Hearing aid fitting, real-ear measurement, and verification concepts for hearing aid specialists.
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- What is real-ear measurement (REM)?
- Measuring hearing aid performance directly in the patient's ear canal using a probe tube microphone.
- Where is the probe tube microphone positioned during real-ear measurement?
- Approximately 5 mm from the tympanum, measured along the ear canal.
- What does REAR stand for?
- Real-Ear Aided Response, the SPL measured in the ear canal with the hearing aid inserted and functioning.
- What does REUR stand for?
- Real-Ear Unaided Response, the SPL measured in the ear canal without a hearing aid.
- What is insertion gain?
- The difference between the real-ear aided response (REAR) and the real-ear unaided response (REUR).
- Name one common hearing aid fitting formula.
- DSL (Desired Sensation Level) or NAL-NL2 (National Acoustic Laboratories Non-Linear 2).
- What is the purpose of a coupler measurement in hearing aid testing?
- To measure hearing aid performance in a standardized 2cc acoustic cavity, allowing consistent comparison across devices.
- Which ANSI standard applies to hearing aid acoustic measurements?
- ANSI S3.19 defines test procedures and measurements for hearing aid performance.
- What causes acoustic feedback in hearing aids?
- Amplified sound from the receiver leaks back to the microphone, creating a whistle or squeal.
- Name one method to control acoustic feedback.
- Feedback cancellation (adaptive algorithm), improved ear mold seal, or reduced gain.
- What is compression in a hearing aid?
- An automatic gain control feature that reduces gain for loud sounds, protecting against loudness discomfort.
- What does frequency response describe in a hearing aid?
- How the hearing aid amplifies sound across different frequencies (Hz), typically displayed as a graph.
- What is included in hearing aid orientation?
- Instruction on insertion, removal, battery use, cleaning, expected listening experience, and use of controls.
- What is the function of a telecoil (T-coil) in a hearing aid?
- It picks up magnetic signals from telephone handsets and telecoil-compatible devices, bypassing the microphone.
- What is the main benefit of a directional microphone?
- It preferentially amplifies sound from the front and reduces background noise from the sides and rear.