Design of oversampled cosine-modulated filter banks satisfying perfect reconstruction
毕厚杰 · Journal of China Institute of Communications · 2001
The constraints of oversampled cosine-modulated filter banks with perfect reconstruction(PR) are firstly educed in this paper. Because its constraints are less than that in the critically sampled case, we can lead to PRLP prototypes with stopband attenuation being much higher than that in the critically sampled PR case.Then we present a method for designing prototype filter based on an quadratic-constrained minimization problem.The solution of the minimization problem converges very quickly since the cost function as well as the constraints are quadratic functions with respect to the unknown parameters. Compared with other design methods, the proposed technique yields PR filter banks with much higher stopband attenuation.