I have a question regarding decimation function (decimation(continuous).vi) in labview. Does it have a low pass filter to take care of aliasing, if yes is it a zero phase filter. Basically I am looking for some thing which can decimate 20KHz sampled signals to 5KHz.
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The resample VI in the same palette has an anti-aliasing LP filter option. I'm not sure if it's zero-phase.
Does labview have any vi that has inbuilt low pass filter along with decimation?
Depends on your LabVIEW version and installed toolkits.
The Digital Filter Design Toolkit has a decimation VI that includes a LP AA filter. Open the LabVIEW Help and search for 'decimation' and 'filter' to see what tools are available.