122 



BELL SYSTEM TECHNICAL JOURNAL 



It is plain from curve E that the response of the system is a maxi- 

 mum of frequencies in the neighborhood of 2,250 cycles. If, now, the 

 observations already corrected for varying volume and for area of 

 resonance curves, are subjected to further correction for the exaggera- 

 tion of these frequencies, it is possible to draw a curve which shall 



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Fig. 4 — Energy-Frequency Characteristics of the Apparatus 



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Fig. 5 — Analysis of Individual Voices 



