I am trying to setup a Rpi to record vibrations from local traffic. I am using an inexpensive seismometer plugged into the Cirrus. Is there a filter on the board that filters out frequencies that are lower than 50Hz (for example)? In the spec sheet there is an fcut value, but I have no idea what that relates to. I am using the Mic Line In with the setup scripts.
Ah yes I can see that now. So the soundcard is being controlled by alsamixer (amixer) via the python setup scripts. Are there any hardware high pass filters present on the chip that aren't controlled externally? e.g. any filter that drops frequencies below a threshold, because in the normal realm of human hearing they aren't needed (but in the realm of seismology, they are needed). I still dont know what that fcut value is or even if it's relevant. I cant get the WM5102 datasheet as it appears to be no longer present.
I can view the schematic of the Wolfson card Line In, but I don't understand how the resistors and capacitors might effect the sound (at the hardware level). What I am looking to understand is does the Cirrus card filter out frequencies that I am interested in? (de-wowing?)
