Acoustics

Analysis of Human Speech Voice

The Music Telegraph | Text 2020/04/20 [13:08]
Acoustics

Analysis of Human Speech Voice

The Music Telegraph| 입력 : 2020/04/20 [13:08]

© Pixabay

 

 

Analysis of Human Speech Voice

 

Human speech voices consist of three frequency bands: basic sound, vowel, and consonant. The frequency band of the basic sound ranges from 100 to 300 HZ, which determines the tone of speaker's voice. The range of vowel band is 300 to 2000 Hz, which contains the highest energy compared to the other two bands. The range of consonant band is 1500 to 4000 Hz, which has less energy but contributes the most to the clarity of sound compared to the other two bands. 

 

 

▲ Figure 1: Spectrum of human speech voice

© The Music Telegraph

 

 

▲ Figure 2: The rate of contribution to sound clarity by frequency band

© The Music Telegraph

 


'Figure 1' represents the spectrum of human speech voice, and 'Figure 2' represents the contribution rate for each band to the clarity of sound. Voices in the range of 125 - 500 Hz account for 60% of the total energy, but contribute only 20% to the clarity of sound. Voices of 1 - 4 kHz has less energy than the low bands, but the contribution rate to the clarity of sound is 75%. Voices of 8 kHz has very little energy and the contribution rate to the clarity of sound is only 5%.

 

 

 

*References
F. A. Everest, The master handbook of acoustics, TAB Books (1994)

D. Davis & C Davis, Sound system engineering, Howard W. Sams & Co. (1987)

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