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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_BitClock.vi

Module by: Ed Doering. E-mail the author

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Summary: Build a LabVIEW subVI to create a bit clock signal based on a free-running oscillator with a sync input.

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_BitClock.vi

  • Description: Create a bit clock signal based on a free-running oscillator with a sync input. The bit clock signal is a square wave oscillating at a nominal frequency. The oscillator phase resets when the synchronizing input pulse is active.
  • Category: Bitstream regeneration ("regen" prefix)

Inputs (Controls)

  1. restart bit interval -- 1-D Boolean array
  2. nominal frequency [Hz] -- DBL
  3. fs [Hz] -- DBL

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

Outputs (Indicators)

  1. bit clock -- 1-D Boolean array

Required Behavior

  • bit clock is the output of a square wave oscillator represented as a Boolean array. The nominal oscillation frequency is determined by the inputs nominal frequency in Hz and the system sampling frequency fs, also in Hz.
  • The bit clock output array is the same length as the input array restart bit interval.
  • The oscillator phase resets anytime that restart bit interval is T, thereby synchronizing the bit clock to the beginning of a bit interval as detected by another system.

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_BitClock.vi
Figure 1 (subVI_regen_BitClock-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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