CARRIER NATURE OF SPEECH 



507 



Fig. 5 — The voder being demonstrated at the New York World's Fair. 



cuit, the arrangement in Fig. 2 will be followed with sufficient detail 

 to show the functional relations of the parts discussed in this paper. 

 Figure 6 gives a block diagram of the voice mechanism of Fig. 1 

 with approximating electrical circuit symbols. The same communica- 

 tion paths can be traced. Thus from the talker's brain are sent nerve 

 impulses that set up the message as a set of muscular displacements 

 containing information as to the voice carrier to use, the fundamental 

 frequency for the voiced carrier, and the selective transmission of the 

 vocal tract. The air expelled from the lungs sets up as carriers the 



