Wyniki wyszukiwania - BazTech

1

FIR Filter Design Using Distributed Maximal Flatness Method

Blok M.

International Journal of Electronics and Telecommunications

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2013

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Vol. 59, No. 1

59-66

EN

In the paper a novel method for filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the method used to design the most common FIR fractional delay filter - the maximally flat filter. The MF filter demonstrates excellent performance but only in a relatively narrow frequency range around zero frequency but its magnitude response is no greater than one. This "passiveness" is the reason why despite of its narrow band of accurate approximation, the maximally flat filter is widely used in applications in which the adjustable delay is required in feedback loop. In the proposed method the maximal flatness conditions forced in standard approach at zero frequency are spread over the desired band of interest. In the result FIR filters are designed with width of the approximation band adjusted according to needs of the designer. Moreover a weighting function can be applied to the error function allowing for designs differing in error characteristics. Apart from the design of fractional delay filters the method is presented on the example of differentiator, raised cosine and square root raised cosine FIR filters. Additionally, the proposed method can be readily adapted for variable fractional delay filter design regardless of the filter type.

2

Analiza efektywności i kosztów sprzętowej realizacji filtrów cyfrowych o zadanej liniowej charakterystyce fazowej

Milik A., Pułka A., Konopacki J.

Elektronika : konstrukcje, technologie, zastosowania

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2010

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Vol. 51, nr 9

40-44

PL

Artykuł porusza kluczowe zagadnienia związane z projektowaniem filtrów cyfrowych o pożądanej liniowej charakterystyce fazowej. Autorzy zaproponowali własną metodologię implementacji filtrów typu SOI oraz NOI. Następnie uzyskane rezultaty (struktury filtrów) zostały przeanalizowane teoretycznie pod kątem ich złożoności obliczeniowej. Wyniki tej analizy zostały zweryfikowane poprzez syntezę sprzętową struktur SOI oraz NOI w programowalnych układach logicznych typu FPGA. Dokonana została optymalizacja pod kątem jak najefektywniejszego wykorzystania dostępnych zasobów. Do realizacji użyto nowoczesne środowisko do modelowania i symulacji układów Active-HDL, które umożliwia współpracę z programem MATLAB.

EN

The paper deals with digital filters design with required linear phase characteristic. The authors proposed a new methodology of digital IIR and FIR filters implementation. The obtained results (filter structures) have been analyzed towards their computation complexity. Results of this analysis have been verified by the logic synthesis of IIR and FIR in FPGA. Then the structures have been optimized for best circuits resources utilization. The modern modeling and cosimulation environment Alcdec's Active-HDL with MATLAB has been used to complete the entire task.

3

Frequency and time constrained digital filter design

Henzel N.

Journal of Medical Informatics & Technologies

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2006

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Vol. 10

103--112

EN

This paper describes a new method for linear phase finite impulse response (FIR) filters design. This new approach, based on the ε-insensitive loss function, allows the design process to take into account not only constraints specified in the frequency domain, but also constraints on the output, time domain, signal. The performances of the proposed approach are shortly illustrated by a high-pass filter for ECG baseline wander reduction.