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Issues in Classroom Acoustics

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Issues in Classroom Acoustics. Adequacy of the Communication Environment and ' ... Intervention Strategies Require Optimal Classroom Acoustics to Be Effective ... – PowerPoint PPT presentation

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Title: Issues in Classroom Acoustics


1
Issues in Classroom Acoustics
  • Adequacy of the Communication Environment and
    Teaching in the Dark
  • John Erdreich, PhD, FASA and
  • R. Kring Herbert, FASA, INCE Board Certified.
  • Ostergaard Acoustical Associates

2
Why the Concern?
  • Aspects of energy efficient design
  • Addition of noisy computer equipment
  • Recognition of needs of population with
    disabilities
  • New testing including verbal abilities

3
Plan of the Workshop
  • Provide the scientific validation of the concern
  • How acoustical engineers evaluate a space
  • How to select criteria
  • How to achieve criteria
  • Activities re ADA
  • Incorporating acoustics in to the design process
  • Specialized spaces

4
Two Perspectives
  • Occupational work environment
  • Noise exposure
  • Vocal pathology
  • Classroom communication
  • Speech intelligibility
  • Language acquisition
  • Effect of hearing impairment in children

5
Standards for Classroom Ambient Conditions
  • Light
  • Temperature
  • Air changes
  • Humidity

6
Areas for Acoustical Control
  • Room finishes
  • Activity sound
  • Ventilation noise
  • Sound intrusion from other rooms

7
Rationale for Acoustical Control
  • Language development
  • Communication by hearing impaired children
  • Prevalence of hearing impairment in the school
    population

8
Relationship Between Hearingand Learning
  • Hearing impairment in school-age children
  • Differences in speech perception with hearing
    impairment

9
Normal Vs. Impaired Hearingin Children
  • Normal 15 dB HL 500, 1000, 2000, 4000 Hz
  • Auditory disorders
  • Conductive
  • Sensorineural
  • Mixed
  • Central

10
Impaired Speech Perception in Non-optimal
Listening Conditions
  • Non-native English speakers
  • Language deficits
  • Attention deficit disorder
  • Minimal SNHL
  • Bilateral SNHL
  • Conductive hearing loss associated with OME
  • Normal hearing with history of OME
  • Unilateral hearing impairment
  • Learning disabled

11
Intervention Strategies Require Optimal Classroom
Acoustics to Be Effective
  • Audiometric screening
  • Preferential seating
  • Personal hearing aids
  • FM systems
  • Soundfield FM systems

12
Comparison of Word Recognition NORMAL vs SNHL
13
Improvement in Recognition With Age
14
Sentence Recognition Performance With Age
15
Comparison of Noisy vs. Quiet Ventilator
  • Quiet NC 30
  • Noisy NC 50
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