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Listen Celebrates 20 years of Innovation

Listen Inc is proud to announce its 20th year as a leading provider of audio test and measurement systems and expertise. Two decades of innovation and steady growth have made Listen’s flagship product, SoundCheck, an industry-standard audio test system in the consumer electronics industry. The company is commemorating the occasion with updated branding – a […]

EN 50332-1 – Max. SPL of Portable Audio Devices

This sequence follows the test standard detailed in EN50332-1 (2013) for measuring the maximum sound pressure for portable music players and the earphones/headphones they are bundled with. The test involves loading a weighted pink noise stimulus file (as specified by IEC 268) onto the portable device and playing it through the earphones at the player’s […]

AGC Hearing Aid – Reference Gain & EIN Test Sequence

This sequence performs two of the measurements from the ANSI hearing aid test standard S3.22-1996.  The first part, in accordance with section 6.7 of the standard, helps the user set the reference test gain for the hearing aid, which is used for multiple measurements in the standard.  The second part, from section 6.12, tests the […]

ANSI S3.22 Hearing Aid Test Sequences

These sequences include all the tests from ANSI S3.22:2014 as well as some of the additional ‘Annex C’ tests from the 2014 ANSI standard. This guide describes the basic functionality of each sequence and details the process of hardware setup and calibration. Each test, as outlined in the standards, is contained in a single test […]

Measuring Digital MEMS Microphones: Frequency, Sensitivity and Power Supply Rejection (PSR) Performance

This test suite contains 3 sequences to enable comprehensive testing of digital MEMS microphones. The first measures the frequency and sensitivity and displays two graphs: absolute level in dBFS, and the same response curve but normalized to 0 dB at 1 kHz. The second sequence uses the substitution method to test a digital MEMS microphone […]

Microphone Polar Plot Sequence

This sequence measures the directional response of a microphone and graphs the result as a polar plot. A log sweep stimulus is played from 100 Hz to 10 kHz at each angular increment, and the acquired waveform is analyzed using the Time Selective Response algorithm. This method allows the test to be performed in a […]