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I_1-ch窗函数是Dolph-窗函数的一个极好的近似,它在时域和频域都能给出显式表达,因而应用上比Dolph-窗函数方便得多。本文研究了I_1-ch窗函数的性质,着重讨论了在滤波器设计中的应用,说明了与其他窗函数方法以及最优化方法相比,I_1-ch窗方法兼有运算量小和接近最佳设计的优点。最后还给出了实际应用的例子。
The I_1-ch window function is an excellent approximation of the Dolph-window function, which gives explicit expressions both in the time and frequency domain and is therefore much more convenient to use than the Dolph-window function. In this paper, the properties of I_1-ch window function are studied, and the application in the filter design is emphatically discussed. Compared with other window function methods and optimization methods, the I_1-ch window method has the advantages of small amount of computation and close to best The advantages of design. Finally, it gives an example of practical application.