Page History: LSL Signal Element
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Page Revision: 2023/05/11 04:29
Summary
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LSL Signal
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| Info |
| Category: |
Signal Acquisition |
|
AddIn: |
LSL |
| Creator: |
OkazoLab |
|
Scope: |
Experiment |
| Owns Snippets: |
None |
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Usage: |
Snippets |
Properties
| Name | Description | Constraints | Type | On
runtime
change |
|---|
| LSL Settings |
| Stream Type | Defines the LSL stream that delivers signal data | | String | |
| LSL Stream | Defines which LSL stream will be connected at runtime. You must have the LSL stream running, when you change this property for the first time. Note that the channel configuration of the element is updated each time as you change this property | | String | |
| Request Configuration | Retrieves a new channel configuration of the selected LSL stream, if it has been changed after the stream selection. | | Boolean | |
| Channel Configuration |
| Actual Sampling Rate | Returns the actual sampling rate of connected hardware after it the configuration request | | Double | |
| Sample Type | Returns the actual sampling rate of connected hardware after the configuration request | | String | |
| Chink Size | Defines the chuck size (in ms) in signal acquisition | | clTime | |
| 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. | | List`1 | |
| Selected Channel Count | Indicates how many signal channels are currently selected for acquisition | | Int32 | |
| Total Channel Count | Indicates how many signal channels are available for acquisition in the total | | Int32 | |
| Buffer Size | Defines the size (in samples) of a circular buffer that stores incoming signal data. | | Int32 | |
| Signal Generator |
| Signal Generator | Defines whether signal samples are produces by an oscillatory generator rather than the actual hardware. You can use the signal generator for test runs without hardware | | Boolean | |
| Emulated Sampling Rate | Defines the emulation sampling rate (samples per second), when data is generated or streamed from a file. | | Double | |
| 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. | | 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. | | 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. | | Double | |
| Runtime Control |
| Reset Signals Now | Runtime commands that resets the signal buffers and data acquisition | | Boolean | |
| Control |
| Is Enabled | If set to false the element is completely omitted when the experiment is run | | Boolean | |
| Title | Title of the element | | String | |
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The LSL Signal element reads and buffers an incoming LSL stream generated either by hardware or other applications.
Description
An increasing number of reseacrh hardware and applications add support for the lab streaming layer (LSL) is a protocol, which is designed for the unified collection of measurement time series in research experiments that handles both the networking, time-synchronization, (near-) real-time access as well as optionally the centralized collection, viewing and disk recording of the data. You can find more details on the
LSL project site. The LSL protocol was developed in Swartz Center for Computational Neuroscience, UCSD.
The LSL Signal element in EventIDE automatically detects active LSL streams that are generated by research hardware or other applications on the same computer or in a network. Each LSL stream can carry multiple channels, which are treated as separate signals by the LSL Signal element. The element allows you to select one or more channels for processing. Note that the LSL protocol can transfer data in a wide range of formats. The LSL Signal element can only process numerical channels (double, float or integer).
As you start your expeirment, the LSL signal element begins reading incoming LSL channels and buffering signal samples for futher online analysis, visualization and recording, carried by other EventIDE elements
Snapshots
 Snapshot 1
| Snapshot 2 |
Practical Use
Technique 1
- Step 1
- Step 2
Technique 2
- Step 1
- Step 2
// Check the trial outcome. Result and RT just other user variables
// insert code snippet here..
Notes
- Insert Notes here..
- Insert Notes here..