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Time filter

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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. Source


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). Source


Rybakov A.S.,Institute of Electronics and Computer Science
Automatic Control and Computer Sciences | Year: 2011

The method of the interpolation measurement of the time instants of an event occurrence based on the estimation of the gravity center of a bell-shaped signal by spectral coefficients is presented. It is shown that the use of linear algorithms for estimating the spectral coefficients of a regression model allows for the picosecond accuracy of the measurements of the time intervals. The accuracy of the method is illustrated by computer simulation results. © Allerton Press, Inc., 2011. Source


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. Source


Rybakov A.S.,Institute of Electronics and Computer Science
Automatic Control and Computer Sciences | Year: 2010

The peculiarities of the interpolation method based on digital signal processing are considered. It is shown that the transfer function of the interpolator may be represented by the composition of two functional components. A nonstatistical method of reconstruction of the form of the corrective component of the transfer function based on processing of the scatter diagram of the ordered pairs of the experimental and predicted data is investigated. It is shown that such pairs may be obtained in the process of periodic event flow timing with estimations of the time positions of the signal and the predetermined instants of the event occurrence being elements of the ordered pairs. The efficiency of the reconstruction method is illustrated by the experimental results. © 2010 Allerton Press, Inc. Source

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