Filtering with Butterworth

Hello world

I tried to use Butterworth as a low pass filter to limit the frequanies of my signal. I have provided the attached code, in which two simple sine waves with frequencies of 2 Hz and 10 Hz have been added. I used the of Butterworth low-pass filter with 4 Hz as low-pass frequency. I expect to have the sinusoidal signal with frequency = 2 Hz (2<><10) but="" the="" output="" of="" the="" filter="" (and="" also="" its="" fft)="" is="" a="" very="" ugly!!="" and="" weird="" signal.="" would="" anyone="" please="" help="" me="" to="" figure="" out="" where="" my="" mistake="" is="" and="" how="" to="" solve="" this="">

Thank you

Soran

Soran,

The default values on your controls do not match settings simulate Signal DV, specifically the sampling rate. When I put the control of sampling rate of 250, everything seems fine.

Creating a waveform to tell the second AS FFT Power Spectrum VI on timing information will properly give scaling of graphics for the filtered signals. Note that the axes of the spectrum are value logarithmic mapping in the image below.

Lynn

Tags: NI Software

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