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

Page History: OpenViBE Signal Element

Compare Page Revisions

22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Current 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

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

Page Revision: 2014/12/24 01:06

The element performs buffering of realtime signals (e.g. EEG) provided by the OpenViBE acquisition server (http://openvibe.inria.fr). The buffered signal data can be processed with other elements to enable different forms of the neurofeedback control in designed experiments. In order to use this element, you must have the OpenViBE platform installed.

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

Description ¶

Short description

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
Set OpenViBE folder	Defines the OpenViBE folder on a local machine	Designtime Command..	String
TCP Server Address	Defines the address of the OpenViBE TCP server. Use "127.0.0.1", if the OpenViBE acquisition server runs on the same computer.	Design Time..	type String
TCP port	Defines the port number of the OpenViBE TCP server.	Design Time..	Int32
Sample Size	Defines the sample size (in bits) of a signal streamed by OpenViBE. The value should be the same as settings of the the OpenViBE acquisition server.	Design Time..	Int32
Connection Timeout	Defines a timeout (ms) of the connection to the OpenViBE TCP server.	Design Time..	type String	Visual Update..
Channel Configuration
Request Configuration	Sends a configuration request to the OpenViBE acquisition server, which must be run beforehand. The configuration request must be made each time as the OpenViBE element is created or as the OpenViBE server settings are changed. The OpenViBE acquisition server returns the number of active channels, which can be acquired in EventIDE.	Designtime Command..

+=== Properties inherited from the base signal element === Inherited properties of the Signal Provider Element

Channel Configuration
Selected Channels	Defines what signal channels are selected for acquisition within EventIDE. Selected channels are registered in the EventIDE signal pool at runtime and become available for the signal analysis elements.	Design Time..	IList
Selected Channel Count	Indicates how many signal channels are currently selected for acquisition.	Status..	Int32
Total Channel Count	Indicates how many signal channels are available for acquisition in the total.	Status..	Int32
Buffer Size	Defines the size (in samples) of a circular buffer that stores incoming signal data.	Design Time..	Int32
Signal Generator
Signal Source	Defines a source for the signal. The emulated rhythmes can be used for offline validation of the chosen analysis settings	Design Time..	enum
Emulated Sampling Rate	Defines the emulation sampling rate (samples per second), when data is generated or streamed from a file.	Design Time..	Int32
Primary Frequency	Defines the frequency of the primary rhythm in the generated signal, in Hz. Assign the zero to exclude the primary frequency from the generated signal.	Design Time..	Double
Secondary Frequency	Defines the frequency of the secondary rhythm in the generated signal, in Hz. The secondary frequency magnitude is a half of the primary frequency magnitude. Assign the zero to exclude the secondary frequency from the generated signal.	Design Time..	Double
Noise Level	Defines the noise level (in % to the norm magnitude of the primary frequency). The noise is added to the generated signal. Assign the zero the exclude the noise from the generated signal.	Design Time..	Double
External Datafile	Opens the dialog for selecting a data file containing a stream of double numbers representing a signal. If a file name without a path is defined, the data file will be picked up in the location of the experiment file.	Designtime Command..	String

+=== 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