Instrument Selection Flashcards

What does the acronym WDRC refer to in hearing instrument signal processing?

Answer: Wide Dynamic Range Compression

WDRC (Wide Dynamic Range Compression) amplifies soft sounds more than loud sounds to restore the compressed dynamic range typical of sensorineural hearing loss.

A patient understands speech well in quiet but struggles in restaurants. Which technology feature should be PRIORITIZED during instrument selection?

Answer: Directional microphone system with digital noise reduction

Directional microphones and noise reduction algorithms specifically target improving the speech-to-noise ratio in environments like restaurants.

Which compression parameter determines how quickly a hearing aid responds to a sudden loud sound?

Answer: Attack time

Attack time is the speed at which the compressor engages to reduce gain when the input signal exceeds the compression threshold.

A patient with bothersome tinnitus is being fitted with hearing aids. Which technology feature may provide additional relief beyond standard amplification?

Answer: Built-in tinnitus sound therapy programs

Many modern hearing aids include dedicated tinnitus therapy programs that generate masking or soothing sounds to reduce tinnitus perception.

What is the PRIMARY purpose of a feedback cancellation algorithm in a digital hearing aid?

Answer: Detect and suppress acoustic feedback whistling before it becomes audible

Feedback cancellation continuously monitors for feedback and applies an inverse signal to cancel the whistle before the patient or listener hears it.

Frequency lowering technology is MOST beneficial for patients with which audiometric profile?

Answer: Severe-to-profound high-frequency hearing loss with poor audibility above 2000 Hz

Frequency lowering shifts high-frequency speech cues (such as /s/ and /sh/) to lower frequencies where residual hearing exists, improving consonant audibility.

A hearing instrument with multiple memory programs is MOST useful for which type of patient?

Answer: A patient who regularly moves between quiet, noisy, music, and telephone listening situations

Multiple memories allow optimized settings for distinct acoustic environments, enabling the patient or automatic switching to match the current listening situation.