kio = €hio=€ | S(w) G2(w,—w)dw 
—c 
ko9 = hao = | sw IG1(@) do 
kon = hon = | ws(w) |Gy(w)"dw 
ky2 = €hy2 =€ | | (o102+20% 5(@1)s(W2) 
X [Gi(—@1)G1(— @2)G2(@1, @2) 
+ Gi(—@1)Gi(—@2)G7(@1,@2)] dw dw 
8 
k39 = €h39 = 3€ | S(W1)(sw2) 
8 
X [G1 @1)G1(— @2)G2(@1, w2) 
+ Gi(—@1)Gi(—@2)G2(@1,@2)] dw dw, 
where * indicates a complex conjugate, 
S(@) is the two-sided spectrum of input x(2), 
G(@) is the linear frequency response function 
G\@) = | gy(te"@ dr}, 
—c 
360 
(12.119) 
