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Interactive Time-Varying Digital Filter in LabVIEW

Module by: Ed Doering. E-mail the authorEdited By: Erik Luther, Sam Shearman

Summary: A time-varying digital filter can easily be implemented in LabVIEW, and this module demonstrates the complete process necessary to develop a digital filter that operates in real-time and responds to parameter changes from the front panel controls. An audio demonstration of the finished result includes discussion of practical issues such as eliminating click noise in the output signal.

Table 1
LabVIEWq.png This module refers to LabVIEW, a software development environment that features a graphical programming language. Please see the LabVIEW QuickStart Guide module for tutorials and documentation that will help you:
• Apply LabVIEW to Audio Signal Processing
• Get started with LabVIEW
• Obtain a fully-functional evaluation edition of LabVIEW

A time-varying digital filter can easily be implemented in LabVIEW. The screencast video of Figure 1 walks through the complete process to develop a digital filter that operates in real-time and responds to parameter changes from the front panel controls. The video includes an audio demonstration of the finished result and discusses practical issues such as eliminating clicks in the output signal.

LabVIEW.png Download the source code for the finished VI: filter_rt.vi. Refer to TripleDisplay to install the front-panel indicator used to view the signal spectrum.

Figure 1: [video] Building an interactive real-time digital filter in LabVIEW
Figure 1 (sub_rt-filter-build.html)

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A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

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