Contributions:LSLSource

LSLSource

Function

The lab streaming layer (LSL) is a system 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. "LSLSource" can collect data from different hardware and feed it into "BCI2000" for further analysis in real time.

LSLSource Hardware

Different hardware can be connected to the LSLSource including "USBAmp" "OpenBCI" "Mouse" ... All the masters to the hardware are provide on GitHub. Some software can be downloaded from the following website [1].

Installation

The master for the hardware must be installed first. The Github link for software can be found at [2].

Parameters:LSLSource

Parameters common to all source modules are described under User Reference:DataIOFilter. In addition, the LiveAmpADC provides the following parameters:

SourceCh

The number of channels will be automatically detected by the source module. User doesn't need to set it.

SampleBlockSize

Samples per channel per digitized block. Together with the sampling rate, this parameter determines how often per second data are collected, processed, and feedback is updated. For example, at 500 Hz sampling and a SampleBlockSize of 20, the system (e.g., source signal display, signal processing, and stimulus presentation) will be updated 25 times per second. This variable will change as using different device. User can find the best sampling block size on the hardware spec sheet.

SamplingRate

The sample rate of the system. Different hardware has different sampling rate. This source module can automatically detect the sampling rate for different hardware. The sampling rate should be compatible with sample block size. In case you are experiencing problems by higher sampling rates (e.g., data loss, jerky display, etc.), increase the SampleBlockSize so that you are updating the system less frequently (usually, updating the system 20-30 times per second is sufficient for most applications), and increase Visualize->VisualizeSourceDecimation. This parameter will decrease the number of samples per second that are actually drawn in the Source display.

SourceChGain

Gain for each channel.

SourceChOffset

Offset for each channel.

ChannelNames

Names of each channel.

See also

User Reference:Filters, Contributions:ADCs