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Technical Note

Insert earphones–a comparison of short-duration signals measured with an occluded ear simulator and a 2cc coupler

Audífonos de inserción–una comparación de señales de corta duración medidas con un oído artificial ocluido y un acoplador de 2cc

Pages 60-65 | Received 25 Feb 2005, Published online: 07 Jul 2009
 

Abstract

The responses of several insert earphones in the Etymotic 3A series were measured with the occluded ear simulator (IEC 60711) and the 2cc coupler (IEC 60126). Acoustic clicks following a 100 µs rectangular voltage pulse were compared. The peak-to-peak equivalent sound pressure levels in the ear simulator were found to be 9.2 dB greater than those in the 2cc coupler. The difference was independent of type of earphone among those tested. Similar comparisons were made for tone pips (brief tones or tone bursts) and continuous tones. For a given drive voltage, differences in earphone output were almost the same as the corresponding differences in published RETSPLs for the occluded ear simulator and 2cc coupler (ISO 389-2).

Sumario

Se midieron las respuestas de varios audífonos de inserción de la serie Etymotic 3A con el oído artificial ocluido y el acoplador de 2cc (IEC 60126). Se compararon los clics acústicos después de un pulso rectangular de voltaje de 100 µs. Se encontró que los niveles de presión sonora equivalentes de pico a pico en el oído artificial fueron 9.2 dB mayores que aquellos en el acoplador de 2cc. La diferencia fue independiente del tipo de audífono probado. Una comparación similar se hizo con tonos pip (tonos breves/tonos burst) y tonos continuos. Las diferencias para un de voltaje corriente en la salida de los audífonos, fueron casi iguales que las diferencias correspondientes publicadas en RETSPLs para el oído artificial ocluido y el acoplador de 2cc (ISO 389-2)

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