能够测量一定范围的信号频率，方波，正余弦信号。-Can measure a range of signal frequency, square wave, sine and cosine signals.

快速傅里叶转换程序，简单好用，说明清楚，内容详细，里面有正弦，余弦转换程序，可以用来产生正余弦数组。强烈推荐！~-Fast Fourier transformation program, simple to use, the instructions clear, detailed, there are sine, cosine conversion program, and can be used to generate positive cosine array. It is highly