Digital Filter Design Toolkit

June 2008, 371988B-01

The LabVIEW Digital Filter Design Toolkit includes several filter design tools for designing, analyzing, and simulating floating-point and fixed-point digital filters, including multirate filters. This help file discusses the general digital filter design process and introduces the tools in the Digital Filter Design Toolkit that you can use in a digital filter design.

Note  All occurrences of filters in this book refer to single-rate filters unless these topics explicitly use multirate filters.

You can use the Signal Processing VIs in the LabVIEW Full or Professional Development System to perform waveform measurements, waveform conditioning, waveform monitoring, waveform generation, signal processing, and point-by-point analysis. The Signal Processing VIs contain some digital filter design VIs similar to VIs in the Digital Filter Design Toolkit. For example, the Butterworth Coefficients VI is similar to the DFD Butterworth Design VI and the Parks-McClellan VI is similar to the DFD Remez Design VI. However, the Digital Filter Design VIs provide more capabilities, such as support for arbitrary phase and magnitude specifications and fixed-point filter design.

Although the VIs have similar functionality, the results you obtain might be different because the design algorithms are different. Refer to the National Instruments Web site at ni.com for information about working with the Signal Processing VIs and the Digital Filter Design VIs.

This help file contains:

• Concepts—An overview of how to use the Digital Filter Design Toolkit.
• How-To—Step-by-step instructions on accomplishing tasks using the Digital Filter Design Toolkit.
• Reference—Detailed information about the Digital Filter Design VIs.
• MathScript Functions—Detailed information about the Digital Filter Design MathScript classes of functions and commands that LabVIEW MathScript supports.

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