© 1988 by Institute of Mathematics and its Applications
A Generalized Frequency Response for Nonlinear Systems
Department of Control Engineering, University of Sheffield Mappin Street, Sheffield S1 3JD
The principal aim of this paper is to present the idea of generalized frequency response of a nonlinear input-output map Sxo. It is defined as 
· Sxo ·
-1
where 
is the canonical isomorphsim from the weighted space L2w[0,
] to
2 with respect to a given basis
for L2w(0 ,
) and the standard basis for
2. Realization results are presented pertainig to the linear, bilinear, and nonlinear cases.