Choose the online processing for your recording in the Setup window. If an online processing is defined, the channel names and the according digital trigger values which are processed while recording can be chosen here. The window size [s] and the Delay after trigger [s] define the signal piece which is processed while recording. If Delay after trigger [s] is positive, the signal piece starts x seconds after the according digital trigger is detected. If the value is negative, the signal piece starts x seconds before the digital trigger is detected. The basic setting for the online recording and also the additional window after recording is the window size [s] and the delay after trigger [s]. Be sure that the digital trigger duration is longer than the window size. If the window size is longer than the digital trigger signal, a mix of multiple signal pieces is the result. While recording, the online processing works with a rotating buffer which stores # pieces signals. After the recording is finished, the result for all recorded signals is calculated an not only the latest signals stored in the rotating buffer. Online Processing Please note: Online processing functionality depends on the selected dongle. Online processing only works when a digital trigger is recorded. The content of the rotating buffer if shown in two separate windows. Select the amplitude per channel for this plot.
The last signal piece added to the rotating buffer can be deleted with pressing Skip. Skip will also delete the entry from the trigger file and therefore ensure that this signal piece is not used in the online processing window after finishing the recording. The top of the Online Processing register shows two windows which contain the mean +- standard deviation of the rotating buffer. An update of the mean signal is done with each new signal piece. The online processing register contains two pairs of cursors, the M-Cursors and H-Cursors. which can be moved within the bottom left buffer window. Set the M-Cursors to the beginning and the end of the muscle reflex. Set the H-Cursors to the beginning and the end of the Hoffmann reflex. Afterwards, the reflex size and delay after trigger are calculated. This is done in searching the maximum value and the minimum value within the cursor pairs. The amplitude is calculated as maximum - minimum. The maximum M-reflex size is shown and the latest reflex size is shown in % of Mmax. H-Reflex vs. Stimuli Current Please note that this function is only available in a specific version of the program. For the special Hoffmann reflex processing, a current measurement hardware is necessary. IMAGO Record searches for an impulse within the current signal and takes the mean of 3 samples to define the applied current stimulus. With this information, the muscle reflex size and the Hoffmann reflex size can be plot over the applied stimulus current.
Cycle Plot Please note that this function is only available in a specific version of the program. Choosing Cycle Plot as online processing function leads to circular graphics. The 0-line is a unity circle with a radius which can be defined by a scaling coefficient. This view was developed for rotating forces, e.g. pedal forces while cycling. However, EMG signals can also be shown with a circular 0-line.
Wireless (part of Cycle Plot) The Wireless tab shows the incoming wireless pedal force signals. Wireless pedal force signals and analog signals can be combined in one recording. Superimposed Traces The superimposed traces online processing is not available while recording. It allows the selection of specific signals and an export to text file or a plot. For more information click here. SVIFT processing Special processing for University Hospital Freiburg, Janine Reis Channel Compare Compares two channels with each other. Parameters can be calculated based on this comparison.