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pam_TransmitFilter.vi

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

Summary: Build a LabVIEW subVI to convert a sequence of signal levels to a signal waveform with a user-defined pulse shape.

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: pam_TransmitFilter.vi

  • Description: Convert a sequence (array) of signal levels to a signal waveform with a user-defined pulse shape. Each element of the signal levels array generates one "analog" pulse (a sampled-value discrete-time waveform). This device is commonly called a "transmit filter" since it is implemented by an impulse train driving an FIR filter.
  • Category: Pulse amplitude modulation (PAM) ("pam" prefix)

Inputs (Controls)

  1. signal levels in -- 1-D DBL array
  2. pulse shape -- 1-D DBL array
  3. Tb, bit interval [s] -- DBL
  4. fs, sampling frequency [Hz] -- DBL

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

Outputs (Indicators)

  1. waveform out -- waveform
  2. samples per bit -- 1-D DBL array

Required Behavior

  • Each element of signal levels in indicates the amplitude of a user-defined pulse shape, which is assumed to have a unit amplitude.
  • Pulses are generated once each bit interval defined by Tb. The finished waveform waveform out is the superposition (sum) of all individual time-shifted pulse waveforms.
  • The prototype waveform waveform out may extend beyond a single bit interval.

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 pam_TransmitFilter.vi
Figure 1 (subVI_pam_TransmitFilter-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

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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