234 



BELL SYSTEM TECHNICAL JOURNAL 



10 



10" 



I 10 2 



SlO-3 



0.1 0.2 03 0.4 0.5 0.6 0.7 0.8 0.9 10 



FREQUENCY 



Fig. 7 — Low pass filters with a = 1/6. Envelopes of phase departures. 



•^ 100 



"=> 80 



5 40 



20 



0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 



FREQUENCY 



Fig. 8 — Low pass filters with a = 1/6. Attenuation. 



