Kneepoint
Pronunciation: nee-point
The input sound level at which a hearing aid's amplifier transitions from linear to compression amplification.
Full Definition
The kneepoint, also called the compression threshold or compression kneepoint, is the input level (in dB SPL) at which a hearing aid's compression circuit engages. Below the kneepoint, the device applies linear gain; above it, compression reduces the gain incrementally according to the compression ratio. Correct kneepoint setting is critical to aural rehabilitation outcomes because an inappropriately low kneepoint can cause soft sounds to be compressed unnecessarily, while a high kneepoint may fail to protect the listener from loud sounds. In fitting documentation, editors should verify that the kneepoint is expressed in dB SPL and that it is associated with the correct frequency channel.
Usage
Usage note: Both 'kneepoint' (one word) and 'knee point' (two words) appear in the literature; follow house style and apply consistently. Always state the associated dB SPL value.
In Context
- "The kneepoint was set at 45 dB SPL to ensure that soft conversational speech received full linear amplification." — Hearing aid fitting report
- "The editor standardized 'knee-point', 'kneepoint', and 'TK' to a single form throughout the clinical protocol document." — Editorial style note