audiometric zero

the level of a pure tone of a given frequency that is just detectable by a person with normal hearing. For example, the audiometric zero for a 1 kHz pure tone is 7.5 dB SPL (decibels sound-pressure level) for TDH49 headphones, according to U.S. standards (ANSI S3.6-1996 Specification for Audiometers). Audiometric zero is used to calibrate audiometers and, by definition, is 0 dB HL (hearing level). See audiogram.

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Psychology term of the day

November 22nd 2024

population variance

(symbol: σ²) the square of the population standard deviation. It is a measure reflecting the spread (dispersion) of scores in a complete population of interest (e.g., the test scores of all students at a school).