This paper proposes a new method for online secondary path modeling in active noise control systems. The existing methods systems with consist of three adaptive filters. main feature the proposed is that it uses only two In method, modified-FxLMS (MFxLMS) algorithm used adapting filter and variable step size (VSS) least mean square (LMS) adaptation filter. VSS LMS different from normalized-LMS (NLMS) algorithm, where varied accordance power reference signal. Here, on other hand, disturbance...

This paper presents a new expression of the variance roundoff noise in 2-D separable denominator digital filters described by Roesser's local state-space model. The covariance matrices and necessary to analyze under <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1_2</tex> norm scaling are obtained as solutions Liapunov equations. synthesis problem with minimum formulated scaling. method realizations is proposed applying minimization technique...

We report on the quantum criticality of ${\mathrm{YbCu}}_{4}\mathrm{Ni}$ as revealed by our combined micro- and macro-measurements. determine crystal structure with site mixing neutron diffraction measurements, which suggests possible presence Kondo disorder. However, decreasing local spin susceptibility distribution development fluctuations below 10 K at ambient pressure muon rotation relaxation measurements that exhibits criticality. Therefore, experimental results indicate is a material...

Magnon spin currents in the ferrimagnetic garnet Tb3Fe5O12 with 4f electrons were examined through spin-Seebeck effect and neutron scattering measurements. The compound shows a magnetic compensation, where signal reverses above below Tcomp = 249.5(4) K. Unpolarized unveils two major magnon branches finite energy gaps, which are well-explained framework of spin-wave theory. Their temperature dependencies direction precession motion moments, i.e. polarization, defined using polarized neutrons,...

This paper studies the roundoff noise and scaling in 2-D state space digital filters. The matrix covariance case are derived. They expressed with double infinite sums or integral. A formulation is presented to synthesize minimum practical synthesis procedure also provided. numerical example given show analysis method here.

In active noise control (ANC) systems, the online secondary path modeling (OSPM) methods that use additive random are often applied. The noise, however, contributes to residual and thus deteriorates performance of ANC systems. This paper proposes a new OSPM method with power scheduling noise. Here filter is adapted using variable step size (VSS) LMS algorithm already proposed by authors. Furthermore, additive-random-noise scheduled based on convergence status an system. Computer simulations...

This paper proves that any single-input/single-output (SISO) 2-D system with a separable denominator can be decomposed into pair of 1-D systems having dynamics in different directions and the minimal decomposition is unique modulo an invertible constant transformation. One single-input/multi-output other multi-input/single-output system. On basis reduceddimensional decomposition, which directly connects separabledenominator to two systems, studies state-space realizations...

The paper proposes a new method for online secondary path modeling in active noise control (ANC) systems. proposed is modified version of the basic method, by L.J. Eriksson and M.C. Allie (1989). objective to realize improved performance at reasonable computational cost. filter adapted using same error signal as used adaptation filter. Furthermore, variable step size (VSS) LMS algorithm adapt idea VSS stems from fact that disturbance desired response decreasing nature, (ideally) converging...

This letter proposes a synthesis method for low coefficient sensitivity second-order IIR digital filter structures using genetic programming with automatically defined functions (GP-ADF). In this letter, are represented as S-expressions subroutines. It is easy to generate syntactically valid and perform the operations, because representation suitable GP. A numerical example uses fitness measure, including magnitude sensitivity, demonstrates that proposed can synthesize efficiently very structures.

The paper proposes a technique for the design of 2-D separable-denominator digital filters. is based on decomposing both state-space models and given impulse response specifications into 1-D ones. It proved that can be optimally decomposed via singular value decompositions. Then, filters are designed to approximate specifications. By using balanced approximation as algorithm, practical algorithm presented stable computationally efficient numerically stable.

This paper presents a theorem for the absence of limit cycles in class state-space digital filters. Such contains minimum noise realizations any order as special case, that is, it is proved transition matrix A satisfies <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I - A^{t}A \geq 0</tex> , and thus are free cycles.

In this paper, we propose a novel bicubic method for digital image interpolation. Since the conventional does not consider local features, interpolated images obtained by often have blurring problem. proposed adopts both asymmetry features and gradient of an in interpolation processing. Experimental results show that can obtain high accuracy images.

