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Software for Characterizing Laryngeal Dynamics

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: 1 R43 DC02343-1,
Agency Tracking Number: 25001
Amount: $75,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 1994
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
4 Militia Drive, Suite 20
Lexington, MA 02173
United States
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Joel Macauslan
 (617) 861-2996
Business Contact
Phone: () -
Research Institution

Our company will create a software "tool" to characterize aspects of the structure andperformance of the larynx from analysis of speech. The analysis relies on the theory of nonlineardynamical systems, or "chaos theory". It provides parameters (Lyapunov exponents, metric entropy,attractor dimensions) which cannot be derived from conventional reduction but which have already beenshown to have value in characterizing the larynx as a dynamical system. The technique is non-invasive,and the software will accept continuous speech and even some unrequested vocalizations, as fromneonates. The tool will be capable of detecting both unusual glottal periodicities and completeaperiodicity (chaos). There are both physiological and mathematical reasons to expect some distinctpathologies to excite distinct dynamical responses which the tool can distinguish. Phase I will verify thatthe tool can reliably determine the exponents and the attractor dimensions for entries in an existingdigital data base of vocalizations; show that the parameters identify distinct modes of stable vibration;and determine the extent to which the parameters vary with known laryngeal conditions. If successful,this software will provide a new set of clinical "measurements" for assisting in the diagnosis of laryngealpathologies. It can then provide objective corroboration for clinical judgments.

* Information listed above is at the time of submission. *

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