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单片机产生正弦波
2019-03-24 17:44
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51单片机
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使用stc12c5410ad的PWM功能,如何产生1KHz的正弦波?是不是产生频率一定的脉冲信号,通过程序控制脉冲信号的脉宽不同,经过RC滤波器后,就可以产生正弦波信号了?对于脉冲信号的脉宽与正弦波有什么什么关系?有公式吗?正弦波的频率与脉冲信号的频率有什么关系?如果要产生有正负半周的正弦波需要怎么做?新手请高手指点一下思路:$ ? 此帖出自
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19条回答
coney
1楼-- · 2019-03-25 23:09
我再看看啊,谢谢你哈
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sjl2001
2楼-- · 2019-03-26 02:08
精彩回答 2 元偷偷看……
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coney
3楼-- · 2019-03-26 02:38
这个计算,不会是手工画图出来的吧?这样计算误差不是很大吗?你可不可以举个例子啊,就比如正弦波是1kHz,脉冲信号是100kHz,脉冲信号宽度咋个算出来?我看到一个正弦波离散值,是不是一下这个?
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ch0721
4楼-- · 2019-03-26 06:31
这个是啥 不是DAC用的吧 PWM要用timer 来定时 有一些好一点的单片机则集成了PWM的功能 你要是想自己写定时的话 可以先做一个周期的表 计算完全可以编程实现 设定好步长就是正弦与三角波相减 大于0取高小于零取低
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coney
5楼-- · 2019-03-26 07:02
精彩回答 2 元偷偷看……
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ch0721
6楼-- · 2019-03-26 11:22
等我忙完这一段的 帮你写一个 现在要赶个机械图
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