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analogdevicesinc / ad936x-filter-wizard

MATLAB-based FIR filter design
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No way to design a filter which Fpass = Fs/2 #25

Open rgetz opened 7 years ago

rgetz commented 7 years ago

Michael pointed out:

If you want a filter which is basically flat, with no attenuation anywhere (just to enable the decimation), this isn't possible.

Setting datarate to 10, fpass and fstop to 5, FIR to x4 : Design filter just returns nothing.

I think this was the "equalize" option (that isn't implemented yet). -Robin

tfcollins commented 7 years ago

The way we configure the Parks-Mcloughlin algorithm currently is basically fighting this design strategy. I can change things and basically enable this passband mode if that’s we want

rgetz commented 7 years ago

I expected as much - I think that is why I thought it was just better to have an "equalize" option.

I would assume that if we want a flat response, the user would not select "low pass". ;)