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This paper analyses the contribution of optimized PLP feature extraction setup and application of feature normalization to improve the performance of automatic speech recognition system for data compressed by MP3 algorithm. The experimental study performed on loop-digit recognition and large vocabulary continues speech recognition task showed that proper setup can negate the effect of lower compression...
This paper aims at compensating the dead-time effects in the vector-controlled induction motor system. It is used a feed-forward approach for the fundamental compensation and a feedback loop with adaptive GM filter and PI controllers for a harmonic compensation. The simulation results demonstrate the effectiveness of the proposed compensation strategy.
This paper deals with the design of the compact version of Cartesian Genetic Programming. The focus is given to the search algorithm of type (1+1). The paper presents the approach that detects changes in the phenotype and, based on that, the algorithm can omit the evaluation of a candidate solution. The author uses the evolutionary design of multipliers as benchmark to present the efficiency of the...
A desktop based real time oxygen auto-ventilation and gas monitoring system is proposed for home care respiratory application. The system consists of four sub-systems: oxygen monitoring system, oxygen ventilation system, gas monitoring system, and data transfer system. An oximeter transmits arterial oxygen saturation level and heart rate to the desktop unit via Bluetooth. Based on the oxygen saturation...
The contribution investigates the impact of frequency feature optimization on discriminating between movement-related EEG realisations associated with right shoulder elevation and right index finger flexion movements. Exhaustive search of subbands in the range from 5 to 45 Hz is performed. A classifier based on Hidden Markov Models is utilised. The results show a large variability of optimal settings...
The HART protocol is a specification designed for industrial process automation and control. In this paper we provide the design and implementation of the communication module with HART protocol. The primary objective of the designed hardware is to minimize current consumption so that the module is powered by a 4–20 mA current loop. The employed parts have also been selected with regard to the minimum...
Embedded systems are often used for special purposes. When an embedded system is operating in a critical environment, its reliability should be focused on. One of the methods for improving reliability of embedded systems is Control-flow checking (CFC) of the running program. It is known that the control-flow errors comprise between 33% and 77% of all errors in a computer system [1]. Nowadays there...
Digital filters are necessary in digital transmitter / receiver side and popularity of Software Defined Radio (SDR) is forcing complex digital signal processing blocks to be implemented in parallel design flow on FPGA or ASIC. The goal of this paper is to develop efficient pipelined polyphase FIR filter structures in VHDL language for RTL synthesis on FPGA. The proposed structures contain fully parallel...
The paper deals with investigation of novel B3C converter which can be utilized as a part of power semiconductor system in traction, automotive, or industrial applications like renewable energy sources. Proposed solution of main circuit of B3C converter is based on buck-boost topology (BB), whereby energy transfer from source to load and vice versa is possible - bidirectional converter (B). Due to...
This paper deals with the development of methodology suited for design of computation algorithm which is able to determine power losses of electronic systems based on measured temperature distribution. Second part of paper is given to development of methodology for optimal selection of mentioned active components for thermal simulation model of given electronic system. Finally experimental verification...
The moving object can be described, based on frequency analysis and segmentation process. The moving objects are captured by highspeed video camera and image analysis is necessary for evaluation. This fact is very important in medical applications, when the moving objects (cilias) are needed to determine patient's diagnosis. The artifacts (moving detrit, bubles) must be removed from analysis result...
The objective of this paper is to present a highly customizable wireless monitoring solution for monitoring of environment characteristics, to evaluate propagation characteristics of wireless signal in inhabited buildings and to discuss important aspects of wireless monitoring systems. We have designed home monitoring system that uses ZigBee wireless sensor network with 8-bit microcontrollers and...
This article deals with the question to what extent the automotive standard for functional safety ISO 26262 is also applicable to motorbikes. It examines thereby, on the one hand where to find comparable criteria between cars and motorbikes from the standpoint of functional safety, and, on the other hand, where differences between the automobile and the motorbike must be considered. It shows the extent...
Computation complexity of a broad variety of practical design problems is known to be strongly depending on an imagination about the particular real-world situation. The contribution is based on the fact that our knowledge of reality is always incomplete. The proposed approach is based on the idea that new knowledge can be gained by comparison using the requirement of consistency of different physical,...
Quadrature oscillator based on the operational transresistance amplifier (OTRA) is presented in this paper. The proposed quadrature oscillator circuit uses two OTRAs as main active building blocks and a few external passive components to generate the oscillations. The circuit provides independent control over the condition of oscillation and frequency of oscillation. A prototype circuit is implemented...
The quantum computing represents a new field, which is still being researched, that may have numerous applications in the computer arithmetic, in the encryption - decryption systems, rapid search algorithms and physical systems' emulations. The hardware device that can make this type of calculations is still expensive nowadays and the number of the manufacturers is reduced. On the other hand, the...
This paper investigates topologically independent vector modulation for multilevel converters. The investigate vector modulation is Space Vector PWM (SVPWM) which was implemented in FPGA and also tested in development board MLC interface with low-voltage prototype of three-level Neutral Point Clamped (3L-NPC) converter. The main advantages and disadvantages which were found out during implementation...
This paper describes control algorithm for the controlled single-phase H-bridge power inverter with LCL filter. The LCL type of the filter provides significant reduction of the current ripple. On the other hand the stability of the circuit is reduced as well, especially the current control stability which is the reason for double current control implementation. This solution provides direct current...
Construction and technical condition of current collectors is crucial to reliability and safety of railway transportation. According to the Technical Specifications for Interoperability railway vehicles in the European Union should be equipped with carbon contact strips. Excessive wear or defects of contact strips degrade the capability of undisturbed power transmission, cause faster wear of contact...
Mean arterial pressure (MAP) is the pressure in the arteries averaged over time. Oscillometric blood pressure (BP) monitors determine the value of MAP by processing arterial pulses in the cuff. Cuff pressure at the point of largest pulse amplitude is equal to MAP. The oscillometric determination of MAP is subject to errors resulting from wave reflections and stroke volume variability. We developed...
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