دوره 6، شماره 1 - ( 6-1387 )                   جلد 6 شماره 1 صفحات 24-38 | برگشت به فهرست نسخه ها


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Ranjbar P. Vibrotactile Identification of Signal-Processed Sounds from Environmental Events Presented by a Portable Vibrator: A Laboratory Study. IRJ. 2008; 6 (1) :24-38
URL: http://irj.uswr.ac.ir/article-1-274-fa.html
Vibrotactile Identification of Signal-Processed Sounds from Environmental Events Presented by a Portable Vibrator: A Laboratory Study. مجله انگلیسی زبان توانبخشی. 1387; 6 (1) :24-38

URL: http://irj.uswr.ac.ir/article-1-274-fa.html


چکیده:   (2710 مشاهده)

Objectives: To evaluate different signal-processing algorithms for tactile identification of environmental sounds in a monitoring aid for the deafblind. Two men and three women, sensorineurally deaf or profoundly hearing impaired with experience of vibratory experiments, age 22-36 years.

Methods: A closed set of 45 representative environmental sounds were processed using two transposing (TRHA, TR1/3) and three modulating algorithms (AM, AMFM, AMMC) and presented as tactile stimuli using a portable vibrator in three experiments. The algorithms TRHA, TR1/3, AMFM and AMMC had two alternatives (with and without adaption to vibratory thresholds). In Exp. 1, the sounds were preprocessed and directly fed to the vibrator. In Exp. 2 and 3, the sounds were presented in an acoustic test room, without or with background noise (SNR=+5 dB), and processed in real time.

Results: In Exp. 1, Algorithm AMFM and AMFM(A) consistently had the lowest identification scores, and were thus excluded in Exp. 2 and 3. TRHA, AM, AMMC, and AMMC(A) showed comparable identification scores (30%-42%) and the addition of noise did not deteriorate the performance.

Discussion: Algorithm TRHA, AM, AMMC, and AMMC(A) showed good performance in all three experiments and were robust in noise they can therefore be used in further testing in real environments.

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نوع مطالعه: پژوهشي |
دریافت: ۱۳۸۷/۳/۱۸ | پذیرش: ۱۳۸۷/۴/۲۷ | انتشار: ۱۳۸۷/۶/۱۱

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