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Online Filtering

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Signal Processing Resource Center » LabVIEW Signal Processing Shipping Examples » Online Filtering

This example uses the IIR Cascade Filter VI to perform online filtering without having to compensate for the initial transient after the first block of data is filtered. This example repeatedly generates a noisy sine wave and filters it using two different methods. The first method uses the memory mechanism of the IIR Cascade Filter VI to retain state information about previous inputs and outputs of the filter in order to eliminate the transient. The second method uses no memory mechanism causing the IIR Cascade Filter VI to assume zero initial conditions each time the VI is called. The result is that on each iteration this method produces a transient rather than the filtered signal.

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This example requires the Full or Professional version of LabVIEW and is included as a shipping example. Download the LabVIEW Evaluation to try this example on your computer, or visit the LabVIEW Online Evaluation to use LabVIEW without downloading any software. To run this example, open LabVIEW and navigate to Help » Find Examples... » Analyzing and Processing Signals » Signal Processing

 


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This example program (this "program") was developed by a National Instruments ("NI") Applications Engineer. Although technical support of this program may be made available by National Instruments, this program may not be completely tested and verified, and NI does not guarantee its quality in any way or that NI will continue to support this program with each new revision of related products and drivers. THIS EXAMPLE PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND AND SUBJECT TO CERTAIN RESTRICTIONS AS MORE SPECIFICALLY SET FORTH IN NI.COM'S TERMS OF USE (http://ni.com/legal/termsofuse/unitedstates/us/).