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An analysis of the characteristics of a recursive digital filter with antisymmetric coefficients

Keywords:

A.I. Tyazhev – Dr. Sc. (Eng.), Professor, Department of Radio Broadcasting and Television, Volga State University of Telecommunications and Informatics (Samara) E-mail: tyagev@psati.ru


The article analyzes the characteristics of the digital band-pass recursive folder with antisymmetric coefficients. Such a medium fre-quency band filter about equal blowing-quarter of the sampling frequency, and uneven frequency response (amplitude) and phase-frequency characteristics inclination (PFC) in the passband depends on the filter coefficients. The article concluded that the formula for calculating the frequency and phase response of the filter, as well as to derive relationships describing the connection bandwidth, frequency response, and tilt the FF in the pass band of the filter coefficients. It is shown that the recursive digital bandpass filter with antisymmetric coefficients is impossible to make the frequency response in the passband is flat and phase response in the passband would have a slope of zero at the same time.
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