EZLD Level-Dependent Hearing Protector Test Application

EZLD is an automated software data acquisition application for the testing of Level Dependent and Active Noise hearing protection systems and headsets in accordance with industry standards*.  EZLD generates test signals at a series of user established sound levels and then automates our Trident multi-function acoustic analyzer and National Instruments signal generation/data acquisition hardware to acquire the protected sound levels under the hearing protector.  The software and system can be used with human subjects for MIRE testing or as a fixture based testing solution.  Test results are displayed graphically within the EZLD application and can be exported into Microsoft Excel templates for post process data analysis.

BS EN352 Hearing protectors. Safety requirements and testing

ISO/TR 4869-4:1998 Acoustics — Hearing protectors — Part 4: Measurement of effective sound pressure levels for level-dependent sound-restoration ear-muffs

ISO 4869-6:2019 Acoustics — Hearing protectors — Part 6: Determination of sound attenuation of active noise reduction earmuffs

ANSI/ASA S12.42-2010 Methods For The Measurement Of Insertion Loss Of Hearing Protection Devices In Continuous Or Impulsive Noise Using Microphone-In-Real-Ear Or Acoustic Test Fixture Procedures

EZLD Level-Dependent Hearing Protector Test Application Features at a Glance:
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EZLD – Configuration

Select audio hardware devices and settings. Set global maximum values for peak voltage and SPL. Browse files and select WAV files to provide the desired test signals.


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EZLD – Sound Field Calibration

Calibrate the level of each noise source in the sound field at the reference position.


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EZLD – Test Settings

Set the parameters of how the test is performed based on the type of hearing protector. Configure criteria level, desired overshoot, timing and range of levels. Select directory and default files for exporting data.


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EZLD – DFE Level Calibration

Calculate the transfer function for the test subject’s ear relative to a reference microphone.


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EZLD – Set Levels

Check parameters given DFE correction, and rewrite them if necessary.


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EZLD – Auto Occluded

Perform test with a single click of a button!


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EZLD – Results

See data plotted as transfer functions relative to criteria level.


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EZLD – Export

Export data to Excel.


Request a Demo

Please contact VIacoustics at info@viacoustics.com for more information and an online demonstration of this product.

Please contact VIacoustics at info@viacoustics.com for information on pricing.