Can you try running this in a REPL to see what the return value of firdes.lowpass(...) is?
--M On Tue, Jan 25, 2022 at 2:03 AM Michelle <mkprojects...@gmail.com> wrote: > hello, > > I'm using a FIR filter and I have the error : "Param - Taps(taps): > Expression None is invalid for type'complex_vector'." > > my taps is : firdes.low_pass ( 1, samp_rate, frec_carrier, > 25000,firdes.WIN_HAMMING ) > > samp_rate and frec_carrier are both variables in my graph. > > I don't understand why I have an error. Please could you tell me what I > am doing wrong? > > > Thank you. > >
