Isidro Gonzalez wrote:
so is it possible to get the gain from the poles and zeros, without calculating all coefficients?
Of Course it is. You must evaluate the transfer function of the filter in the unit circle. For a nice explanation on how to do this and some C code samples, see: Elements of Computer Music by F. R. Moore, Cap.1 pp. 119-133
thanks for the hints. i will see if i can find this book somewhere.
bis denn! martin