filtering of noise over 200 kHz

Hello!

I'm recording ultrasonic vocalizations of rat at 1 ms/s using an acquisition of data PCI-6132.  One of my colleagues is ultrasound analysis of data from the records and asked me to apply a filter on the signal, as it is registered.  He asked the specifications was to "filter noise on 200kHs, with a steep slope.  I have no training in hearing analysis, so I have no idea what he's talking about, or how to impliment it.  Can anyone interpret this and help me understand this?  Thank you!

Matt

When I had to filter signals in LabVIEW, I had success with the express VI, called "filter". You can find it in the following range: "treatment-> conditioning of waveform of the Signal-> Filter.VI.

Before we begin, I noticed that your condition is to filter "noise more of 200 kHz. This means filter any more than 200 kHz or just 'noise '?

If you filter any more than 200 kHz, there are several parameters that you need to pay to reach your goal. Double-click the Filter.VI once you have he fell on the block diagram. The first thing you need to set is the same type. If you want to filter all above 200 kHz and spend everything below 200 kHz, you want a low-pass filter.

Since this is a low-pass filter, you will have only a cut-off frequency. It's 200 kHz is your case, since you want to spend everything below 200 kHz.

For a slope steep, I like to use the elliptical topology. You can start with an order of 3 to see if it produces the answer you need.

I would recommend search filters on a site like Wikipedia, if this does not produce the results you need. Using this VI will take you where you need to go, but you may need to adjust the settings based on your signal. However, I think this will at least get you started in the right direction!

Tags: NI Software

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