# LabVIEW

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## Regarding changing the position of filter in overlap add

Hello, I have overlap add filter. I am asked to change the position of the filter with the output . Move filter either side, its like tuning the output using the filter. I have no idea on how to start this initially. Please help me in this.

Message 1 of 8
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## Re: Regarding changing the position of filter in overlap add

Srinkoo,

Overlap-Add method in filtering is more of a mathematical concept than a LabVIEW how-to. To cover all of our bases, here is a quick reference on Overlap-add here.

It also looks like we have an example of how to do this on our community here.

Logan H

National Instruments
Applications Engineer
Message 2 of 8
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## Re: Regarding changing the position of filter in overlap add

Sir,

First of all, I thank you for the reply

Lets say, I have a filter. 1's represent the portion of filter and 0's represent LOW of filter. Now, I want to move the filter as shown with arrows in diagram. I know the concept. Its by shifting 1's and 0's either side to move the filter. But, I am confused about how to do it.

Message 3 of 8
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## Re: Regarding changing the position of filter in overlap add

Srinkoo,

Double check the file you posted, I don't see much in the way LabVIEW code or filter diagrams.

Logan H

National Instruments
Applications Engineer
Message 4 of 8
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## Re: Regarding changing the position of filter in overlap add

Hello Sir,

I have a filter. 1's represent the portion of filter and 0's represent LOW of filter. Now, I want to move the filter as shown with arrows in diagram. I know the concept. Its by shifting 1's and 0's either side to move the filter. But, I am confused about how to do it.

Message 5 of 8
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## Re: Regarding changing the position of filter in overlap add

Shrinkoo,

From your diagram, it basically you want to perform a Bandpass filter on a signal. Have you looked through the Signal Processing palettes to see if a Bandpass Filter VI exists? By searching www.ni.com I was able to find this set of example code that allows you to change the filter settings on the fly through the Digital IIR Filter VI.

Logan H

National Instruments
Applications Engineer
Message 6 of 8
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## Re: Regarding changing the position of filter in overlap add

Sir,

When i wanted to change the width of signal, I am not able to do it. Waht specifications do we need to change to increase or decrease the width. And, How do I perform this bandpass filter VI on a signal.

Message 7 of 8
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## Re: Regarding changing the position of filter in overlap add

The points at which the frequencies are attenuated are called the cutoff frequencies. In the case of a bandpass filter, there is an upper and a lower cutoff frequency. In this VI, they are defined by the Upper Fc and Lower Fc controls. Examine the block diagram of the example VI listed a few posts above. Check it out in highlight execution mode to see how the data is passed. Give it a shot yourself with playing with the controls to see how things change.

Logan H

National Instruments
Applications Engineer
Message 8 of 8
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