说明：  直接法求双谱，间接法求双谱，还有基于AR模型法求双谱。程序里面还提供了一种很方便的求对角线谱的方法，大家可以借鉴。总之，你下载了，绝对不后悔的。
(Direct method bispectrum, bispectrum Indirect Method, as well as AR Model Method based on dual spectrum. Program which also provides a convenient way to find the diagonal spectrum, we can learn from. In short, you download, and definitely do not regret it.)