7.0 MSEC 



#«%/>;y''\> '*K\/\>y^-'^ 



II 



100-200 CYCLES 200-400 CYCLES 400-800 CYCLES 



K— --jim — 



800-1600 CYCLES 1600-3200 CYCLES 3200-6400 CYCLES 



6400-12.800 CYCLES 12,800-25.600 CYCLES CALI B RATE = 1000 CYCLES 



Figure 18. Waveforms produced by resonant spark sound source. 



40 



