.( I') .\.i.\uc.-ii. STuny oi- nii-. n-ii /;/. mH'nds 237 



r<)ni(H)ru'nt is tli-tt'rmiiu'd liy tlu' rortitu-r oiKpiit, the sensitivity factor 

 of the seleniuni cell and tlie .irea of ilie fre(iiiency resfX)nse curve oi 

 tlie tuning; apparatus. 



Since the wave form of a vowil mhiiuI i> not ,i true periodic func- 

 tion, it is representetl analyticalK' l)\' a I'Ourier Integral, not by a 

 Fourier Series. The continued repetition of the motion of the wave 

 past the sHt, however, builds up a peri(xiic function consisting of 

 a fundamental and a series of harmonics. The magnitudes of these 

 components bear a simple relation to those of the infinitesimal com- 

 ponents of corresponding frequencies in the Fourier Integral. It 

 is this series of harmonics which is measured by the above method, 

 hence the problem of analyzing the aperiodic function represented 

 in the record is solved by means of the related periodic function. 



