CASPIAN JOURNAL
MANAGEMENT AND HIGH TECHNOLOGIES
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Read | Ivanov Victor V., Shakurskiy Victor K., Shakurskiy Maxim V. // Caspian journal : management and high technologies. — 2012. — №1. — pp. 35-41. |
Ivanov Victor V. - Doctor of technical science, Volga Region State University of service, 445677, Russia, Gagarina 4, Togliatti, Ivanov@tolgas.ru.
Shakurskiy Victor K. - Doctor of technical science, Toliatti State University, 445677, Russia, Belorusskaya 14, Togliatti, Shakurskiy@mail.ru.
Shakurskiy Maxim V. - Head of laboratory, Volga Region State University of service, 445677, Russia, Gagarina 4, Togliatti, M.Shakurskiy@gmail.com.
In article solves the problem of the synthesis of digital filters with given parameters of amplitude-frequency characteristic using frequency-sampling method. The classical approach to the synthesis of digital filters leads to a discrete change in bandwidth in increments equal to the bandwidth of a single elementary digital filter. In this case optimization of amplitude-frequency characteristic is performed by symmetric amplitude coefficients for the output signals of the elementary digital filters. The article shows the effect of a smooth shift of bandwidth by asymmetric variation of the amplitude coefficients of elementary digital filters. This effect allows the synthesis of a digital filter with a determined bandwidth, and the suppression outside the passband with high accuracy. The technology of synthesis based on the use of asymmetric, relative to the average elemental digital filter, values of the amplitude coefficients for the output of primary and additional elementary digital filters. This preserves the linearity of the phase-frequency characteristics. In article shown an example of the synthesis of digital filter on the given parameters of amplitude-frequency characteristics with use of asymmetric coefficients for the output of the elementary digital filters. The result of improved performance of amplitude-frequency characteristic achieved by the method of successive approximations.
Key words: frequency-sampling method,amplitude-frequency characteristic,Kotelnikov series,elementary digital filter