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The DOD defines a significant threshold shift as a 10 dB average decrease in hearing thresholds at 2000, 3000, and 4000 Hz in either ear, with no age corrections. It is further specified that a shift in 15 dB at 1000, 2000, 3000, or 4000 Hz is an early warning sign for an STS; follow-up retraining is required in this case.
The current International Organization for Standardization (ISO) standard for pure-tone audiometry is ISO:8253-1, which was first published in 1983. [7] The current American National Standards Institute (ANSI) standard for pure-tone audiometry is ANSI/ASA S3.21-2004, prepared by the Acoustical Society of America.
Audiogram. An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). [1]
The absolute threshold of hearing (ATH), also known as the absolute hearing threshold or auditory threshold, is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organism.
Standard Form 86 - Questionnaire for National Security: Image title: Questionnaire for National Security: Author: OPM: Software used: Adobe LiveCycle Designer 11.0: Conversion program: Adobe LiveCycle Designer 11.0: Encrypted: no: Page size: 612 x 792 pts (letter) Version of PDF format: 1.7
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The discomfort threshold is the loudness level from which a sound starts to be felt as too loud and thus painful by an individual. Industry workers tend to have a higher discomfort threshold (i.e. the sounds must be louder to feel painful than for non-industry workers), but the sound is just as harmful to their ears. [33]