Pre-correction of phase-frequency characteristics of digital filters

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Abstract

The article is devoted to the synthesis of a digital filter computer model with zero phase-frequency characteristic. A predetermined structural implementation of the digital filter with zero phase-frequency response is based on double filtering of the signal in the forward and reverse directions, as well as on filters with a finite impulse response. This article discusses the implementation of a filter with zero phase-frequency response based on filters with infinite impulse response. The implementation of pre-correction of the phase-frequency response of the filter is achieved due to the use of the two-channel structural diagram with the input signal spectrum transfer. The complexity of using filters with an infinite impulse response is associated with its nonlinearity, which requires pre-correction in order to linearize the phase-frequency response. The article discusses both a mathematical model of signal passage through a block diagram and a computer model in the Matlab-Simulink environment in static and dynamic modes.

About the authors

M. V. Shakurskiy

Povolzhskiy State University of Telecommunications and Informatics

Author for correspondence.
Email: m.shakurskiy@psuti.ru

Head of Information Security Department, Doctor of Technical Sciences

Russian Federation, Samara

References

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  8. Digital Filter with Zero-Phase Characteristic: patent 109619. Russian Federation. No. 2011123825 / V.K. Shakurskiy (RU), M.V. Shakurskiy (RU); zayavl. 10.06.2011; opubl. 20.10.2011, byul. no. 29. (In Russ.)
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