A Note on General Parallel QMF Banks

Theory and Design of Uniform DFT, Parallel, Quadrature Mirror Filter Banks

AbSfrUCf -In this paper, the theory of uniform DFI, parallel, quadrature mirror filter (QMF) banks is developed. The QMF equations, i.e., equations that need to be satisfied for exact reconstruction of the input signal, are derived. The concept of decimated filters is introduced, and structures for both analysis and synthesis banks are derived using this concept. The QMF equations, as well as c...

Convergence results on the design of QMF banks

This paper considers the design of quadrature mirror lter (QMF) banks whose analysis and synthesis lters are FIR and have linear phase. The design criterion is of least-squares type. An iterative computation algorithm is proposed, and its convergence is proven that ooers new insight to the design of QMF banks, and relates it to a more general nonlinear optimization problem.

An improved method for the design of FIR quadrature mirror-image filter banks

A new method for the design of general finiteduration impulse response (FIR) quadrature mirror-image filter (QMF) banks that eliminates the computation of large matrices is proposed. The design problem is formulated to include low-delay QMF banks, which are highly desirable in some applications. The paper concludes with design results and comparisons that show that conventional QMF banks can be...

Hexagonal Qmf Banks and Wavelets Hexagonal Qmf Banks and Wavelets

New algorithm for QMF banks design and its application in speech compression using DWT

This paper presents a new algorithm for designing Quadrature Mirrors Filters (QMF) banks using windowing techniques. In the proposed algorithm the cut off frequency of the prototype filters is iteratively varied such that the perfect reconstruction at frequency (ω=0.5π) in ideal condition is approximately equal to 0.707. The designed QMF banks are used as mother wavelet for speech compression a...