VOLUME RANGES OF SPEECH AND MUSIC 



327 



actually superior to a wider band due to the introduction of additional 

 noises and distortions in a wider band unless particular precautions are ob- 



ZlOO 

 u 



o 



tt 80 



(J 



60 



^20 



■D 

 O 



H 



L/ \H 



FREQUENCY 



1000 

 IN CYCLES 



10000 



PER SECOND 



Fig. 13.8. The effect of the frequency range upon the articulation of speech, i/. High pass 

 filter — all frequencies below the frequency given by the abscissa removed. L. Low pass 

 filter — all frequencies above the frequency given by the abscissa removed. (After Fletcher 

 " Speech and Hearing," D. Van Nostrand Co.) 



served. In the case of speeches, plays and songs, a limited frequency range 

 impairs the quality and artistic value of the reproduced sound. 



lOOi 



< 



=) 20 



a 



20 



fOO 1000 



CUTOFF FREQUENCY IN CYCLES 



PER SECOND 



Fig. 13.9. The effect of the frequency range upon the quality of orchestra music. H. High 

 pass filter — all frequencies below the frequency given by the abscissa removed. L. Low 

 pass filter — all frequencies above the frequency given by the abscissa removed. (After 

 Snow.) 



The effect of the frequency range ^^ upon the quality of reproduction 

 of orchestral music is shown in Fig. 13.9. It will be seen that the fre- 

 quency range required for no appreciable loss in quality is from 40 to 



19 Snow, W. B., Jour. Acous. Soc. Amer., Vol. 3, No. 1, Part 1, p. 155. 



