Topic 10

definitions

100

hearing assistive technology

any device that helps people with hearing loss detect sounds or understand speech, but which are not worn totally on the head

200

hearing assistive technology system

user, device, environment

not medical devices

300

induction loop

a sound source goes through an amplifier to a thin loop of wire that encircles a room or branches out beneath carpeting, to a receiver worn in the ears or as a headset

400

infrared system

The input can be from a microphone, sound system, or other audio source. they produce an electrical signal which is fed to the modulator which prepares the audio signal for the subsequent infrared transmission. The processed signal is fed to the radiator, and the radiator diodes produce the invisible infrared light and radiate it to the room. Wireless receivers are used to convert the light signal back into the electrical signal and then into an audio signal again.

500

FM system 

FM system can be coupled to an unaided ear or CIC HA worn with headphones and body worn FM receiver

can be coupled via ITE or BTE HA set to telecoil mode and worn with neckloop and body worn FM receiver

ITE or BTE HA set to telecoil and worn with silhouette inductor and body worn receiver

BTE HA with DAI cord and body worn receiver

fire safety

100

fire represents what # most common accidental cause of death

fourth

200

how many americans die annually from residential fires

3000

300

most victims of fire deaths are

children and elderly

400

most fatalities in fires occur between what times

11 pm and 7 am

500

what percentage of homes had working smoke detectors when someone dies

40%

fire safety

100

smoke detectors have what

limitations

200

standard warning signal frequency range

3000-4000 Hz

300

what proportion of adults with hearing loss wouldn't wake up to fire signals and why?

almost half b/c high frequency HL 

400

best type of signal for waking adults with hearing loss up

525 Hz square wave

500

what needs to be added to a signal to wake up adults with hearing loss

a bed shaker

fire safety& HAT

100

describe properties for warning sounds

1. three successive 1/2 second ON phases followed by a 1/2 second OFF time as represented by the block horizontal lines appearing after each ON phase

200

warning sounds should be what decibel level, what weighting scale, and what distance

85 dB A at 10 feet away

300

how many decibels louder should the signal be

40 dB

400

what should the clinical report include of HAT fittings?

rationale for system selection, counseling provided, procedures involved in assessment of system, measures of satisfaction, prognosis for benefit, planning for monitoring/orientation, final disposition/assessment plan

500

what should the pt be able to do after the fitting (lots of things)

explain what the device is

explain purpose of device

explain how speakers use it

list situations for device

troubleshoot

install

turn on/off

change batteries

clean and care

select coupling methods appropriate

describe principles of sound source microphone proximity

explain presence of device

HAT and systems

100

FM advantages

used inside and outside, mobile, broadcast to unlimited amount of receivers, ensure transmission of clear, high quality signal, access easy through built in receivers in HA

200

infrared system advantages

transmits high quality signal, doesn't limit seating as long as direct line of site path, privacy is assured

300

induction loop advantages

accessible to listeners with telecoil HA/CI

freedom of movement within loop 

relatively low expense 

400

classifying HAT

with HA or without/instead of HA 

by communication need: face to face, electronic media, phone, or environmental awareness

by situation: in home, in community, in school environment

500

what technology makes connectivity seamless

bluetooth