapping (or one-to-one correspondence).
ii. The numbers and others non-alphabets are not changed.
4.Bonus
The first three person who sends the correct text and provides his own program will receive a special gift.
5.This is not a group work.
2021-12-05 14:07:16
5.27MB
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