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  • LV Digital Comm display tagshide tags

    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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    ""Communication Systems Projects with LabVIEW" features ten projects that draw upon a library of over 40 subVIs constructed as part of the project activities. Each module in this manual completely […]"

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regen_FrameSync.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to establish frame sync on a bitstream containing a standard preamble plus message, and then return the message portion of the 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: regen_FrameSync.vi

  • Description: Establish frame sync on a message containing a standard preamble, and then return the message portion of the bitstream. The bitstream must satisfy the following requirement: (1) Message frame size = 10 bits (start bit, 8-bit character, and stop bit), (2) start bit = F, stop bit = T , and (3) message is preceded by one frame containing the 8-bit value 0xFF. Requirement (3) can equivalently be restated as the preamble must end with 9 consecutive T values.
  • Category: Bitstream regeneration ("regen" prefix)

Inputs (Controls)

  1. bitstream in -- 1-D Boolean array

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

Outputs (Indicators)

  1. bitstream out -- 1-D Boolean array
  2. message detected? -- Boolean

Required Behavior

  • Search bitstream in for 9 consecutive T values, and return the remaining array as bitstream out. Return an empty array if the required pattern is not found.
  • Set message detected? to T if the required pattern is found.

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 regen_FrameSync.vi
Figure 1 (subVI_regen_FrameSync-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.

What is in a lens?

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What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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