Smithsonian Report, 1946.—Potter PLATE 1 
3000 
2000 9 
[o) 
Oo 
Ww 
1000 
a 
Ww 
a 
) ”) 
se Bist focaccia i a Na eC Ww 
3 
> 
FIG.1 (a) > 
= ee Se = —- S 
3000 3 
; Ze 
j lw 
3 
42000 w 
3 a 
| w 
41000 
Be] 
ea fe) 
FIG.1 (b) TIME IN SECONDS 
Fic. 1 (a).—High-detail sound spectrogram of the words ‘‘This is visible speech,” 
showing the darker regions of mouth cavity resonance superimposed upon the 
detail of harmonies in voiced sounds. 
Fie. 1 (b).—Low-detail sound spectrogram of the same words, showing the res- 
onant regions as dark bands and eliminating detail. 
