Notch filter

[Kashish Parnami]

I’m recording with an RHD interface board using the RHX acquisition software. During acquisition, a 50 Hz notch filter is enabled on the BW tab for live viewing only. After recording, the saved files include amplifier.dat (wideband), lowpass.dat, and highpass.dat. When computing the LFP PSD from my saved data, there is a pronounced dip at 50 Hz.

Could you please clarify:

• Does enabling the BW‑tab 50 Hz notch apply that notch to the data written to disk for any of the saved streams (wideband amplifier.dat vs. the saved LOW/HIGH streams)?

• If the notch is written to disk when enabled, what setting should be used so that amplifier.dat remains completely raw (i.e., no 50 Hz attenuation in the saved wideband stream) while still allowing a notched display during monitoring?

• For existing recordings that already show a 50 Hz trough, is there any way to recover the original 50 Hz content ?

[Josh Siegle]

Hi Kashish,

This forum is intended for questions about the Open Ephys GUI. For the RHX software, you can contact sup...@intantech.com

Josh

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