METHOD FOR ENHANCING DEMON PROCESSING PERFORMANCE USING MULTIBAND PROCESSING

摘要

PURPOSE: A demon process performance improvement method is provided to indicate a necessary performance with a small calculation amount. CONSTITUTION: A band pass filter block generates a divided band signal by inputting a propeller noise signal (S400, S410). A square calculation block executes square calculation for the generated divided band signal (S420). A low pass filter block removes a high frequency signal from the divided band signal and a direct current (DC) signal from the divided band signal in which the high frequency signal is removed (S430). A fast Fourier transform (FFT) block executes FFT for the divided band signal in which the DC signal is removed (S440). A noise regulation block generates a spectrum by regulating noise in order to remove background noise in the divided band signal (S450). An averaging unit generates an average spectrum by averaging the generated spectrum (S460). [Reference numerals] (AA) Start; (BB) End; (S400) Input a noise signal; (S410) Generate a split band signal using multiple band pass filters; (S420) Perform a square process in a selected split frequency band; (S430) Removal a high frequency signal and a DC signal; (S440) Convert a time area signal into a frequency area; (S450) Generate a spectrum by regulating noise in order to remove background noise; (S460) Generate an average spectrum by averaging the generated spectrum