Now showing items 1-20 of 23

  • ACE Strategy with Virtual Channels 

    Vondrasek, M.; Sovka, Pavel; Tichy, T. (Společnost pro radioelektronické inženýrství, 2008-12)
    Cochlear implant is an electronic device, which can mediate hearing sensations to profoundly deaf people. Contemporary cochlear implants are sophisticated electronic devices; however, their performance could still be ...
  • Analysis and Optimization of Telephone Speech Command Recognition System Performance in Noisy Environment 

    Novotny, J.; Sovka, Pavel; Uhlir, J. (Společnost pro radioelektronické inženýrství, 2004-04)
    This paper deals with the analysis and optimization of a speech command recognition system (SCRS) trained on Czech telephone database Speechdat(E) for use in a selected noisy environment. The SCRS is based on hidden Markov ...
  • Analysis and Simulation of Frost's Beamformer 

    Strupl, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2003-06)
    Sensor arrays are often used for a signal separation from noises using the information about the direction of arrival. The aim of this paper is to analyze Frost's beamformer with respect to the speech preprocessing for the ...
  • Analýza ST-T segmentů v signálech EKG se zaměřením na alternace vlny T 

    Tannenberg, Milan
    Kardiovaskulární onemocnění způsobují vysoké procento úmrtí po celém světě. V řadě vyspělých zemích je toto procento úmrtí dokonce vyšší než úmrtí způsobená onemocněním rakovinou. V současné době je používáno mnoho metod ...
  • CAR2 - Czech Database of Car Speech 

    Pollak, P.; Vopicka, J.; Hanzl, V.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 1999-12)
    This paper presents new Czech language two-channel (stereo) speech database recorded in car environment. The created database was designed for experiments with speech enhancement for communication purposes and for the study ...
  • Cross-Language Experiment 

    Šťastný, Jakub; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2003-09)
    The contribution addresses the cross-language experiment. The aim was to test the possibility of the conversion French phoneme models into Czech ones. This model conversion uses the Hidden Markov Models (HMM) classification ...
  • Derivation of Criterion Suitable for Evaluation of Multichannel Noise Reduction Systems for Speech Processing 

    Bolom, V.; Ingerle, J.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2009-12)
    This paper deals with the theoretical derivation of the Noise Reduction criterion suitable for evaluation of multichannel noise reduction system performance. This criterion is suitable for noise suppression assessment and ...
  • Detection of Cortical Oscillations Induced by SCS Using Power Spectral Density 

    Svoboda, L.; Stancak, A.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2007-12)
    Chronic, intractable pain of lower back and lower extremity might develop as the result of unsuccessful surgery of back. This state called failed-back surgery syndrome (FBSS) cannot be effectively treated by pharmacotherapy. ...
  • Echo Cancellation I: Algorithms Simulation 

    Brodsky, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2000-04)
    Echo cancellation system used in mobile communications is analyzed. Convergence behavior and misadjustment of several LMS algorithms are compared. The misadjustment means errors in filter weight estimation. The resulting ...
  • Echo Cancellation II: Double Talk Detection and Environmental Noise Influence 

    Brodsky, M.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2000-04)
    Two problems arising in the real-life application of echo cancellation systems are analysed.The first, simultaneous activity of both telephone users (double talk) deteriorates the echo suppression. The second, environmental ...
  • EEG Signal Classification: Introduction to the Problem 

    Šťastný, Jakub; Sovka, Pavel; Stancak, A. (Společnost pro radioelektronické inženýrství, 2003-09)
    The contribution describes the design, optimization and verification of the off-line single-trial movement classification system. Four types of movements are used for the classification: the right index finger extension ...
  • Exploiting Temporal Context in High-Resolution Movement-Related EEG Classification 

    Doležal, Jaromír; Šťastný, Jakub; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2011-09)
    The contribution presents an application of a movement-related EEG temporal development classification which improves the classification score of voluntary movements controlled by closely localized regions of the brain. A ...
  • A Family of Coherence-Based Multi-Microphone Speech Enhancement Systems 

    Pham, Q. H.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2003-06)
    This contribution addresses the problem of additive noise reduction in speech picked up by a microphone in a noisy environment. Two systems belonging to the family of coherence-based noise cancellers are presented. Suggested ...
  • ICA Model Order Estimation Using Clustering Method 

    Ruckay, L.; Šťastný, Jakub; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2007-12)
    In this paper a novel approach for independent component analysis (ICA) model order estimation of movement electroencephalogram (EEG) signals is described. The application is targeted to the brain-computer interface (BCI) ...
  • Implementation of a Two-Channel Maximally Decimated Filter Bank using Switched Capacitor Circuits 

    Nahlik, J.; Hospodka, J.; Sovka, Pavel; Psenicka, B. (Společnost pro radioelektronické inženýrství, 2013-04)
    The aim of this paper is to describe the implementation of a two-channel filter bank (FB) using the switched capacitor (SC) technique considering real properties of operational amplifiers (OpAmps). The design procedure is ...
  • Invariance of the Null Distribution of the Multiple Coherence 

    Bortel, R.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2014-12)
    In this paper we investigate the invariance of the null distribution of the multiple coherence (MC) to the statistics of the examined signals. We show that when the MC is computed between a group of signals x_i[n], i=1,...,K ...
  • Localization of Cortical Oscillations Induced by SCS Using Coherence 

    Svoboda, L.; Stancak, A.; Sovka, Pavel (Společnost pro radioelektronické inženýrství, 2007-12)
    This paper suggests a method based on coherence analysis and scalp mapping of coherence suitable for more accurate localization of cortical oscillations induced by electric stimulation of the dorsal spinal cord (SCS), which ...
  • Metody detekce a klasifikace v analýze EKG signálů 

    Kičmerová, Dina
    První část práce je zaměřena na měření QT intervalu. QT interval může být použit k hodnocení kardiovaskulárního zdraví pacientů a detekovat potenciální abnormality. QT interval je měřen od začátku QRS komplexu až po konec ...
  • Nové přístupy pro optická měření elektrické aktivity myokardu 

    Švrček, Martin
    Tato disertační práce se zabývá novými přístupy pro optické mapování elektrické aktivity na povrchu myokardu. V práci je popsán princip optického mapování, stejně jako současný stav dané problematiky ve světě. Součástí je ...
  • Overcoming Inter-Subject Variability in BCI Using EEG-Based Identification 

    Šťastný, Jakub; Sovka, Pavel; Kostilek, M. (Společnost pro radioelektronické inženýrství, 2014-04)
    The high dependency of the Brain Computer Interface (BCI) system performance on the BCI user is a well-known issue of many BCI devices. This contribution presents a new way to overcome this problem using a synergy between ...