376 



BELL SYSTEM TECHNICAL JOURNAL 



IV. Range of Audition in Frequency and Intknsity 



In Fig. 1 the lower curve is a plot of the average sensitivity 

 values given in Table I. The upper curve gives the pressures that 

 produce a sensation of feeling and serves as a practical limit to 

 the range of auditory sensation. (Wegel, Bell Tech. Jour., 1, p. '^^^, 



e 32 64 128 256 512 1024 2048 4096 8192 16354 rREOUtUCY D.V. 

 300 400 SCO 600 100 BOO 900 lOOO 1100 1200 1300 1400 PITCH UNIfS. 



Fig, 1 



November, 1922.) In\estigators vary from about S to 10 il\ Inr 

 the lower pitch limit and from about 12,000 to 35,000 dv for tlic 

 upper limit. (See I.) The values of 20 and 20,000 dv shown (ni 

 the chart were taken as being most representative. Half of the 

 observations lie within the dotted curves. The pitch is equal to 

 100 logo iV and the sensation units equal to 20 log P where iV is the 

 frcciuency and P is the pressure. (Fletcher, Joiir. Frank. Inst., 194, 



\' 



