Digital Filter Application for Squelch on Industrial Frequency Noise and its Harmonic Waves Interference

Abstract:

Industrial frequency and its harmonious waves are one of the main interferences in electronic measurement, which will cause severe influence on test accuracy. Digital filter is better than analog filter at resolution; furthermore multi-band stop digital filter design is unrealizable for analog filter design method. This paper designs an FIR(Finite Impulse Response) multi-band stop digital filter to reject the noise of 50 Hz and its harmonic waves from power network, whose stop bands are respectively as 48~52 Hz, 98~102 Hz and 148~152 Hz. Simulation results prove that the noise can be depressed to 30 dB. To analyze the filtered signal can improve accuracy of the test system. The whole course includes two parts, which are filter mathematical modeling and filter algorithm implementation on worksite data.

• Periodical: Applied Mechanics and Materials (Volumes 668-669)
• Pages: 1059-1063
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.668-669.1059
• Online since: October 2014
• Authors: Wei Jun Wen*
• Keywords: Filter Resolution, FIR Band Stop Digital Filter, Industrial Frequency Noise Squelches, Mathematical Modeling

References

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[4] Information on http: / www. wave. auak. com.