Reply To: Sampling rate of Tobii Eye Tracker 5 is abnormal

[Hongbin Zou]

Huh, the data rate issue I asked months ago is now raised again:

Tobii 5 – ONLY 33Hz for sampling frequency?

Fulin is right. Using the same code snippet, I can also get 90 gaze points per second with Tobii Eye Tracker 4C, while 33 with Tobii Eye Tracker 5. Note that Fulin’s code actually contains information about sampling rate. Collect 2000 data points and using the first and the last timestamps, we can calculate the time interval, then the sampling rate.

And this sampling rate is almost the same as the “output_frequency” param retrieved using the Stream Engine API, that is 33hz for ET5 / 90hz for 4c.
In c# I am using the “Interop.tobii_get_output_frequency(deviceHandle, out SamplingFrequency)” function.