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Pure-tone audiometry is the main hearing test used to identify hearing threshold levels of an individual, enabling determination of the degree, type and configuration of a hearing loss [1] [2] and thus providing a basis for diagnosis and management.
The standard and most common type of hearing test is pure tone audiometry, which measures the air and bone conduction thresholds for each ear in a set of 8 standard frequencies from 250Hz to 8000Hz. The test is conducted in a sound booth using either a pair of foam inserts or supraural headphones connected to an external audiometer.
TFS1: this test assesses the ability to discriminate between a harmonic complex tone and its frequency-transposed (and thus, inharmonic) version. [ 244 ] [ 245 ] [ 246 ] [ 159 ] Binaural pitch: these tests evaluate the ability to detect and discriminate binaural pitch, and melody recognition using different types of binaural pitch.
The stimulus level is varied continuously via a dial and the stimulus level is measured by the tester at the end. The threshold is the mean of the just audible and just inaudible levels. Also this method can produce several biases. To avoid giving cues about the actual stimulus level, the dial must be unlabeled.
For example, the yin ping tone is a high level tone in Beijing Mandarin Chinese but a low level tone in Tianjin Mandarin Chinese. More iconic systems use tone numbers or an equivalent set of graphic pictograms known as "Chao tone letters". These divide the pitch into five levels, with the lowest being assigned the value 1 and the highest the ...
Standards using different reference levels, give rise to differences in audiograms. The ASA-1951 standard, for example, used a level of 16.5 dB SPL (sound pressure level) at 1 kHz, whereas the later ANSI-1969/ISO-1963 standard uses 6.5 dB SPL, with a 10 dB correction applied for older people.
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A pure tone audiometry hearing test is the gold standard for evaluation of hearing loss or disability. [medical citation needed] Other types of hearing tests also generate graphs or tables of results that may be loosely called 'audiograms', but the term is universally used to refer to the result of a pure tone audiometry hearing test.