Jurisdiction(s):
United Kingdom

Key definition

Noise definition

What does Noise mean? In transactional, finance and insurance practice, noise describes uncertainty or variability in outcomes that is not driven by investment market movements. It is a descriptive expression rather than a defined legal term in the UK or Ireland. Examples include an insurer’s uncertainty over the frequency, timing and severity of future claims on its book, or short-term, immaterial fluctuations in working capital or earnings unrelated to market prices. Lawyers refer to noise when allocating non-market risk in contracts, for example in pricing mechanisms, earn-out or working capital true-ups, financial covenants, material adverse change clauses, warranties and indemnities, and in regulatory...

Noise-induced hearing loss: medico-legal audiology glossary for occupational and personal injury claims

Published by a LexisNexis PI & Clinical Negligence expert

Practice notes

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Air conduction (AC)

Sound is carried through the outer and middle ear before reaching the inner ear. A standard audiogram evaluates hearing via air conduction.

Age-associated hearing loss (AAHL)

Also termed presbycusis, this age-related hearing loss arises chiefly from ageing and usually impacts both ears to an equal extent.

Air-bone gap (ABG)

The value obtained by subtracting the HTL from the bone conduction reading from the HTL of the air conduction reading.

Audiogram

A pure tone audiogram is a graph of an individual’s hearing threshold levels for pure tones across different frequencies, displaying loss as a function of frequency, measured with an audiometer.

Audiometer

Pure tone audiometer — an electroacoustic instrument. For air conduction tests it uses a headset with two earphones delivering pure tones of specified frequencies at known sound pressure levels to establish hearing thresholds, one ear at a time. For bone conduction measurement the audiometer also includes a bone vibrator.
Manual audiometer — an audiometer in which signal presentation, choice of frequency and hearing level, and noting the subject’s responses are all performed manually...

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Sue Brown

Susan Brown qualified as a solicitor in 1996, and was a partner and Head of Personal Injury at niche West End litigation firm Reid Minty until 2003, when she moved to the in-house legal team for Royal&SunAlliance. She was with Prolegal from 2007 to June 2016 as Head of Personal Injury and Professional Negligence. She is now a mediator and a director of Claims Portal and Medco.Sue has specialised in personal injury, clinical negligence and professional negligence claims for over 20 years and has a particular interest in asbestos disease claims and in complex psychiatric injury claims. She has handled a wide range of professional negligence claims including against solicitors, surveyors, architects and accountants.Sue talks and makes regular published contributions in the legal and national press on issues of personal injury, professional negligence, costs and funding.Sue was Chair of the Motor...

Web page updated on 21/05/2026

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