SPEaRAL 

 SLOPE 



(b) 



LOWER 

 FREQUENCY 

 COMPONENT 



RELATIVE 

 ASPEa 

 RATIOS 

 {A/>v) 



HIGHER 

 FREQUENCY 

 COMPONENT 



b<-1 



i)>e) 



High 



AAAA/ 



Low 



b = -1 



High 



Low 



b>-l 



am 



Low High 



Figure 5-2 Relationship of spectral slope parameter (b) to aspect ratio 

 (A/x) of sinusoid at different frequencies. For b= -1, the 

 aspect ratio remains constant 1n all frequencies. For b<-l, 

 the aspect ratio Increases at lower frequencies. For b>-l, 

 the aspect ratio Increases at higher frequencies. 



54 



