NAFI TR-lUi+O 



The derivation of equation (9) utilized double -sided power 

 spectra; however^ in obtaining numerical results, it is often convenient 

 to work with single -sided spectra. The necessary modification to equa- 

 tion 9 is derived below. 



The double-sided result is (Eqn. 9) 



Letting a super A denote single-sided spectra, we have the following 

 conversions: r^^ "" 







Thus f^ 



since N(f ) is an even function. Thus 



and equation 9 can be rewritten for single-sided spectra as 





A- 2 



