BioSemi.nl

The above CFG is for ActiveTwo.

Please download the ActiveThree CFGs from https://www.biosemi.com/download/CFG_fi ... view10.zip

Best regards, Coen (BioSemi)

Which "analog box" exactly are you talking about ?

It must be something else than a BioSemi AIB (https://www.biosemi.com/aib.htm) because the BioSemi box only has a digital optical output (and it is unlikely that you can measure anything meaningful from this optical data stream).

ActiveTwo Mk1 and Mk2 (as well as the new ActiveThree) systems use exactly the same BDF file format (https://www.biosemi.com/faq/file_format.htm). In particular, storing of the 16 trigger lines in the Status channel is the same for all systems. The only difference between Mk1 and Mk2 files is the MS...

Use the current 9.02 version, it works with every ActiveTwo system (even as old as from 2002). You might have to upgrade the firmware of your USB-receiver to use it with Windows 10/11, see https://www.biosemi.com/faq/install_USB.htm.

Best regards, Coen (BioSemi)

The BioSemi system has DC amplifiers, there is no high-pass filter. Check the signal in ActiView with the (display) filters switched off. You have either a high-pass in your file reader, or you have capacitively coupled the trigger line to the Analog Input Box.

Best regards, Coen (BioSemi)

With the triggered hyperscanning method, the data files from the two (or more) systems are merged into a single hyperscanning file offline. So it is not possible to stream hyperscanning data during the recording.

Best regards, Coen (BioSemi)

According to the LSL website it should work with ActiveTwo (2 and 2.5), but that's all I know.

Best regards, Coen (BioSemi)

You can Hyperscan with the Active3 and Active2.5 system using the method described on https://www.biosemi.com/faq/Hyperscanni ... erface.htm .

It is not possible to use LSL for ActiveThree Hyperscanning.

Best regards, Coen (BioSemi)

Send the red receiver to BioSemi, we will replace it with a white one (we still have a few).

Best regards, Coen (BioSemi)

ADC11 are Mk1 systems (20 years old), they do not work with the new red receiver. You should use the older type white receiver.

Best regards, Coen (BioSemi)

What is the serial number of your AD-box ?

Best regards, Coen (BioSemi)

The CFG file stores all ActiView control settings, the channel labels, and a few system settings (e.g. how response switch signals are linked to triggers). ActiView opens with the default.cfg file. On the About/Configure tabpage, you can read a CFG file (for example a CFG with 32-chan settings and 1...

Google on "opamp buffer output impedance". With active electrodes, the electrode impedances in the interference paper (Ze in Fig. 1) are reduced from tens of kOhm to less than an Ohm, and the magnitude of interference is reduced with the same ratio.

Best regards, Coen (BioSemi)

1. What is the definition of offset? The electrode-gel-skin interface forms a galvanic half-cell. The half-cell potential is determined by the electrode metal. The offset voltage is the potential difference between two of these half-cells. When the electrodes are identical (same metal and perfectly ...

The above is not a standard option in ActiView that can be enabled with a CFG setting. Bipolar display for all channels would require changing the (open source LabVIEW) source code.

Best regards, Coen (BioSemi)

Reference the data. After referencing, the locations of CMS and DRL are not relevant anymore.

Best regards, Coen (BioSemi)

That depends on whether the evoked responses also alternate in polarity. With ABR for example, that's not the case (so the noise trace still shows the noise).

Best regards, Coen (BioSemi)

The trigger port needs TTL level signals. In order to connect an audio line signal, you will need to convert to TTL with a comparator and flip-flop. The accuracy of trigger timing is one sample length, see https://www.biosemi.com/faq/review_trigger_timing.htm

Best regards, Coen

It is a custom made system for 16+3 channel ECG (LA RA LL is the Wilson Central Terminal). It is probably something like 20 years old. Please email the serial number to info@biosemi.com, and I can check which upgrades are still possible. Soundcard to trigger interface can be done with the ERGO-OPTIC...

Do not edit CFGs in Notepad.

Open ActiView, set the controls according to your preferences, make a short data file, select the "about" tabpage and save your front-panel settings in a new CFG.

Best regards, Coen (BioSemi)

No, best regards, Coen (BioSemi)

Yes

Use ActiTools --> Editor (https://www.biosemi.com/download/ToolsF ... 02-Win.zip)

Best regards, Coen (BioSemi)

Why don't you measure simultaneous EEG and ECG (extra TP-flat electrodes) with the BioSemi system ?

Best regards, Coen (BioSemi)

Select the "analog" trigger format and trigger line 1-16 are displayed as colored dots/bars. Select the "decimal" trigger format and the triggers are displayed as two groups of 8 bit numbers.

If the triggers are received, then they are shown in ActiView.

Filtering the TCP outputs is not a standard option in ActiView, it is only possible by modifying the (open source LabVIEW) code. You could consider programming a simple low pass in you C++ client. High frequency interference on the photo sensor signal is usually caused by 100 Hz fluctuating light fr...