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Original Article

Reference Zero for the Calibration of Audiometric Equipment using ‘Clicks’ as Test Signals

Referencia cero para la calibración de equipos audiométricos usando ‘clicks’ como señales de prueba

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Pages 478-487 | Published online: 07 Jul 2009
 

Abstract

Intended as an input to international standardisation, this study investigated reference hearing thresholds for the calibration of audiometric equipment, which have been determined using ‘clicks’ as test signals, several kinds of earphones, and two types of transducers (a loudspeaker and a bone vibrator). The threshold measurements were carried out with groups of 25 test persons with normal hearing capability following as far as possible the ISO-preferred test conditions. The influence of different parameters on the results, such as click duration, polarisation mode, repetition rate, gender and age of the test persons, or type of ear simulator, was studied. The results mainly depend on the type of ear simulator used to calibrate corresponding audiometers. Together with the results of another investigation carried out in Denmark, the data of the present study shall form the basis for the coming International Standard ISO 389-6 on reference hearing thresholds for acoustic test signals of short duration.

Acronyms
ABR=

Auditory Brainstem Responses

HATS=

Head and Torso Simulator

IEC=

International Electrotechnical Commission

ISO=

International Organisation for Standardisation

peRETSPLs=

peak-to-peak reference equivalent threshold sound pressure levels

peRETVFLs=

peak-to-peak reference equivalent threshold vibratory force levels

PTB=

Physikalisch-Technische Bundesanstalt

recom ES=

recommended ear simulator

SD=

Standard deviation

TEOAE=

Transient Evoked Otoacoustic Emissions

Acronyms
ABR=

Auditory Brainstem Responses

HATS=

Head and Torso Simulator

IEC=

International Electrotechnical Commission

ISO=

International Organisation for Standardisation

peRETSPLs=

peak-to-peak reference equivalent threshold sound pressure levels

peRETVFLs=

peak-to-peak reference equivalent threshold vibratory force levels

PTB=

Physikalisch-Technische Bundesanstalt

recom ES=

recommended ear simulator

SD=

Standard deviation

TEOAE=

Transient Evoked Otoacoustic Emissions

Sumario

Concebidos como un input para la estandarización internacional, los umbrales auditivos de referencia para la calibración de equipos audiométricos se han determinado usando “clicks” como señales de prueba y como transductores, algunos tipos de auriculares, altoparlantes o vibradores óseos. Las mediciones de umbral fueron determinadas en grupos de 25 personas con capacidad auditiva normal siguiendo tanto como fue posible las condiciones de prueba ISO-preferenciales. Se estudió la influencia de diferentes parámetros en los resultados, como la duración del click, el modo de polarización, la tasa de repetición, el género y la edad de las personas estudiadas o el tipo de simulador de oído. Los resultados dependen fundamentalmente del tipo de simulador de oído utilizado para calibrar los correspondientes audiómetros. Junto con los resultados de otra investigación que se hizo en Dinamarca, los datos de este estudio constituirán las bases del próximo International Standard ISO 389-6, en referencia a los umbrales auditivos para señales de prueba acústicas de corta duración.

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