and denote the singular
value decomposition of *G(j**w**0**) *by

where *r* is the rank of *G(j**w**0**)* and *u**i **,v**i* have unit length.

If *w**0**<* ¥, write *v**1**(j**w**0**)* as

where *a**i*Î**R** is such that *q**i*Î(-p,0]. Now let *0 **£** **b**i** **£** **¥* be such that

(with *b**i**=**¥* if *q**i**=0* ) and let *f* be given by