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    This module is included inLens: Analog / Digital Communications with National Instruments LabVIEW
    By: Sam ShearmanAs a part of collections:"SubVI Specifications for "Communication Systems Projects with LabVIEW"", "Communication Systems Projects with LabVIEW"

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util_EdgeDetector.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to detect edges (transitions) in a bitstream.

Table 1
LabVIEWtop.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

Note:

Visit LabVIEW Setup to learn how to adjust your own LabVIEW environment to match the settings used by the LabVIEW screencast video(s) in this module. Click the "Fullscreen" button at the lower right corner of the video player if the video does not fit properly within your browser window.

LabVIEW SubVI: util_EdgeDetector.vi

  • Description: Detect edges (transitions) in a bitstream, and indicate rising edge, falling edge, or either edge as three distinct outputs.
  • Category: General-purpose utility ("util" prefix)

Inputs (Controls)

  1. bitstream in -- 1-D array of Boolean

Parentheses ( ) indicate default value; square brackets [ ] designate units.

Outputs (Indicators)

  1. rising edge -- 1-D array of Boolean
  2. falling edge -- 1-D array of Boolean
  3. either edge -- 1-D array of Boolean

Required Behavior

  • Each of the three Boolean output indicators is an array of the same size as the input bitstream.
  • rising edge is T whenever the the input bitstream sequence changes from F to T.
  • falling edge is T whenever the the input bitstream sequence changes from T to F.
  • either edge is the logical "OR" of the previous two indicator outputs.

LabVIEW Coding Tips

View the screencast video in Create a SubVI in LabVIEW to learn the mechanics of subVIs.

Refer to the Figure 1 screencast video for LabVIEW coding tips and techniques specific to this subVI.

Figure 1: [video] LabVIEW coding tips and techniques for util_EdgeDetector.vi
Figure 1 (subVI_util_EdgeDetector-vi.htm)

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

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