A modern digital hearing aid automatically delivers greater amplification for soft inputs and progressively less amplification as input level increases, keeping output within the patient's narrowed dynamic range. This operating principle is called:

• A Peak clipping with linear amplification
• B Wide dynamic range compression (WDRC) ✓
• C Output limiting via compression limiting only at high levels
• D Frequency transposition

Explanation

Wide dynamic range compression continuously adjusts gain across the entire input range: soft sounds receive maximum gain, loud sounds receive least, compressing the wide environmental range into the reduced dynamic range typical of cochlear hearing loss with recruitment. Linear peak clipping preserves gain ratios until output saturates and introduces distortion, whereas output compression limiting acts only above high thresholds and does not reshape the whole input-output function. Frequency transposition shifts inaudible high frequencies downward and does not describe gain behavior.

Reference: Cummings Otolaryngology: Head and Neck Surgery, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.