利用频率掩蔽法设计均匀和非均匀余弦调制滤波器组

Designing Uniform and Nonuniform Cosine-modulated Filter Banks Using the Frequency Response Masking Approach

给出了一种均匀非均匀余弦调制滤波器组的设计方法。采用了频率掩蔽法设计原型滤波器,利用迭代算法优化原型滤波器的脉冲响应系数,目标函数表示为脉冲响应系数的四次方,非均匀余弦调制滤波器组通过合并均匀余弦调制滤波器组的相邻的滤波器得到,这种方法简单有效。最后的Matlab实例仿真验证了此算法的有效性。

A method for designing uniform and nonuniform cosine modulated filter banks is presented. This method use the frequency response to design the prototype filter. The objective function is expressed as the fourth - order of the filter coefficients, which is minimized by using the iterative algorithm. The nonuniform CMF banks is derived in association with a uniform CMF bank,each constituent nonuform filter is formed by merging the relevant uniform filters in the associated uniform CMF bank. The method is simple and efficient. A design example is provided to demonstrate the validity of the method.