منابع مشابه
Vector Multirate Filtering and Matrix Filter Banks
Multichannel or multi-input multi-output multirate filtering is discussed in this paper. Vector multirate systems are defined, and the issues of aliasing cancellation and perfect reconstruction are addressed in the vector context. The conditions for a vector linear periodically time-variant system to become time-invariant are derived. The idea of doubly complementary filters is generalized to t...
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Abs#ruct-Multirate filter banks produce multiple output signals by filtering and subsampling a single input signal, or conversely, generate a single output by upsampling and interpolating multiple inputs. Two of their main applications are subband coders for speech processing and transmultiplexers for telecommunications. Below, we derive a theoretical framework for the analysis, synthesis, and ...
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Anticausal or time-reversed inversion of digital filters has gained importance in recent years in the implementation of digital filter banks. Anticausal inversion has, in the past, been shown to be possible by using block processing with appropriate state initialization. With (A, B , C , D) denoting the state space description of a structure implementing a filter G(z), the anticausal inverse ca...
متن کاملCosine Modulated Structures for Rational Multirate Filter Banks
We propose a new structure for rational multirate filter banks (FBs) using cosine modulation. More precisely, the proposed structure is intended to realize a critically sampled subband analysis where the L subbands are allowed to have bandwidths given by integer ratios pi/qi, provided that ∑L i=1 pi/qi = 1. We show that within our construction there exist FIR solutions allowing perfect reconstr...
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A new unified method for designing both paraunitary cosine-modulated FIR filter banks and cosine-modulated wavelets is proposed in this paper. This problem has been formulated as a quadratic-constrained least-squares (QCLS) minimization problem in which all constraint matrices are symmetric and positive definite. Furthermore, a specific analog neural network whose energy function is chosen as t...
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ژورنال
عنوان ژورنال: American Journal of Applied Sciences
سال: 2008
ISSN: 1546-9239
DOI: 10.3844/ajassp.2008.788.797