classroom acoustics Flashcards
what percentage of US children have hearing loss that can potentially impact their educational progress
14% w/ permanent or temporary loss affecting education
what is the difference between audibility and intelligibility
audibility is if the person can hear you
intelligibility is if the person can understand what you are saying
what is distance hearing
how far can I be away from you so you can understand me
what factors would create an unfavorable acoustic environment
reverberance
distance (inverse square law)
noise
what is signal to noise ratio?
speech noise compared to background noise
SNR for hearing impaired
20 dB
SNR for normal hearing
15 dB
what is reverberation
prolongation in sound in an environment after the original sound has ceased
how does reverberation affect speech understanding
speech distortion
reduced intelligibility
increased listening efforts
what is a soundfield distribution system
used to evenly distribute sound throughout a room
consists of microphone, amplifier and loud speakers
what populations would most benefit from a sound field distribution system
kids w/ hearing loss
older people = slower processing
non native speakers = slower processing
teachers - amplifies voice
difference between a sound field and a personal fm system
fm: right to receiver which is attached to student
s: classroom benefits, away from people
the ANSI S12.6-2002 published a national standard which defines acceptable noise levels in the classroom to be no higher than __ dB and reverberation levels of no more than ___ seconds
35 dB
.6 seconds
