Document Detail

Controller design and consonantal contrast coding using a multi-finger tactual display.
MedLine Citation:
PMID:  19507975     Owner:  NLM     Status:  MEDLINE    
This paper presents the design and evaluation of a new controller for a multi-finger tactual display in speech communication. A two-degree-of-freedom controller consisting of a feedback controller and a prefilter and its application in a consonant contrasting experiment are presented. The feedback controller provides stable, fast, and robust response of the fingerpad interface and the prefilter shapes the frequency-response of the closed-loop system to match with the human detection-threshold function. The controller is subsequently used in a speech communication system that extracts spectral features from recorded speech signals and presents them as vibrational-motional waveforms to three digits on a receiver's left hand. Performance from a consonantal contrast test suggests that participants are able to identify tactual cues necessary for discriminating consonants in the initial position of consonant-vowel-consonant (CVC) segments. The average sensitivity indices for contrasting voicing, place, and manner features are 3.5, 2.7, and 3.4, respectively. The results show that the consonantal features can be successfully transmitted by utilizing a broad range of the kinesthetic-cutaneous sensory system. The present study also demonstrates the validity of designing controllers that take into account not only the electromechanical properties of the hardware, but the sensory characteristics of the human user.
Ali Israr; Peter H Meckl; Charlotte M Reed; Hong Z Tan
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  125     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-10     Completed Date:  2009-08-27     Revised Date:  2010-09-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3925-35     Citation Subset:  IM    
Haptic Interface Research Laboratory, Purdue University, West Lafayette, Indiana 47907-2035, USA.
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MeSH Terms
Electrical Equipment and Supplies*
Equipment Design
Neuropsychological Tests
Practice (Psychology)
Sensory Thresholds
Speech Acoustics
Speech Recognition Software
Task Performance and Analysis
Young Adult
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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