Multistage digital prefiltering of noisy tachometer signals

Author

Ovaska, Seppo J.

Author_Institution

Kone Corp., Hyvinkaa, Finland

Volume

37

Issue

3

fYear

1988

fDate

9/1/1988 12:00:00 AM

Firstpage

466

Lastpage

468

Abstract

A multistage digital prefiltering concept is discussed. The prefilter is implemented by using multirate signal-processing techniques, and contains both linear and nonlinear subfilters. The impulsive and wideband noise components are attenuated by a cascade of a standard median filter (SMF) and a low-order Hanning window (HW). A multirate digital filter is used to attenuate the 50/60-Hz power line frequency and its harmonics. The multirate principle with oversampling and decimation is used to reduce the complexity of the required analog antialiasing filter. The multistage filter was tested in a simulation environment and the results were satisfactory

Keywords

digital filters; signal processing equipment; tachometers; 50 Hz; 60 Hz; analog antialiasing filter; harmonics; linear subfilters; low-order Hanning window; multirate digital filter; multirate signal-processing; multistage digital prefiltering; noisy tachometer signals; nonlinear subfilters; signal processing equipment; simulation; standard median filter; wideband noise; Distortion measurement; Electrons; Microprocessors; Nonlinear filters; Power harmonic filters; Power system harmonics; Rotation measurement; Semiconductor device noise; Velocity measurement; Wideband;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.7478

Filename

7478