Institute of Electronics and Computer Science

Riga, Latvia

Institute of Electronics and Computer Science

Riga, Latvia

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Nesenbergs K.,Institute of Electronics and Computer Science
IEEE Instrumentation and Measurement Magazine | Year: 2016

The field of wearable computing has great implications in the measurement of the human body and its surrounding environment, with potentially high impact in medical applications such as early detection, treatment, compliance monitoring, care for the frail and elderly, telemedicine, physical therapy, etc. [1]. Unfortunately, the field of wearable computing is still held back by the lack of a standardized framework and development process, forcing developers into custom and time intensive solutions. In this paper, the current progress of development of a universal smart textile system is discussed which would solve this problem and accelerate the field of smart wearable electronics, providing a universal platform for attaching several hundreds of sensors to clothing in convenient, unobtrusive and energy efficient ways. The main problems and potential solutions discussed in this article include power and data transfer wire topology, allowing the textile to be arbitrarily cut and sewn into smart clothing, data transmission architecture, providing high bandwidth and low energy data transfer, and support for miniaturization and elasticity, making the potential end product as unobtrusive as possible. © 2016 IEEE.


Homjakovs I.,Institute of Electronics and Computer Science
Proceedings of the Biennial Baltic Electronics Conference, BEC | Year: 2015

This paper presents an adaptive sampling approach in which analog signal samples are taken depending on its activity. By using the proposed approach the number of A/D conversions and therefore the resulting number of samples can be reduced during inactive periods of an analog signal. The proposed method is beneficial for ultra-low power circuits, e.g. sensors networks, where the nodes are idle most of the time, yet, in conventional sampling approach, the samples would be taken even if analog input signal is constant. Since all samples have to be transmitted at some point, this causes unnecessary energy consumption even if analog signal contains no useful information. Proposed sampling scheme allows achieving high data compression rate and reduction of energy consumption. Proposed implementation of signal activity-dependent sampling and power consumption analysis are presented in this paper. In addition, the circuit that tracks the variation of analog input signal is presented. © 2014 IEEE.


Aristov V.,Institute of Electronics and Computer Science
Automatic Control and Computer Sciences | Year: 2016

The possibility of achieving the maximum level of the probe pulse spectrum at a fixed frequency when selecting the optimal duration of the excitation pulse of the radar with pulse excitation antenna has been investigated. © 2016, Allerton Press, Inc.


Grunde U.,Institute of Electronics and Computer Science
Elektronika ir Elektrotechnika | Year: 2012

The modification of the level crossing sampling algorithm is proposed in order to decrease the volume of sampled data. The reconstruction of the signal based on sampled data is discussed. The performance of the signal reconstruction based on different interpolation splines is evaluated. The evaluation of the signal recovery is based on metrics including the cross correlation coefficient, the root mean square error and the percentage root mean square difference. It is demonstrated that compression coefficient's value 10 is achievable for the cross correlation coefficient 0.92. Ill. 7, bibl. 5 (in English; abstracts in English and Lithuanian).


Ozols K.,Institute of Electronics and Computer Science
Proceedings of 25th International Conference Radioelektronika, RADIOELEKTRONIKA 2015 | Year: 2015

This paper describes an implementation of reception and real-time decoding of Asynchronous Sigma-Delta modulator (ASDM) encoded and wirelessly (On-off keying) transmitted signals. By using Fast reconstruction algorithm it is possible to reconstruct the original signal ≈ 25 times faster than by Classical reconstruction algorithm, if the signal lenght is 1 second, and ≈ 61, ≈ 130 and ≈ 228 times faster, if the length of the signal is 2, 4 and 8 seconds, respectively. Developed overall system consists of 3 parts - superheterodyne receiver, digitizer, PC with adaptive data reconstruction algorithm. Real-time decoding algorithm, which consist of data acquistion, filtering, processing, reconstruction and vizualization is implemented in LabView as a virtual instrument with graphical user interface (GUI). © 2015 IEEE.


Rybakov A.S.,Institute of Electronics and Computer Science
Automatic Control and Computer Sciences | Year: 2014

Informative parameters of angle-modulated signals evaluated by the zero-crossing time instants are studied. Specific features of the compressed sensing technique used to restore modulating signals are considered. It is shown that the standard compressed signal processing techniques based on the minimization do not enable the solution of the problem of the off-the-grid recovery of spectral components. It is proposed to use an iterative method for signal recovery based on successive localization of the spectral peaks between the grid nodes. © 2014 Allerton Press, Inc.


Patent
Institute Of Electronics And Computer Science | Date: 2016-11-16

This invention relates to electrical circuits and more particularly to the input clocked comparator circuit (1) of an equivalent time sampling converter for high-speed repetitive signals. Said circuit (1) comprises typical elements of previously known input clocked comparators, and an emitter resistor (13) with its one terminal connected to the emitters (1E and 2E) of the first and second transistors and to an input (7) of the strobe pulse signal (Uclk), and the other terminal connected to a common bus (8), to which the first terminals of the collector resistors (10 and 11) are also connected. Said invention provides an exact match between the input impedance of the clocked comparator and the characteristic impedance of the line through which the high-speed input signal is applied to the device.


Kadikis R.,Institute of Electronics and Computer Science
Proceedings of 25th International Conference Radioelektronika, RADIOELEKTRONIKA 2015 | Year: 2015

A feature-based image registration method is presented for the use on the multispectral skin images. The proposed method allows the use and combination of different kinds of feature points, so it can be adjusted to different applications. The local minima and maxima are used as features for the skin images. By analyzing all possible shifts among feature points in the reference and sensed images, the proposed method efficiently finds translation among these images. The method is expanded to also determine rotation and scale. The proposed method is compared with other area-based and feature-based methods (proposed in the literature specifically for skin images) by testing those methods on a set of multispectral skin images. © 2015 IEEE.


Lorencs A.,Institute of Electronics and Computer Science
Acta Informatica | Year: 2012

Finitely generated bi-ideals with letters from a selected alphabet A are considered. We solve the equivalence problem for generating systems of bi-ideals, i.e., look for an effective procedure which provides the means of determining if two generating systems 〈u0,..., um-1〉 and 〈v0,..., vn-1〉 represent equal or different bi-ideals. We offer a method of constructing, for every generating system 〈u0,..., um-1〉 an equivalent generating system 〈u′0,..., u′m-1〉 with differing members. We also describe an algorithm for deciding if two generating systems 〈u0, u1〉 and 〈v0, v1〉 are equivalent or not. For a general case, the problem of existence of such an algorithm remains open. © 2012 Springer-Verlag.


Baums A.,Institute of Electronics and Computer Science
Automatic Control and Computer Sciences | Year: 2012

For the appraisal and comparison of mobile autonomous robots as systems of real time, a principle of time the characteristics determination is suggested on the basis of the characteristics of the action phases of the robot. If for all the phases hard constraints based on the robot's structure have been established, a too rigid indicator of the real time is established. A generalized estimate with account for the soft and hard estimates is attained by the time/utility function. The studies were performed using a dummy model of an autonomous robot called a physical model. © Allerton Press, Inc., 2012.

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