The purpose of this paper is to present several filter topologies used for decimation of sigma delta modulated digital signals in order to choose the optimized filter architecture with regards to an efficient implementation. The filter is suited for data conversion and measurement applications. A second order 1-bit sigma delta modulator will be considered as the front-end A/D converter. The subsequent digital filter reduces the sampling rate by a factor of 64 and must guarantee a stop band attenuation of 80 dB.

The paper presents two signal processing algorithms for continuous measurement of gas concentration using low cost metal oxide semiconductor sensors. A major limitation of these sensors in quantitative analysis of gases is their non-linearity. A good solution of this problem is to combine these sensors with appropriate signal processing techniques. The first algorithm that we developed is based on artificial neural networks. As the second option, we constructed a model based on the characteristic formula of metal oxide semiconductor sensors. A detailed analysis of the developed algorithms and a comparison between them is presented in the paper.

This paper describes an application of boundary scan IEEE Std. 1149.1 at system level. It provides the description of the design and the implementation options of a VME boundary scan controller board prototype and the corresponding software. The prototype was designed to use the Module Test and Maintenance (MTM) bus, existing in the VME 64x backplane, to apply the IEEE 1149.1 test vectors to a single board with a specific test infrastructure also described in this contribution. The software takes the boundary scan test/programming vectors generated by an automatic test pattern generator (ATPG) in serial vector format (SVF), and converts them into a format suitable to be used in the considered test infrastructure.

The example of proficiency improvement process is presented here. The main idea of that process is support for a group of enterprises. Appropriate activities allow achieving a good practice in parameter determination. The first step is to consider general rules in order to avoid any disagreement during whole process passing. Here useful are recommendations given in “new approach” of quality systems, according to the normative documents ISO. Therefore the team has a possibility to prepare, verify and finally validate theirs final inspection procedures. Training sessions help to implement proper test methods. A correlation between different test stands and applied procedures could be also found out in this way. Previously the most important influences, which could occur there, should be given an attention. It allows achieving and maintaining appropriate quality conditions there. Moreover it provides the criteria for competence qualification. Subsequently the responsible management has a possibility to determine personnel proficiency. It is a reason for joining both proficiency improving and credibility assuring processes regarding to different test stands. R&D unit, as the independent body, could acknowledge results obtained there.

A method is presented for on-line estimation of internal quantities to be used in the torque control of induction machines without speed sensor. In this paper simplified observers for rotor and stator flux linkages and for the electromechanically converted torque are discussed. These observers are obtained from induction machine dynamic equations and by using currents and voltages as input variables. Numerical results with such observers for rotor and stator flux linkages are shown, for evaluation of capacities and limitations. The quality of such observers, integrated in torque and flux control schemes, is verified by experimental results obtained by digital signal processing with a fast controller on the induction motor drive system.