I am trying to make a 3dB/oct High-Pass Filter, maybe it can call "half-order"?
Because as I know the basic order for the first-order filter is 6dB/oct, but how can I make a 3dB/oct filter?
here is the 200Hz 6dB/oct High pass filter:
but how to make 200Hz 3dB/oct High pass filter, which slope is more gentle than the 6dB/oct.
You can trick a low-shelf filter into approximating your desired response. By setting its fo = 26 Hz, slope factor = 0.21, and boost = -25 dB, you get the result shown below -- a highpass…