This paper proposes a new structure for feedforward active noise control (ANC) systems with online secondary path modeling. The proposed method: 1) uses the same error signal updating process as used modeling and 2) incorporates an adaptive filtering averaging based filtered-reference algorithm in process. computer simulations have been conducted both narrowband broadband signals. It is shown that ANC system residual secondary-path-modeling can be reduced at faster convergence rate than...

This paper proposes a closed form solution to L2-sensitivity minimization of second-order state-space digital filters. Restricting ourselves the case filters, we can express by simple linear combination exponential functions and formulate problem polynomial equation. As result, be converted into find fourth-degree equation constant coefficients, which algebraically solved in without iterative calculations.

This paper presents a synthesis method for infinite-impulse response (IIR) digital filter structures using genetic programming with automatically defined functions (GP-ADF). In the proposed method, are represented as S-expressions subroutines, which written directly from set of difference equations. also shows condition constructing that represent without delay-free loops. Numerical examples synthesize two-filter structures: low-coefficient sensitivity fourth-order structure and low-output...

Our recent results in the design of high tuning accuracy variable IIR filters are given this work. The and range increased by minimization sensitivity structures (real complex) used developing new method based on cascaded identical sub-filters. Several multioutput second-order digital filter sections also proposed. All theoretical derived verified experimentally.

This letter proposes a method for active noise control (ANC) systems with online acoustic feedback neutralization. The proposed is modified version of authors' previous work, and the objective here to reduce computational complexity. achieved by combining role path modeling neutralization filters. computer simulations are carried out which demonstrate that achieves better performance than existing methods at somewhat reduced cost.

NH-bridged and pyrazine-fused metallodiazaporphyrin dimers have been prepared from nickel(II) copper(II) complexes of 3-amino-5,15-diazaporphyrin by Pd-catalyzed C-N cross-coupling oxidative dimerization reactions, respectively. The synergistic effects the nitrogen bridges meso-nitrogen atoms play major roles in enhancing light-harvesting properties delocalization an electron spin over entire π-skeletons dimers.

The authors propose a technique for designing 2-D digital filters (2DDFs) with specified magnitude and constant group delay characteristics. method is based on the iterative singular value decomposition (ISVD) of specification matrix. ISVD guarantees all its results to be always nonnegative. By using ISVD, specifications can decomposed into pair 1-D ones, thus problem 2DDF reduced one 1DDFs or even only 1DDF. A design example shows that this used 2DDFs higher degree precision but needs less...

This paper proposes a new method for active noise control systems with online secondary-path modeling. The main features of the proposed are that modified-FxLMS (MFxLMS) algorithm is used in adapting filter and variable step-size (VSS) LMS modeling filter. varied accordance power residual error signal (the desired response filter). It found corrupted by which decreasing nature, (ideally) converging to zero. Hence, small initially later its value increased accordingly. Computer simulations...

Magnetic structures of the noncentrosymmetric magnet Sr 2 MnSi O 7 were examined through neutron diffraction for powder and single-crystalline samples, as well magnetometry measurements. All allowed magnetic space group P 4 1 m with wavevector q = (0, 0, ½) refined via irreducible representation analyses. The compound was to have in-plane moments within Cmc .1′ c (No. 36.177) under zero field, which can be altered 19.28) above μ 0 H 0.067 (5) T align induced weak-ferromagnetic components one...

This paper proposes a closed form solution to L2-sensitivity minimization of second-order state-space digital filters subject L2-scaling constraints. The proposed approach reduces the constrained optimization problem an unconstrained by appropriate variable transformation. Furthermore, restricting ourselves case filters, we can express simple linear combination exponential functions and formulate polynomial equation. As result, is expressed in closed, form, its constraints achieved without...

This paper reveals the class of digital filters with all second-order modes equal. We first prove that if a filter are equal, <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</i> <sub xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -sensitivity minimization problem can be solved analytically. derive general expression transfer function Furthermore, we show is obtained by frequency transformation on first-order prototype FIR filter.

The authors have already proposed evolutionary digital filters (EDFs). EDF is an adaptive filter which controlled by algorithm based on the strategies of living things. It consists many linear/time-variant inner correspond to individuals. output fitness maximum in population. EDFs controls and changes coefficients using cloning method (the asexual reproduction method) or mating sexual method). This a non-gradient multi-point search algorithm. Thus, this not susceptible local minimum problems...