Replay BDF files in ActiView

[rayoverweij]

Hi!

Is anyone aware of a way to replay BDF files in ActiView, as a way to simulate data coming in by using older files? We are building Python code that reads out data from ActiView over TCP/IP and it would be a lot easier if we could test this using old files instead of hooking up a real person to the rig.

Let me know if you need more information and thanks in advance!

- Rayo Verweij

[Coen]

No need to hook up a subject:

1) Use "one bucket" method (see manual), make waves in the data by shaking the bucket.
2) Use "two bucket" method and use a signal generator with passive Ag-AgCl electrodes in the buckets.
3) If you have an AIB: select speedmode 4, 5, 6 or 7 and connect a signal generator (gain is 1/4th compared to regular AD-box), don't forget to set speedmode 8 after the test.

Best regards, Coen (BioSemi)

[rayoverweij]

Thanks for the reply! I just had a follow-up question: do you have somewhere documented in what format the ActiveTwo sends channel data over TCP/IP? We want values in μV for every channel, but we're getting wildly varying numbers.

Thanks again,
Rayo

[Coen]

24-bit data. little endian, with LSB = 31.25 nV. Signals are DC, so uV EEG superimposed on tens of mV offset (apply high-pass filter to cancel offsets).

Best regards, Coen (BioSemi)