Acoustic echo control. An application of very-high-order adaptive filters

1999 ◽  
Vol 16 (4) ◽  
pp. 42-69 ◽  
Author(s):  
C. Breining ◽  
P. Dreiscitel ◽  
E. Hansler ◽  
A. Mader ◽  
B. Nitsch ◽  
...  
Keyword(s):  
Adaptive Filters ◽  
High Order ◽  
Acoustic Echo ◽  
Very High

VERY HIGH-ORDER SPATIALLY IMPLICIT SCHEMES FOR COMPUTATIONAL ACOUSTICS ON CURVILINEAR MESHES

2001 ◽  
Vol 09 (04) ◽  
pp. 1259-1286 ◽  
Author(s):  
MIGUEL R. VISBAL ◽  
DATTA V. GAITONDE
Keyword(s):  
Three Dimensional ◽  
Radiation Condition ◽  
Higher Order ◽  
High Order ◽  
High Frequencies ◽  
Decomposition Strategies ◽  
The Impact ◽  
Spurious Modes ◽  
Very High ◽  
Computational Strategy

A high-order compact-differencing and filtering algorithm, coupled with the classical fourth-order Runge–Kutta scheme, is developed and implemented to simulate aeroacoustic phenomena on curvilinear geometries. Several issues pertinent to the use of such schemes are addressed. The impact of mesh stretching in the generation of high-frequency spurious modes is examined and the need for a discriminating higher-order filter procedure is established and resolved. The incorporation of these filtering techniques also permits a robust treatment of outflow radiation condition by taking advantage of energy transfer to high-frequencies caused by rapid mesh stretching. For conditions on the scatterer, higher-order one-sided filter treatments are shown to be superior in terms of accuracy and stability compared to standard explicit variations. Computations demonstrate that these algorithmic components are also crucial to the success of interface treatments created in multi-domain and domain-decomposition strategies. For three-dimensional computations, special metric relations are employed to assure the fidelity of the scheme in highly curvilinear meshes. A variety of problems, including several benchmark computations, demonstrate the success of the overall computational strategy.

Very-high-order weno schemes

2009 ◽  
Vol 228 (23) ◽  
pp. 8481-8524 ◽  
Author(s):  
G.A. Gerolymos ◽  
D. Sénéchal ◽  
I. Vallet
Keyword(s):  
High Order ◽  
Weno Schemes ◽  
Very High

scholarly journals Computer-Controlled Test System for the Excitation of Very High-Order Modes in Highly Oversized Waveguides

2019 ◽  
Vol 40 (3) ◽  
pp. 257-268 ◽  
Author(s):  
T. Ruess ◽  
K. A. Avramidis ◽  
G. Gantenbein ◽  
Z. Ioannidis ◽  
S. Illy ◽  
...  
Keyword(s):  
Test System ◽  
High Order ◽  
Oversized Waveguides ◽  
Computer Controlled ◽  
Very High
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