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    Wyświetlanie 1-4 z 4
    Tytuł:
    Digital finite impulse response notch filter with non-zero initial conditions, based on an infinite impulse response prototype filter
    Autorzy:
    Kocoń, S.
    Piskorowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221133.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    measurement
    signal processing
    finite impulse response (FIR) filter
    non-zero initial conditions
    transient response
    electrocardiography
    Opis:
    In this paper a concept of finite impulse response (FIR) narrow band-stop (notch) filter with non-zero initial conditions, based on infinite impulse response (IIR) prototype filter, is proposed. The filter described in this paper is used to suppress power line noise from ECG signals. In order to reduce the transient response of the proposed FIR notch filter, optimal initial conditions for the filter have been determined. The algorithm for finding the length of the initial conditions vector is presented. The proposed values of the length of initial conditions vector, for several ECG signals and interfering frequencies, are calculated. The proposed filters are tested using various ECG signals. Computer simulations demonstrate that the proposed FIR filters outperform traditional FIR filters with initial conditions set to zero.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 767-776
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorithm for simultaneous parameter estimation of a multi-harmonic signal
    Autorzy:
    Petrović, P. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/221172.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    band-limited signals
    fundamental frequency and Fourier coefficient estimation
    signal reconstruction
    finite-impulse-response (FIR) comb filter
    Opis:
    Estimating the fundamental frequency and harmonic parameters is basic for signal modelling in a power supply system. Differing from the existing parameter estimation algorithms either in power quality monitoring or in harmonic compensation, the proposed algorithm enables a simultaneous estimation of the fundamental frequency, the amplitudes and phases of harmonic waves. A pure sinusoid is obtained from an input multi-harmonic input signal by finite-impulse-response (FIR) comb filters. Proposed algorithm is based on the use of partial derivatives of the processed signal and the weighted estimation procedure to estimate the fundamental frequency, the amplitude and the phase of a multi-sinusoidal signal. The proposed algorithm can be applied in signal reconstruction, spectral estimation, system identification, as well as in other important signal processing problems. The simulation results verify the effectiveness of the proposed algorithm.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 693-702
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Square Root Raised Cosine Fractionally Delaying Nyquist Filter : Design and Performance Evaluation
    Autorzy:
    Hermanowicz, E.
    Rojewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226102.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SRRC
    Square Root Raised Cosine
    Nyquist filter
    special FIR
    Finite Impulse Response
    filter design
    ISI
    Intersymbol Interference
    fractional delay filter
    Opis:
    In this paper we propose a discrete-time FIR (Finite Impulse Response) filter which is meant to be applied as a square root Nyquist filter and fractional delay filter simultaneously. The filter enables to substitute for a cascade of square root raised cosine (SRRC) Nyquist filter and fractional delay filter in one device/algorithm. The aim is to compensate for transmission delay in digital communication system. Performance of the filter in the role of a matched filter is evaluated using a newly defined energetic ISI (Intersymbol Interference) measure and ability of the filter to completely eliminate the ISI involved by fractional delay of symbol shaping filter in transmitter or by channel delay. Considerations and results of the contribution are documented by suitable eye-diagrams and the SRRC filter responses.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 3; 247-252
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a novel FPGA-based system for filtering audio signals using a finite impulse response filters
    Autorzy:
    Lipowski, Adrian
    Majewski, Paweł
    Pluta, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2055238.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    audio filtering
    FIR filter
    FPGA
    signal processing
    Opis:
    In this article, an analysis of an innovative system for filtering signals in the audible range (16 Hz - 20 kHz) on programmable logic devices using a filters with a finite impulse response, is presented. Mentioned system was neat combination of software and hardware platform, where in the program layer a multiple programming languages including VHDL, JavaScript, Matlab or HTML were used to create completely useful application. To determine the coefficients of polynomial filters the Matlab Filter Design & Analysis Tool was used. Thanks to the developed graphic layer, a user-friendly interface was created, which allows easily transfer the required coefficients from the computer to the executive system. The practical implementation made on the FPGA platform, specifically on the Altera DE2- 115 development kit with the FPGA Cyclone IV, was compared with simulation realization of Matlab FIR filters. The performed research confirm the effectiveness of filtration in real time with up to 128th order of the filter for both audio channels simultaneously in FPGA-based system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 19--26
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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