the power of the spectrum graph and butterworth filter
Hello
I am beginner in labview, I want to see the power spectrum of the sound samples, I want to see if there is any reason in these samples.
I use spectral measure, and then I filtered with butterworth filter samples. For output I using waveform graphs.
Before filtering the signal, I'm in the x axis of the graph between 0-22500 and the data mostly in 0-2500.
I've tried to filter using these values (fs = 1000 Hz, 0.125 hz = fl and fh = 500 hz) and the graphics almost the same thing but the axis of the graph is between 0-0, 5.
issues related to the:
What is the x axis properties? Why is different, but the graphics are the same?
Make the mistake with the program?
Hi Limavolt,
You have a problem with the bandpass filter VI, this VI generates only the signal of value i.e. table DBL. The signal is a cluster.
solution 1: you need to calculate 'dt' using the sampling frequency and use VI waveform construction to generate a signal's own scaling.
Normally, dt = sampling frequency/No. samples
Solution 2: replace the VI butterworth filter with filter VI express, this will produce signal without scaling.
Tags: NI Software
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