! | 









63 » 2 II + 1 

































Figure k. Variation of the cutoff frequency /- for the 

 Gaussian filtering function. Here the filtering interval T 

 is oaken equal to 6 or, since beyond 3 a from the origin the 

 normal curve ordinates have negligible values. The cut- 

 off frequency f c decreases with increasing 0, and hence is 

 governed by its value. 



\ N 

 \ V 



NORMAL CURVE 

 — __ SMOOTHING 

 FUI.oTJ.ON 

 <V RESPONSE 

 N CURVE 



EvJUALiK 

 —— WEIGHTED 

 RUNNING 

 MEAN 

 R73P0N3E 





\ 





1 ■ 



60 ■ 



1UC6) * 

 2 N * 1 













0.02 0.01* 0.06 0.08 



FREQUENCY, CYCLES PER DATA INTERVAL 



Figure 5- Frequency response of a forty -one term equally 

 weighted running mean (#=20) compared with an equivalent 

 normal curve smoothing function. 



Ik 



