2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)

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Time-varying allpass filters using spectral-shaped noise for signal decorrelation in stereophonic acoustic echo cancellation
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1273-1276 vol.2
N. Tangsangiumvisai, J.A. Chambers, A.G. Constantinides
In this paper, a signal decorrelation technique is presented that aims to minimise the degradation on stereo signal perception, whilst alleviating the non-uniqueness problem in stereophonic acoustic echo cancellation (SAEC). The proposed technique is based on higher-order time-varying allpass filters (HO-TV-APF) utilising spectral-shaped noise, together with the interpolation method. The test resu... hiện toàn bộ
#Decorrelation #Frequency #Delay #Signal processing #Acoustic noise #Adaptive filters #Equations #Computational complexity #Low-frequency noise #Baseband
Composite PNLMS & NLMS adaptation: a new method for network echo cancellation
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 757-760 vol.2
M. Nekuii, M. Atarodi
This paper describes an improved version of the previously proposed fast converging algorithm, the proportionate normalized least mean squares (PNLMS), for network echo cancellers. We introduce a simple analysis of the PNLMS convergence behavior to show why after the fast initial convergence, it slows down. Also, the method has worked out to overcome this deficiency is presented. The improvement i... hiện toàn bộ
#Echo cancellers #Equations #Convergence #Signal analysis #Algorithm design and analysis #Stability #Speech #Digital signal processing #Eigenvalues and eigenfunctions #Adaptive filters
Synchronous and asynchronous distributed DSP education
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1247-1251 vol.2
M.H. Hayes, J.R. Jackson
The Georgia Tech Regional Engineering Program (GTREP) was originally created to provide the opportunity for students in southeastern Georgia to earn a Georgia Tech undergraduate engineering degree without leaving the region. Students complete two years of general education and engineering prerequisites at their home institutions before beginning the Georgia Tech curriculum as juniors. Georgia Tech... hiện toàn bộ
#Digital signal processing #Educational programs #Computer science education #Production #Libraries #Signal processing #Image processing #Educational technology #Testing #Computer aided instruction
A global gradient descent algorithm for hierarchical FIR adaptive filters
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1285-1288 vol.2
C.G. Boukis, D.P. Mandic
We present an extension of the recently introduced hierarchical least mean square (HLMS) algorithm. The original algorithm suffers from two major drawbacks, namely the incapability to converge for every unknown channel and the dramatic deterioration of its performance as the number of levels increases significantly. To be able to cope with these, a novel global gradient descent algorithm is propos... hiện toàn bộ
#Finite impulse response filter #Adaptive filters #Signal processing algorithms #Convergence #Adaptive signal processing #Eigenvalues and eigenfunctions #Biomedical signal processing #Computational complexity #Least squares approximation #Neural networks
Dynamic grid self-organizing map for clustering of visual evoked potential single trials
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1125-1128 vol.2
M. Stavrinou, S. Papadimitriou, A. Bezerianos, P. Papathanasopoulos
The paper develops a novel learning model of clustering for evoked potential single trials, called dynamic grid self-organized map (DG-SOM) designed according to the peculiarities of evoked potential data. The DG-SOM determines adaptively the number of clusters with a dynamic extension process which is able to exploit class information whenever it exists. Specifically, it accepts available class i... hiện toàn bộ
#Entropy #Data analysis #Physics #Hospitals #Alcoholism #Data mining #Organizing #Pattern analysis #Clustering algorithms #Process control
Wavelet variance analysis of high-resolution ECG in patients prone to VT/VF during cardiac electrophysiology studies
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1133-1136 vol.2
A. Kapela, R.D. Berger, A. Achim, A. Bezerianos
This study evaluates influence of increased heart rate on beat-to-beat variability of vector magnitude depolarisation signal in patients admitted for cardiac electrophysiology studies. Electrical variability is quantitatively assessed during normal sinus rhythm and during atrial pacing by means of the Morlet wavelet transform variance in high-frequency region of 100 Hz to 250 Hz. Results suggest t... hiện toàn bộ
#Wavelet analysis #Analysis of variance #Electrocardiography #Wavelet transforms #Myocardium #Frequency estimation #Heart rate #Circuits #Mathematical model #Physics
Improving the speed and performance of adaptive equalizers via transform based adaptive filtering
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1301-1304 vol.2
M.A. Shamma
Adaptive equalizers are widely used in many communication systems where the channel frequency response characteristics are either time varying or unknown such as the case in wireless and dial up telecommunication networks where the communication channel constantly change due to the different packet routes and switching that takes place, as well as due to the changes in the RF propagation. This wor... hiện toàn bộ
#Adaptive equalizers #Adaptive filters #Discrete Fourier transforms #Discrete wavelet transforms #Fourier transforms #Discrete cosine transforms #Eigenvalues and eigenfunctions #Frequency response #Time varying systems #Communication channels
Limit cycles in embedded high-order, lowpass sigma-delta modulators with distinct NTF zeros
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 1043-1047 vol.2
N. Wong, Tung-Sang Ng
In a related work by the authors, high-order sigma-delta (/spl Sigma//spl Delta/) modulators with distinct noise transfer function (NTF) zeros are decomposed into second-order and first-order subsystems, whose state-trajectories are then investigated by continuous-time embedding. This paper, based on the properties of these subsystems, furthers the study by introducing a scalable numerical method ... hiện toàn bộ
#Limit-cycles #Delta-sigma modulation #Stability #Transfer functions #Matrix decomposition #Nonlinear equations #State feedback #Digital signal processing
JPEG2000 parameters against watermarking
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 713-716 vol.2
V. Fotopoulos, A.N. Skodras
In the paper, the effects of the imminent JPEG2000 compression standard on watermarking techniques are investigated. It is shown that the choice of different coding parameters affects the performance of transform domain watermarking techniques. Compression ratio is of course important but not the only parameter that a watermarking scheme should take into account.
#Watermarking #Image coding #Transform coding #Digital images #Robustness #Discrete cosine transforms #Discrete transforms #Bit rate #Filters #Laboratories
Computational SIMD framework: split-radix SIMD-FFT algorithm, derivation, implementation and performance
2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628) - Tập 2 - Trang 861-864 vol.2
P. Rodriguez V, M.S. Pattichis, R. Jordan
A general framework to develop efficient single instruction multiple data (SIMD) compliant algorithms was previously proposed. In this paper a split-radix SIMD-FFT algorithm is derived under this framework and compared against the radix-2 SIMD-FFT algorithm, proven to have very efficient implementation. Regardless of the intrinsic irregular pattern present in the split-radix algorithm, it is shown... hiện toàn bộ
#Computer architecture #Computational complexity #Registers #Indexing #Costs #Computer aided manufacturing #Microprocessors #Digital signal processing #Wire
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