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The performance of underwater acoustic target recognition system decreases significantly mainly due to the complex underwater acoustic conditions. Nevertheless, human auditory system is capable of segregating different targets in noisy conditions. Several auditory-based features have been applied to underwater acoustic target recognition, but only represent amplitude of the signal. However, phase...
An expression is derived for the error variance of transfer function of a Two Dimensional system due to FWL errors, The optimal realization problem is then formulated by minimizing this variance with respect to all possible realizations of the system. This problem is shown to be equivalent to the minimization of a pure L2 norm based sensitivity measure ML2, and can be sieved using any standard minimization...
In this paper, a novel lattice network-based structure is derived for a canonic realization of recursive digital filters. For an Nth order filter, unlike the existing lattice structures the proposed structure has 2N free parameters that can be used to improve the structure properties. The relationship between the transfer function coefficients of the filters and the parameters of the proposed structure...
In this paper, based on a matrix factorization a novel structure is proposed for digital system implementation and adaptive filtering applications. The equivalent state-space realization of such a structure is an input-balanced realization. Like the normalized lattice structure, it contains a series of Givens rotations. This proposed structure is simpler than the normalized structure and can be implemented...
The excellent finite wordlength property of the lattice digital filter is well known. The four-multiplier normalized lattice, with signal power at all delay elements normalized to unity, has particular advantage in its overflow property. However, when used to implement an Nth order digital filter, the normalized lattice implementation requires 5N +1 multipliers. In this paper, we present a novel lattice...
In this paper, a novel structure is derived for digital filter which is robust against the FWL errors. This structure, denoted as SIMP, is actually an improved version of the one reported in the work of Li et al. (2000) in terms of implementation efficiency and reducing quantization errors. The expression of transfer function sensitivity measure is derived for each structure. Two numerical examples...
In this paper, based on a new parametrization of the input-balanced realizations a novel structure is proposed for implementation of 2nd order digital filters. Like the normalized lattice structure, it contains a Givens rotation. The expression of roundoff noise gain for this structure is derived. This proposed structure is simpler than the normalized structure. Though having the same number of structure...
In this paper, a new approach to speech signal synthesis is proposed. The basic idea is to represent a speech signal as the impulse response of a pole-zero digital filter. The transfer function of the digital filter is obtained using the effective balanced model reduction (BMR) technique. Extensive simulations are done to demonstrate the performance of the proposed approach for speech signal representation,...
As shown in [9], for a state-space realization (A,B,C,d) of a digital Alter there are no self-sustained oscillations (i.e., limit cycles) if there exists some diagonal matrix D > 0 such that D-AT DA ges 0. Based on this result, we show that the optimal roundoff realizations are free of limit cycles. For any given realizations, a method is proposed to check the existence of such a D. A novel class...
Input-balanced realizations (IBR) are a very important class of digital filter representations. In this paper, four IBR- based digital filter structures are compared in terms of roundoff noise behavior. Our main contribution is twofold. The first one is to derive a novel digital filter structure, denoted as Rnew, which is in fact an improved version of the structure Rlgs proposed in [8]. The second...
In this correspondence, a novel digital filter structure is derived using matrix factorization. This structure, called the LCW-structure, is an improved version of the so-called LGS-structure proposed by Li, Gevers, and Sun [ldquoPerformance Analysis of a New Structure for Digital Filter Implementation,rdquo IEEE Transactions on Circuits and Systems I, vol. 47, no. 4, pp. 474-482, April 2000]. For...
Based on the structured singular value theory, a tractable stability measure is derived for controllers/filters with the finite word length implementation consideration. The optimal realizations of controllers/filters are defined as those that maximize this measure. A sophisticated optimization strategy is presented to provide an efficient method for solving this problem based on the linear matrix...
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