一种改进的余弦窗及其DSP实现

提出了一种减少频谱泄漏,而又易于实现的改进的余弦窗,其核心思想是对一般的余弦窗函数施加一个指数m,根据对频率分辨率和幅值精度、旁瓣抑制的侧重不同,改变m的值,得到不同性能的改进余弦窗.在DSP中软件实现时,针对不同的m值,进行不同次数的循环来实现.仿真结果表明,这是一种效果比较好的加窗方法.

Improved Cosine Window and Its Implementation with DSP

An improved cosine window is put forward, which can reduce the spectrum leakage and can be easily implemented. The center of the method is to apply an exponent-m-to the usual window function. A proper value can be chosen for the exponent in light of the particular emphasis on frequency resolution, amplitude precision or sidelobe suppression and we can modify the characteristic of the window function through altering the value of m. Cycle of different times is effect.Carried out to implement it in DSP with software. The result of the emluator makes it clear that it is a method with good effect.