Welcome Guest, you are in: <root>Elements • Login

Page History: PSD Analyzer Element

Compare Page Revisions

11 10 9 8 7 6 5 4 3 2 1 0 Current 11 10 9 8 7 6 5 4 3 2 1 0

« Older Revision - Back to Page History - Newer Revision »

Page Revision: 2014/12/27 19:24

The element allows to perform a simple power spectrum (PSD) analysis on a real-time signal that is provided by the signal acquisition elements in EventIDE.

Table of Contents [Hide/Show] Actions aligned with epochs of the parent event Notes Properties     Generic Properties Description Snapshots Practical Use     Technique 1     Technique 2 Element actions aligned with different epochs of the parent event Notes Properties     Generic Properties

Description ¶

The signal acquisition elements, e.g. OpenViBE Signal, communicate with recording hardware and buffer incoming data samples at the background of the experiment. In order to access the buffered data, you can use PSD Analyzer. The element operates on a single signal estimating and plotting power spectrum of the signal with the FFT. The estimation is run cyclically in the control loop of the parent event. The estimation is done within a analysis window that embraces the selected number of recent samples. The results include the descriptive statistics over the signal window: dominant frequency and its power. Other statistics can be done manually, hence the element delivers the FFT output as an array of double numbers. When power spectrum monitoring is required, the element generates a live bar plot, which can be placed on the Status Screen (see the snapshot below).

Snapshots ¶

Snapshot 1

Snapshot 2

Practical Use ¶

Technique 1 ¶

1. Step 1
2. Step 2
   

Technique 2 ¶

1. Step 1
2. Step 2
   

 // Check the trial outcome. Result and RT just other user variables
// insert code snippet here..

Element actions aligned with different epochs of the parent event ¶

Epoche	Actions
Initialized	The camera starts capturing video
Rendered
Activating
Activated
Running	The camera output is captured and rendered via the Video Output property, if the latter is bound to the status screen
Deactivated
Deinitialized	The camera stops capturing video

Notes ¶

Insert Notes here..

Properties ¶

Generic Properties ¶

Name	Description	Constraints	Value Type	Upon Runtime Change
Settings
name	description	attributes Design Time.. Designtime Command.. Status.. Normal.. Runtime Command.. WriteOnly..	type String	Visual Update..

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String