IHS Aid Technology 2 — Questions and Answers
Question 1: Which hearing aid feature uses a microphone array to improve speech understanding in noisy environments?
- Telecoil coupling
- Directional microphone technology (Correct answer)
- Frequency lowering
- Analog compression
Correct answer: Directional microphone technology
Directional microphone technology uses two or more microphones to focus on sounds coming from in front of the listener while reducing noise from other directions.
Question 2: What does the term 'open fit' refer to in hearing aid technology?
- A hearing aid with no battery door
- A fitting style where the ear canal is not fully occluded (Correct answer)
- A hearing aid programmed without a target
- An aid with an open-back receiver housing
Correct answer: A fitting style where the ear canal is not fully occluded
Open fit hearing aids use a thin tube or receiver wire with a small dome that leaves the ear canal largely unoccluded, reducing the occlusion effect.
Question 3: A receiver-in-canal (RIC) hearing aid differs from a traditional BTE primarily in that:
- It uses analog signal processing
- The receiver is placed in the ear canal rather than in the housing (Correct answer)
- It requires no ear mold
- It only amplifies high frequencies
Correct answer: The receiver is placed in the ear canal rather than in the housing
In RIC aids, the receiver (speaker) is moved from the BTE housing into the ear canal, connected by a thin electrical wire, reducing size and improving sound quality.
Question 4: Which wireless standard is most commonly used for direct audio streaming between modern hearing aids and smartphones?
- Wi-Fi 802.11n
- Near Field Communication (NFC)
- Bluetooth Low Energy (BLE) (Correct answer)
- FM radio transmission
Correct answer: Bluetooth Low Energy (BLE)
Bluetooth Low Energy (BLE) is used in modern Made for iPhone and ASHA (Audio Streaming for Hearing Aids) platforms for direct, low-power audio streaming.
Question 5: What is the primary purpose of a hearing aid vent?
- To increase amplification in the high frequencies
- To allow low-frequency sound to escape and reduce the occlusion effect (Correct answer)
- To provide a pathway for moisture to drain
- To house the telecoil antenna
Correct answer: To allow low-frequency sound to escape and reduce the occlusion effect
Vents allow low-frequency sound energy and the patient's own voice to escape the ear canal, reducing the plugged or hollow sensation known as the occlusion effect.
Question 6: Digital feedback suppression (DFS) systems in hearing aids work by:
- Blocking all microphone input above 4000 Hz
- Detecting and canceling the feedback signal before it becomes audible (Correct answer)
- Reducing overall gain across all frequencies
- Switching the aid to telecoil mode automatically
Correct answer: Detecting and canceling the feedback signal before it becomes audible
DFS algorithms continuously monitor the output signal, identify feedback paths, and apply an out-of-phase cancellation signal to eliminate whistling before it is perceived.
Question 7: An IIC (Invisible-in-Canal) hearing aid is best suited for patients with:
- Severe to profound hearing loss requiring maximum gain
- Mild to moderate hearing loss and adequate ear canal size (Correct answer)
- Single-sided deafness requiring CROS amplification
- Conductive hearing loss requiring bone conduction
Correct answer: Mild to moderate hearing loss and adequate ear canal size
IIC aids sit deep in the second bend of the ear canal and are appropriate for mild to moderate losses; they cannot accommodate the larger receivers needed for severe-to-profound loss.
IHS Aid Technology 2
Which hearing aid feature uses a microphone array to improve speech understanding in noisy environments?