laminar

laminar - Massachusetts Institute of Technology Department...

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Unformatted text preview: Massachusetts Institute of Technology Department of Electrical Engineering & Computer Science 6.345 Automatic Speech Recognition Spring, 2010 Laminar User Guide 1 Introduction to laminar The laminar (Line Analog Models for Interactive Articulation Research) facility is capable of synthesizing speech from different vocal tract configurations. The system is based on an enhanced version of the Kelly-Lochbaum acoustic-tube model, and computes impulse responses of static vocal tract configurations. By allowing the user to interactively alter vocal tract areas, losses and sources, laminar provides a useful mechanism for studying the acoustic theory of speech production. As illustrated in Figure 1, laminar will provide the tools to model vocal tracts and generate their corresponding outputs. matlab will then be used to plot the output waveform and spectrum. The following sections provide information necessary to be able to use the system effectively. 1.1 Vocal Tracts All investigations in laminar center around the vocal tract. Currently, the vocal tract is modeled as a sequence of N elements, each of length x . The vocal tract length L , is thus Nx . Each element has an area A , and may also include some kind of loss or source. In laminar , a list of all vocal tracts is kept in the Tracts window. The vocal tract area function of a particular tract may be displayed by selecting a tract in this window. This is done by positioning the mouse pointer over the tract of interest, and clicking the left mouse button once. The name of the currently selected tract is always highlighted in the Tracts window. 1.1.1 Vocal Tract Commands In addition to selecting an existing tract, a user can also create a new tract, make a copy of, alter, or delete a selected tract. Any of these four operations may be invoked by positioning the mouse pointer in the Tracts window, clicking the right mouse button, and then selecting the appropriate command in the resulting pop-up menu. 1 Figure 1: The laminar window illustrating the vocal tract of an [i] and the corre- sponding output waveform and spectrum plots in matlab. 2 If the Create Vocal Tract command is selected a Create Vocal Tract window will appear containing default values for the vocal tract length, the number of sections in the vocal tract, the sampling rate used for synthesis, as well as the name of the vocal tract itself. Any of these values may be changed by the user. To change a parameter value, position the mouse pointer over the appropriate value, click the left...
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This note was uploaded on 05/08/2010 for the course CS 6.345 taught by Professor Glass during the Spring '10 term at MIT.

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laminar - Massachusetts Institute of Technology Department...

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