NETWORK SYNTHESIS 



659 



10 20 30 40 50 60 80 100 200 300 400 600 1000 



PHASE ANGLE IN DEGREES AT TOP USEFUL FREQUENCY 



(multiply by 2 FOR ALL-PASS NETWORKS) 



Fig. 11 — Estimated error for n natural modes approximating linear phase. 



3 



0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 



CO/COq 



Fig. 12 — Error when six natural modes approximate a linear phase, with a 

 slope giving 402° at top useful frequency. 



