IEC 60318 4 PDF

Abstract IEC describes an occluded-ear simulator intended for the measurement of insert earphones in the frequency range from Hz to 10 Hz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e. The occluded-ear simulator is also suitable as the basis for an extension intended to simulate the complete ear canal and the outer ear for instance in head simulators. The occluded-ear simulator simulates the acoustic transfer impedance for the occluded normal adult human ear. However, it does not simulate the leakage between an earmould and a human ear canal; therefore, the results obtained with the occluded-ear simulator may deviate from the performance of an insert earphone on a real ear, especially at low frequencies.

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Give feedback IEC describes an occluded-ear simulator intended for the measurement of insert earphones in the frequency range from Hz to 10 Hz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e. The occluded-ear simulator is also suitable as the basis for an extension intended to simulate the complete ear canal and the outer ear for instance in head simulators.

The occluded-ear simulator simulates the acoustic transfer impedance for the occluded normal adult human ear. However, it does not simulate the leakage between an earmould and a human ear canal; therefore, the results obtained with the occluded-ear simulator may deviate from the performance of an insert earphone on a real ear, especially at low frequencies. Moreover, large performance variations among individual ears will occur which should be considered when using the ear simulator.

Above 10 kHz the device does not simulate a human ear, but can be used as an acoustic coupler at additional frequencies up to 16 kHz. Below Hz, the device has not been verified to simulate a human ear, but can be used as an acoustic coupler at additional frequencies down to 20 Hz.

IEC cancels and replaces IEC , published in and constitutes a technical revision. The main changes with respect to the previous edition are listed below: - extension of the usable frequency range to Hz - 16 Hz; - addition of values of maximum permitted expanded uncertainties to all tolerances.

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Most recent IEC Ed. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e. The occluded-ear simulator is also suitable as the basis for an extension intended to simulate the complete ear canal and the outer ear for instance in head simulators. The occluded-ear simulator simulates the acoustic transfer impedance for the occluded normal adult human ear.

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Give feedback IEC describes an occluded-ear simulator intended for the measurement of insert earphones in the frequency range from Hz to 10 Hz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e. The occluded-ear simulator is also suitable as the basis for an extension intended to simulate the complete ear canal and the outer ear for instance in head simulators. The occluded-ear simulator simulates the acoustic transfer impedance for the occluded normal adult human ear. However, it does not simulate the leakage between an earmould and a human ear canal; therefore, the results obtained with the occluded-ear simulator may deviate from the performance of an insert earphone on a real ear, especially at low frequencies. Moreover, large performance variations among individual ears will occur which should be considered when using the ear simulator. Above 10 kHz the device does not simulate a human ear, but can be used as an acoustic coupler at additional frequencies up to 16 kHz.

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