2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Improving the speed and performance of adaptive equalizers via transform based adaptive filtering
Tập 2 - Trang 1301-1304 vol.2
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......
#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
Recursive non parametric spectral estimation from irregularly sampled observations
Tập 2 - Trang 799-802 vol.2
In this paper, the nonparametric spectral analysis of a randomly sampled signal is discussed. In particular, a class of estimators is introduced: the IRINCORREL class. This class is composed of recursive algorithms which both take into account the sampling irregularity and the correlation of the signal values. The study of the mean square estimation error shows that there is a trade off between bi......
#Recursive estimation #Sampling methods #Spectral analysis #Signal processing algorithms #Frequency #Random variables #Large Hadron Collider #Estimation error #Convergence #Signal processing
On the modified weighted vector median filter
Tập 2 - Trang 939-942 vol.2
A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented. The computational complexity of the new filter is significantly lower than that of the weighted vector median filter (WVMF). The comparison shows that the new filter outperforms the WVMF, as well as other standard procedures used in color image filtering for the removal......
#Color #Noise reduction #Educational institutions #Strontium #Colored noise #Tiles #Ear #Digital signal processing #Nonlinear filters #Length measurement
Limit cycles in embedded high-order, lowpass sigma-delta modulators with distinct NTF zeros
Tập 2 - Trang 1043-1047 vol.2
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 ......
#Limit-cycles #Delta-sigma modulation #Stability #Transfer functions #Matrix decomposition #Nonlinear equations #State feedback #Digital signal processing
Analysis of long-range correlations in geoelectrical signals measured in southern Italy
Tập 2 - Trang 911-915 vol.2
We investigate, by detrended fluctuation analysis (DFA), the long-range correlations in the time series of the hourly mean geoelectrical signals measured during 1995-1996 at the Tramutola station, located in one of the most seismically active areas of southern Italy. Scaling behaviour has been found in the time series of self-potentials. Characterizing the temporal fluctuations of the geoelectrica......
#Signal analysis #Earthquakes #Fluctuations #Area measurement #Time measurement #Doped fiber amplifiers #Information analysis #Signal processing #Time series analysis #Seismic measurements
On the use of PCA in GMM and AR-vector models for text independent speaker verification
Tập 2 - Trang 595-598 vol.2
This paper examines the role of the principal components analysis (PCA) on the performance of two classification systems for text independent speaker verification: the Gaussian mixture model (GMM) and the AR-vector model. The use of the PCA transform resulted in an improvement in the performance of the GMM for training times of 60 s and 30 s. However, the advantage of using PCA was not observed fo......
#Principal component analysis #Hidden Markov models #Speech #Training data #Testing #Loudspeakers #Speaker recognition #Covariance matrix #Error analysis #Telephony
A scheduling scheme for multiplexing extra streaming data into digital TV programs
Tập 2 - Trang 579-582 vol.2
In digital TV systems, variable bitrate encoding is usually used to improve the bandwidth usage efficiency. Since the transmission channel has a fixed bandwidth, this leaves some portions of the bandwidth unoccupied. This free space can be used to transmit extra data to enhance the TV content, which can be either discrete, like text, or streaming, like video and audio. We address the problem of ad......
#Digital TV #Streaming media #Bandwidth #Scheduling algorithm #Decoding #Delay #Bit rate #Processor scheduling #TV receivers #Quality of service
The application of symplectic geometry on nonlinear dynamics analysis of the experimental data
Tập 2 - Trang 1137-1140 vol.2
For nonlinear dynamic analysis of the experiment data, one often uses SVD decomposition to reconstruct embedding dimension of attractor because of its simpleness. However, it is hardly for singular value decomposition (SVD) decomposition to get good results in the attractor reconstruction of the experiment data. For this, symplectic geometry method is proposed to estimate embedding dimension of re......
#Geometry #Nonlinear dynamical systems #Delay effects #Electromyography #Surface reconstruction #Chaos #State-space methods #Time series analysis #Data analysis #Mechatronics
Heart period dynamics following an asphyxia experiment in rats
Tập 2 - Trang 1165-1168 vol.2
The present work proposes an optimal symbol dynamics transformation as an approach to analyze dynamic aspects of heart rate variability (HRV) in an asphyxia experiment in rats. The approximate entropy (ApEn) was used to quantify the regularity of short symbolic sequences derived from 5 min R-R intervals (RRI). The comparison of several symbol transformations applied in HRV analysis indicates our a......
#Asphyxia #Rats #Heart rate variability #Entropy #Electrocardiography #Nonlinear dynamical systems #Cardiology #Time measurement #Rail to rail inputs #Heart rate
Time-varying allpass filters using spectral-shaped noise for signal decorrelation in stereophonic acoustic echo cancellation
Tập 2 - Trang 1273-1276 vol.2
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......
#Decorrelation #Frequency #Delay #Signal processing #Acoustic noise #Adaptive filters #Equations #Computational complexity #Low-frequency noise #Baseband