Cover Image
QR Code

A study of low-cost, robust assistive listening system (ALS) based on digital wireless technology.

PURPOSE: We have developed a simple, low-cost digital wireless broadcasting system prototype, intended for a classroom of hearing impaired students. The system is designed to be a low-cost alternative to an existing FM system. METHOD: The system implemented is for short-range communication, with a o...

Full description

Published in:Disability & Rehabilitation: Assistive Technology Vol. 3; no. 6; pp. 295 - 302
Main Authors: Israsena P, Dubsok P, Pan-Ngum S
Format: research tables/charts Journal Article
Published: Taylor & Francis Ltd Nov2008
Online Access:View this record in EBSCOhost
fields @attributes:
  recordID: 1
pdfLink:
plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105638071&site=ehost-live
header:
  @attributes:
    shortDbName: ccm
    uiTerm: 105638071
    longDbName: CINAHL Complete
    uiTag: AN
  controlInfo:
    bkinfo:
    dissinfo:
    jinfo:
      jid:
        17483107
        1X04
      jtl: Disability & Rehabilitation: Assistive Technology
      issn: 17483107
      maglogo: Y
    pubinfo:
      dt: Nov2008
      vid: 3
      iid: 6
      pid: 377
      pub: Taylor & Francis Ltd
      place: Philadelphia, Pennsylvania
    artinfo:
      ui:
        105638071
        105638071
        2010178776
        10.1080/17483100802323392
        NLM19117189
        105638071
      ppf: 295
      ppct: 7
      formats:
        fmt:
          @attributes:
            type: P
      tig:
        atl: A study of low-cost, robust assistive listening system (ALS) based on digital wireless technology.
      aug:
        au:
          Israsena P
          Dubsok P
          Pan-Ngum S
        affil: National Electronics and Computer Technology Center, Pathumthani, Thailand. pasin.israsena@nectec.or.th
      sug:
        subj:
          Alternative and Augmentative Communication
          Equipment Design
          Equipment Reliability
          Hearing Disorders
          Students with Disabilities
          Teaching Methods
          Communication Evaluation
          Descriptive Statistics
          Evaluation Research
          Rehabilitation of Persons with Hearing Loss
          School Health Services
          Human
      ab: PURPOSE: We have developed a simple, low-cost digital wireless broadcasting system prototype, intended for a classroom of hearing impaired students. The system is designed to be a low-cost alternative to an existing FM system. METHOD: The system implemented is for short-range communication, with a one-transmitter, multiple-receiver configuration, which is typical for these classrooms. The data is source-coded for voice-band quality, FSK modulated, and broadcasted via a 915 MHz radio frequency. A DES encryption can optionally be added for better information security. RESULTS: Test results show that the system operating range is approximately ten metres, and the sound quality is close to telephone quality as intended. We also discuss performance issues such as sound, power and size, as well as transmission protocols. CONCLUSIONS: The test results are the proof of concept that the prototype is a viable alternative to an existing FM system. Improvements can be made to the system's sound quality via techniques such as channel coding, which is also discussed.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
    refInfo:
    holdings:
      @attributes:
        islocal: N