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    Wyświetlanie 1-4 z 4
    Tytuł:
    Digital-Filter-Based Compensation of Case Effect in Sound-Level Meters
    Autorzy:
    Miękina, A.
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226786.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital compensation
    DSP applications
    FIR filter design
    Remez algorithm
    Opis:
    The methodology for the design of a digital filter, which should compensate the effect of reflections and diffraction from the sound-level meter's casing (the so-called case effect), is presented. The coefficients of the family of the finite impulse response (FIR) filters, which were selected to fulfill the requirements of the compensation, were obtained in the MATLAB environment using the Remez algorithm. The frequency response of the selected designed filter are given. The chosen FIR filter was implemented in an on-chip Enhanced Filter Coprocessor of a fixed point 24-bit digital signal processor of a sound-level meter.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 263-266
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of filter order for prescribed, reduced group delay FIR filter design
    Autorzy:
    Konopacki, J.
    Mościńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/199999.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital filters
    FIR filter design
    filter order estimation
    filtry cyfrowe
    projekt filtru FIR
    filtr FIR
    Opis:
    FIR filters are often applied, as they possess many advantages, including linear-phase response and well elaborated design methods. However, group delay introduced by FIR filters is usually large. The reduction of group delay can be obtained by restriction of the linear phase requirement only to the passband. One of the problems that appear while designing FIR filters with a prescribed value of group delay is the choice of the filter order. In the paper a formula for filter order calculation for the given filter parameters and dedicated for equiripple or quasi-equiripple approximation of the magnitude response has been derived based on experiments. Numerous examples that explain how to use the derived formula have been included.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 209--216
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Sparse FIR Filters with Low Group Delay
    Autorzy:
    Konopacki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1844604.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital filters
    FIR filter design
    sparse filters
    reduced group delay filters
    Opis:
    The aim of the work is to present the method for designing sparse FIR filters with very low group delay and approximately linear-phase in the passband. Significant reduction of the group delay, e.g. several times in relation to the linear phase filter, may cause the occurrence of undesirable overshoot in the magnitude frequency response. The method proposed in this work consists of two stages. In the first stage, FIR filter with low group delay is designed using minimax constrained optimization that provides overshoot elimination. In the second stage, the same process is applied iteratively to reach sparse solution. Design examples demonstrate the effectiveness of the proposed method.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 1; 121-126
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    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
      Wyświetlanie 1-4 z 4

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