LOUDNESS 



405 



To determine the value of h for this range in terms of A/ and Lk, a 

 series of loudness measurements was made upon complex tones having 

 ten components with a common difference in frequency A/ and all 

 having a common loudness level L/.. The values of A/ were 340, 230, 



10 20 30 40 50 60 70 80 



LOUDNESS LEVEL OF EACH COMPONENT-DB 



pig_ 9— Loudness levels of complex tones having ten equally loud components 100 



cycles apart. 



112 and 56 cycles per second. The fundamental for each tone was 

 close to 1000 cycles. The ten-component tones having frequencies 

 which are multiples of 530 was included in this series. The results of 

 loudness balances are shown by the points in Fig. 10. 



By taking all the data as a whole, the curves were considered to 



