请教如何求频率
我测得的信号如图所示,我想求低电平(峰谷)的频率,试了很多方法都不行,哪位大侠能否给些建议啊,谢谢了先。<img src="attachments/dvbbs/2006-3/200633021442287841.bmp" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2006-3/200633021442287841.bmp\');}" onmousewheel="return imgzoom(this);" alt="" /> 右击这个waveform chart,然后建立一个它的属性节点,在里面选择:y scale-->range-->minimum这里能获取最小值! 谢谢你的帮助,我是把数据存成.bin格式的(write to SGL),然后用graph显示出来,我现在主要是想求波谷的频率,而不是波谷的值,当然也可以用cursor得到波谷的坐标,然后可以求到两个波谷间的距离,但是这样比较麻烦,不知道怎么能自动求出,希望斑竹指点一下,谢谢了先。
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