I want to design a bandpass filter (BPF) using a FIR filter by the window method.

I have $f_{c1} = 3\, \mathrm{kHz}$, $f_{c2} = 6\, \mathrm{kHz}$ and slope is $-80\, \mathrm{dB/dec}$. How can I find $f_{s}$ and order of filter?


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