Development and Technical Validation of the Mobile Based Assistive Listening System: A Smartphone-Based Remote Microphone Purpose The purpose of this research note is to describe the development and technical validation of the Mobile Based Assistive Listening System (MoBALS), a free-of-charge smartphone-based remote microphone application. Method MoBALS Version 1.0 was developed for Android (Version 2.1 or higher) and was coded with Java using Eclipse ... Research Note
Research Note  |   October 01, 2016
Development and Technical Validation of the Mobile Based Assistive Listening System: A Smartphone-Based Remote Microphone
 
Author Affiliations & Notes
  • Esteban Alejandro Lopez
    PhD candidate, Interunit Program on Bioengineering, São Carlos School of Engineering, University of São Paulo, São Carlos, Brazil
  • Orozimbo Alves Costa
    Speech-Language Pathology and Audiology Department, Dental School of Bauru, University of São Paulo, Bauru, Brazil
  • Deborah Viviane Ferrari
    Speech-Language Pathology and Audiology Department, Dental School of Bauru, University of São Paulo, Bauru, Brazil
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Deborah Viviane Ferrari: deborahferrari@usp.br
  • Editor and Associate Editor: Sumitrajit Dhar
    Editor and Associate Editor: Sumitrajit Dhar×
Article Information
Hearing Disorders / Hearing Aids, Cochlear Implants & Assistive Technology / Telepractice & Computer-Based Approaches / International & Global / Special Issue: Internet and Audiology / Research Notes
Research Note   |   October 01, 2016
Development and Technical Validation of the Mobile Based Assistive Listening System: A Smartphone-Based Remote Microphone
American Journal of Audiology, October 2016, Vol. 25, 288-294. doi:10.1044/2016_AJA-16-0016
History: Received January 31, 2016 , Revised May 21, 2016 , Accepted June 3, 2016
 
American Journal of Audiology, October 2016, Vol. 25, 288-294. doi:10.1044/2016_AJA-16-0016
History: Received January 31, 2016; Revised May 21, 2016; Accepted June 3, 2016
Web of Science® Times Cited: 1

Purpose The purpose of this research note is to describe the development and technical validation of the Mobile Based Assistive Listening System (MoBALS), a free-of-charge smartphone-based remote microphone application.

Method MoBALS Version 1.0 was developed for Android (Version 2.1 or higher) and was coded with Java using Eclipse Indigo with the Android Software Development Kit. A Wi-Fi router with background traffic and 2 affordable smartphones were used for debugging and technical validation comprising, among other things, multicasting capability, data packet loss, and battery consumption.

Results MoBALS requires at least 2 smartphones connected to the same Wi-Fi router for signal transmission and reception. Subscriber identity module cards or Internet connections are not needed. MoBALS can be used alone or connected to a hearing aid or cochlear implant via direct audio input. Maximum data packet loss was 99.28%, and minimum battery life was 5 hr. Other relevant design specifications and their implementation are described.

Conclusions MoBALS performed as a remote microphone with enhanced accessibility features and avoids overhead expenses by using already-available and affordable technology. The further development and technical revalidation of MoBALS will be followed by clinical evaluation with persons with hearing impairment.

Acknowledgment
Part of this work was presented at the Second International Meeting on Internet and Audiology, Eriksholm Research Centre, Oticon A/S, Snekkersten, Denmark, September 24 to 25, 2015. Deborah V. Ferrari wants to thank the National Council for Technological and Scientific Development (CNPq), Brazil, for the scholarship “Productivity in Technological Development and Innovative Extension” (DT1).
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