2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628)
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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
Probabilistic neural networks combined with GMMs for speaker recognition over telephone channels
Tập 2 - Trang 1081-1084 vol.2
We study the applicability of probabilistic neural networks (PNNs) as core classifiers to medium scale speaker recognition over fixed telephone networks. In particular, banking applications with up to 400 enrolled speakers and short training times are targeted. Two PNN-based open-set text-independent systems, for speaker identification and speaker verification, respectively, are presented. The per......
#Neural networks #Speaker recognition #Telephony #Mel frequency cepstral coefficient #Speech #Training data #Working environment noise #Laboratories #Banking #Wideband
Shape description by image foresting transform
Tập 2 - Trang 1089-1092 vol.2
The image foresting transform (IFT) is a unified and effective graph-based approach to the design of image-processing operations, often with considerable efficiency gains over published algorithms. This paper extends the applications of the Euclidean IFT to two recently proposed shape descriptors: saliences and multiscale fractal dimension. It explains how to obtain the salience information and th......
#Shape #Fractals #Pixel #Skeleton #Robustness #Cost function #Physics computing #Process design #Algorithm design and analysis #Filtering
A possible genetic-algorithm based method for optimizing a class of ANN transfer functions
Tập 2 - Trang 1353-1356 vol.2
This paper proposes a hybrid of two methods to determine the weight-constants in a class of artificial neuron networks, ANNs. The class of ANNs we are interested in are characterized by feed-forward processing elements. One of the methods is the genetic algorithm, GA; the other is "training through" back-propagation of the error, BPE. We expect our hybrid scheme to be faster than using BPE alone.
#Optimization methods #Transfer functions #Artificial neural networks #Circuits #Neurons #Genetics #Backpropagation #Resource management #Weight measurement #Error correction
A timing recovery criterion derived from the tap weights of a decision feedback equalizer for QAM digital subscriber line systems
Tập 2 - Trang 1281-1284 vol.2
In this paper a timing recovery criterion is derived from the optimum feedforward coefficients of an adaptive symbol-spaced complex-valued decision feedback equalizer (DFE). The criterion is deduced by evaluating the relationship of sampling phase and corresponding, in the minimum mean square error (MMSE) sense optimum, equalizer tap weights exemplarily for a typical digital subscriber line (DSL) ......
#Decision feedback equalizers #Quadrature amplitude modulation #DSL #Sampling methods #Filters #Timing jitter #Field-flow fractionation #Signal to noise ratio #Signal processing #Transceivers
Application of JPEG 2000 compression in medical database image data
Tập 2 - Trang 539-542 vol.2
A medical database has been developed in the pediatric clinic of the University Hospital of Alexandroupolis in order to organize and manipulate all clinical information in digital form. A compression technique that trades between the amount of data stored/transmitted and the quality of the image may be used in order to reduce the amount of stored/transmitted image data. A comparative evaluation of......
#Transform coding #Image coding #Biomedical imaging #Image databases #Medical diagnostic imaging #Hospitals #Laboratories #Clinical diagnosis #X-ray imaging #Spatial databases
A programmable image signal processing architecture for embedded vision systems
Tập 2 - Trang 1269-1272 vol.2
This paper presents a programmable multiprocessor architecture suitable for image preprocessing in embedded vision systems. The architecture is made up of sixteen 16-bit input/32-bit output parallel processing elements, connected to an intelligent DMA channel and frame buffers. Each element of the SIMD processing array can be programmed using a RISC-like instruction set, and is capable of performi......
#Signal processing #Machine vision #Intelligent sensors #Clocks #Frequency estimation #Parallel processing #Digital signal processing #Signal processing algorithms #Prototypes #Field programmable gate arrays
Channel tracking for space-time block coded systems using particle filtering
Tập 2 - Trang 671-674 vol.2
In space-time block coded systems, the channel responses are assumed to be quasi-stationary. However, in many situations, this may not be the case and yields unsatisfactory performance. Therefore, there is a need to address the problem by tracking the channel responses in some way. We propose the use of particle filters for tracking the channel responses in space time coded systems. Compared to th......
#Particle tracking #Space time codes #Gaussian noise #Transmitting antennas #Particle filters #Receiving antennas #Bit error rate #Filtering algorithms #Kalman filters #Biomedical signal processing
Impulse noise removal on an embedded, low memory SIMD processor
Tập 2 - Trang 1257-1260 vol.2
Vector median filters efficiently reduce noise while preserving image details. However, their high computational complexity for color images makes them impractical for real-time systems. We propose new computationally efficient filtering algorithms, called index mapping filters (IMF). These filtering algorithms are accelerated by implementing them on a massively data parallel processor array. In a......
#Filters #Color #Noise reduction #Filtering algorithms #Clocks #Computational complexity #Real time systems #Acceleration #Computational efficiency #Noise robustness