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Time series forecasting techniques have been widely applied in domains such as weather forecasting, electric power demand forecasting, earthquake forecasting, and financial market forecasting. Because of the fact that these time series are affected by a multitude of interrelating macroscopic and microscopic variables, the underlying models that generate these time series are nonlinear and extremely...
Trigonometric functions are slow and need a lot of resources to run on embedded systems. How can we calculate these functions in a more efficient way of resources and faster? In this paper we present the implementation on FPGA of the CORDIC algorithm to calculate the sine, cosine, arctangent and vector magnitude. The CORDIC IP (Intellectual Property) is described generically in Vhdl and Handel-C....
This paper presents an analysis of issues related to the resolution of the biometric data of the speech signal processing implemented using fixed-point digital signal processor. Implementation calculations were made using the module with the commissioning of the TMS320C5515 processor, which can be programmed with the use of Code Composer Studio (CCS) environment. We shown features of C5515 digital...
In this paper we present a simple but effective technique to help the designer of a voice-operated appliance add out-of-grammar command rejection capabilities, with a minimal effort and without overly degrading the recognition accuracy. Given the desired operational grammar of the appliance, and starting from a generic pre-trained acoustic model and comprehensive dictionary, we use a speech recogniser...
Video coding standards: AVS China, H.264/MPEG-4 PART 10, HEVC (high efficiency video coding a.k.a. H.265), VP9 (Google), DIRAC (BBC) and VC-1 (SMPTE) are presented. HEVC is the latest standard developed by ITUT and ISO/IEC. Encoder/decoder functionalities along with advantages/applications are discussed. Open source software, ftp/web sites, standards documents, review papers, conformance bit streams,...
Starting from a well known algorithm of cubic spline interpolation utilized in image processing it was developed a new one that utilize B-spline functions and their derivatives. The new algorithm is implemented on a system with digital signal processor. There are presented some issues and limitations that appear when using a digital signal processor. The main goal is to verify if the new algorithm...
With decreasing minimum feature size, nano-electronic circuits and systems exhibit an increasing variety of defect and fault mechanisms. Their rising sensitivity to radiation- and coupling induced single and multiple event upsets is one problem, new or enhanced aging processes that may lead to early-lifetime failures pose another threat. The compensation of transient fault effects is a well explored...
The paper presents issues of time-delay estimation with application to the direction of sound arrival. The example shows that in the case of voice sources the percentage of correct GCCPHAT estimates is not acceptable. The proposed averaging filter significantly reduces the errors. The dependency of the timedelay estimation accuracy is experimentally evaluated.
An adaptive minimum selection combining (MSC) scheme is proposed for time varying, intersymbol interference fading communication channel in presence of impulsive noise. The receiver adaptively selects and combines minimum number of diversity branches to reduce the complexity and to save the power. We use the maximum likelihood (ML) metric to choose the branches instead of the instantaneous signal...
This paper presents different, well-known Bussgang algorithms for blind equalization in a real-time environment. The most commonly used Bussgang algorithms based on the constant modulus algorithm (CMA), decision directed modulus algorithm (DDMA) or decision directed algorithm (DDA). They offer different performance concerning convergence rate and steady state mean square error. Utilizing hybrid-algorithms...
Spatial diversity is one of the most efficient techniques used to overcome fading in wireless systems which can be accomplished by cooperative communication. Cooperative communication describes strategies to transfer data from the source to the destination by employing relay nodes between them. In this paper a relay selection algorithm is proposed where one relay is chosen based on instantaneous signal...
IEEE SPA Conferences grew up from the Signal Processing (SP) Workshops organized by the Polish IEEE Circuits and Systems Chapter (CAS Chapter for short) since 1993. Starting with the second ten of the SP Workshops, the name of the meetings was supplemented by a subtitle: “Algorithms, Architectures, Arrangements, and Applications” and since that time we have four reasons to use the abbreviation SPA...
In this paper we propose efficient smoke and flame detection algorithms for intelligent video surveillance systems. Our algorithms consider dynamic and static features of smoke and flame: contrast, color, texture features and motion. For smoke detection the approach uses motion and contrast as the two key features of smoke. Motion is a primary sign and is used at the beginning for extraction from...
Language modeling for an inflected language such as Arabic poses new challenges for automatic speech recognition and related topic due to its rich morphology. A new technique for automatic speech recognition is presented in this paper. This technique employs a full measure of statistical dependence among random variables that is known as copulas. A novel probabilistic classifier that combines finite...
For several decades, researchers have heatedly debated the statistical properties of real-world time series. On one end of the spectrum, researchers put forward that the majority of the real-world time series are nondeterministic and that some of them exhibit ‘random walk’; these researchers advocate that real-world time series are unpredictable. On the other end of the spectrum, researchers have...
The Quality of Experience (QoE) concept for video content used for entertainment differs significantly from the QoE of surveillance video used for recognition tasks. Consequently, the latter requires specific reference video database sets for research. In this paper, such a database is described. The paper reports the process of preparing test video sequences and related subjective scores. It also...
In this paper some of compliance tests advised by IEEE Standard for Synchrophasor Measurements for Power Systems are conducted upon the phasor estimated by Interpolated DFT (IpDFT) Bertocco-Yoshida (BY) order 1 algorithm with spectral leakage correction. The results are compared with well-known two-point IpDFT with Hann window. Steady-state and dynamic compliance tests showed very good results for...
This paper describes a new multilevel-decomposition method for the blind source separation of convolutive image mixture. The proposed method uses an Adaptive Quincunx Lifting Scheme based on wavelet decomposition and a geometric unmixing algorithm. It proceeds in three steps. In the first step, the mixed signals are decomposed by an adaptive lifting scheme. The unmixing algorithm therefore applied...
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