Hearing aid fitting, real-ear measurement, and verification concepts for hearing aid specialists.
32 cards · basic cards · AI-written, checked twice. Edit anything.
- What is real-ear measurement (REM)?
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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?
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Approximately 5 mm from the tympanum, measured along the ear canal.- What does REAR stand for?
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Real-Ear Aided Response, the SPL measured in the ear canal with the hearing aid inserted and functioning.- What does REUR stand for?
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Real-Ear Unaided Response, the SPL measured in the ear canal without a hearing aid.- What is insertion gain?
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The difference between the real-ear aided response (REAR) and the real-ear unaided response (REUR).- Name one common hearing aid fitting formula.
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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?
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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?
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ANSI S3.19 defines test procedures and measurements for hearing aid performance.- What causes acoustic feedback in hearing aids?
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Amplified sound from the receiver leaks back to the microphone, creating a whistle or squeal.- Name one method to control acoustic feedback.
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Feedback cancellation (adaptive algorithm), improved ear mold seal, or reduced gain.- What is compression in a hearing aid?
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An automatic gain control feature that reduces gain for loud sounds, protecting against loudness discomfort.- What does frequency response describe in a hearing aid?
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How the hearing aid amplifies sound across different frequencies (Hz), typically displayed as a graph.- What is included in hearing aid orientation?
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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?
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It picks up magnetic signals from telephone handsets and telecoil-compatible devices, bypassing the microphone.- What is the main benefit of a directional microphone?
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It preferentially amplifies sound from the front and reduces background noise from the sides and rear.
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