These are new FE filters for downsampling and upsampling. We will be going from native hardware sampling rates of 64k down to 32k, 16k, and 2k.
The attached plot shows these filters. They are 3dB ripple, 40 dB stopband, 4th order elliptic filters in which I have moved the zeros around
into good places (e.g. to the Nyquist frequency).
I'm also attaching the .txt file containg the filter coefficients and the design strings. The filters are called x2, x4, and x32, for the
D2, D4, and D32 downsampling, respectively. |