29-08-2017, 12:56 PM
The 275 muW analog vocal tract chip includes a 16-stage cascade of two-port pi elements that form a tunable transmission line, electronically variable impedances, and a current source as a glottal source. A nonlinear resistance model laminar and turbulent flow in the vocal tract. The SNR measured at the output of the vocal tract is 64, 66 and 63 dB for the first three vocal tract resonances with uniform cross-sectional area. The analog voice tract can be used with auditory processors in a closed feedback voice loop-analogous to a phase locked loop-to implement voice recognition that is potentially robust in noise. Our use of a physiological model of the human vocal tract allows the analog vocal tract chip to synthesize speech signals of interest, using articulatory parameters that are intrinsically compact and linearly interpolable.