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regen_BitClock.vi

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

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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Definition of a lens

Lenses

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.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

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.

| External bookmarks

Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

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.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

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.

| External bookmarks