butterworth passband filter transfer function in matlab

hello,

i am using the function butter as a butterworth passband filter but i need its transfer function order n

thanks in advance

Answer 1

[Star Strider]

The butter function returns the numerator polynomial ‘b’ and denominator polynomial ‘a’ of the transfer function as vectors if you request it:

[b,a] = butter(n,Wn,ftype)

See the documentation for details.

[djamaleddine djeldjli]

i need the transfer function formula

[Walter Roberson]

tf(b,a) on the results of calling butter()

[djamaleddine djeldjli]

thank you very much it is working