Assistive Listening Device Technology Flashcards

Which assistive device is specifically designed to alert a person with profound hearing loss to a doorbell ringing?

Answer: Visual alerting device

Visual alerting devices flash lights or use vibration to notify individuals with severe to profound hearing loss of environmental sounds like doorbells.

In a digital RF assistive listening system, what is the key advantage of using encrypted transmission?

Answer: Prevention of eavesdropping on private conversations

Encrypted RF transmission ensures that only authorized receivers can decode the audio signal, protecting user privacy.

Under ADA guidelines, what is the minimum percentage of fixed seating in assembly areas that must be served by an assistive listening system?

Answer: 4% (minimum 2 seats)

ADA Standards require that 4% of total fixed seats (minimum of 2) in assembly areas be served by assistive listening systems.

A patient with a cochlear implant processor equipped with a telecoil wishes to use a hearing loop. What must the audiologist verify?

Answer: That the processor's telecoil program is activated and the loop field strength is adequate

The telecoil program must be enabled on the processor, and loop field strength must meet IEC 60118-4 standards for reliable pickup.

What is the function of a silhouette inductor in an ALD system?

Answer: It inductively couples an FM receiver to a behind-the-ear hearing aid's telecoil

A silhouette inductor is a flat inductive coupler worn beside the hearing aid that transfers the FM receiver's audio signal to the hearing aid's telecoil.

Which standard defines the minimum magnetic field strength for hearing loop installations?

Answer: IEC 60118-4

IEC 60118-4 specifies that hearing loop systems should produce a minimum field strength of 100 mA/m (−20 dBrel) for reliable telecoil reception.

A patient reports their FM hearing loop receiver produces a high-pitched whistle when held near their hearing aid microphone. This is most likely caused by:

Answer: Acoustic feedback between the receiver's speaker and the hearing aid microphone

Acoustic feedback occurs when amplified sound from the receiver's speaker re-enters the hearing aid's microphone and is re-amplified in a loop.