Predicting hearing aid response in real ears

Sanborn, Per-Eric

doi:10.1121/1.423082

Cited by 11 publications

(10 citation statements)

References 11 publications

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“…The SPL developed in a coupler or an ear canal is dependent on the impedance of the coupler or ear canal, the impedance of the coupling system, and the impedance of the sound source (Egolf, Feth, Copper, & Franks, 1985;Gilman, Dirks, & Stern, 1981;Sanborn, 1998). Because the RECD is the difference in SPL developed in the ear canal and the SPL developed in the coupler, it will also be dependent on these factors.…”

Section: Discussionmentioning

confidence: 97%

The Influence of RECD Transducer When Deriving Real-Ear Sound Pressure Level

Munro

Millward

2006

Ear &Amp; Hearing

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The accuracy of the derived real-ear response obtained using an RECD, measured with an ER-3A insert earphone, is very good when an HA1 is used for the coupler component of the RECD. The accuracy diminishes somewhat with the HA2 coupler, especially for undamped hearing instruments. The accuracy of the derived real-ear response is very good when the RECD is measured using the hearing instrument and the HA1 or the HA2 coupler.

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Section: Discussionmentioning

confidence: 97%

The Influence of RECD Transducer When Deriving Real-Ear Sound Pressure Level

Munro

Millward

2006

Ear &Amp; Hearing

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“…More generally, hearing aid software may not adequately adjust the hearing aid to achieve a target if the average REUG, microphone location effect, and vent and tubing effects incorporated in the hearing aid software are different from the individual values (Dillon and Keidser, 2003). Unusual shapes or sizes of ear canals may result in especially large discrepancies between the target and measured REIG values (Sanborn, 1998).…”

Section: DI Is Sc Cu Us Ss Si Io On Nmentioning

confidence: 99%

The Value of Routine Real Ear Measurement of the Gain of Digital Hearing Aids

Aazh¹,

Moore²

2007

J Am Acad Audiol

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The main aims of this study were: (1) to determine whether routine real ear insertion gain (REIG) measurement is necessary in fitting digital hearing aids; and (2) to assess the extent to which modifying the frequency-gain response of an aid can lead to better matches to the target in cases where the target gain was not initially achieved. The target formula was selected as NAL-NL1 in the programming software of four types of digital hearing aids. REIG measurements on 42 ears showed that 64% of cases failed to come within +/-10 dB of the target at one or more of the following frequencies: 0.25, 0.5, 0.75, 1, 1.5, 2, and 4 kHz. After adjusting the frequency-gain response of the aids, based on the REIG results, 83% of cases came within +/-10 dB of the target. The target was met more often, both before and after adjustment, for aids with seven gain "handles" than for aids with four gain "handles". The results indicate that REIG measurements can and should be used to achieve more accurate fittings but that accurate adjustments are difficult with some aids.

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“…Several numerical models of the IEC 60318-4 simulator based on the finite element (FE) or boundary element method have been proposed to better account for the thermo-viscous phenomena involved in the system [7,8,10,11]. But most of the existing simulator numerical models [10,11] were validated against experimental impedance data taken from international standards [5,6] which were obtained using simultaneously an insert earphone and a probe microphone fixed in the human ear canal (e.g., [4,12,13,14]). They suffer from the lack of experimental validation of the models using the corresponding ear simulators.…”

mentioning

confidence: 99%

A Transfer Matrix Model of the IEC 60318-4 Ear Simulator: Application to the Simulation of Earplug Insertion Loss

Luan¹,

Sgard²,

Benacchio³

et al. 2019

Acta Acustica united with Acustica

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The IEC 60318-4 ear simulator is used to measure the insertion loss (IL) of earplugs in the ear canal of an acoustical test fixture (ATF) and is designed to represent an average acoustic impedance (in a reference plane) of the human ear. The ear simulator is usually modeled using a lumped parameter model (LPM) which has frequency limitations and inadequately accounts for the thermo-viscous effects in the simulator. The simulator numerical models that can better deal with the thermo-viscous phenomena often lack essential geometric details. Most related studies also suffer from the lack of experimental validation of the models. Therefore, a transfer matrix (TM) model of the IEC 60318-4 simulator is proposed based on a direct assessment of its geometric dimensions. Such a model is of particular interest for designing artificial ear simulators. The variability in the simulator impedance due to the geometric uncertainties is quantified using the Monte Carlo method. The TM model is validated using i) a finite element (FE) model of the simulator and ii) impedance measurements with a sound intensity probe. It is found to better describe the simulator impedance above 3 kHz compared to the LPM. The TM model is then coupled to a FE model of an occluded ATF ear canal to simulate the IL of an earplug in the frequency range [100 Hz, 10 kHz]. In the model, the simulator is considered as a cylindrical cavity terminated by an equivalent tympanic impedance which is determined from the TM model to simulate the sound pressure measured at the real microphone position (not at the reference plane) in the ATF ear canal. The simulated IL is validated against i) that obtained with a complete FE model of the corresponding system and ii) measurements using an ATF. The TM model is shown to better agree with the simulator FE model than the LPM above 6 kHz regarding the earplug IL simulated using this method.

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Predicting hearing aid response in real ears

Cited by 11 publications

References 11 publications

The Influence of RECD Transducer When Deriving Real-Ear Sound Pressure Level

The Influence of RECD Transducer When Deriving Real-Ear Sound Pressure Level

The Value of Routine Real Ear Measurement of the Gain of Digital Hearing Aids

A Transfer Matrix Model of the IEC 60318-4 Ear Simulator: Application to the Simulation of Earplug Insertion Loss

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