How to measure Ganymede MEMS microspeakers

April 30, 2019

USound specifies and measures Ganymede MEMS speakers, Achelous and Adap, in both acoustic domains: in the baffle and the coupler (artificial ear). For both setups, proprietary measurement adapters are used to fit the standardised setup. In Baffle To measure in a baffle, the measurement adapter places the MEMS speaker with appropriate sealing inside the IEC baffle. The…

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MEMS speaker

How do USound MEMS speakers work?

April 4, 2019

USound’s technology is based on piezoelectricity. Crystals with these properties are for example aluminium nitride (AlN) or lead zirconate titanate (PZT). These materials expand or shrink in an electric field. In a practical configuration, such an electric field is generated between electrodes, covering a piezoelectric layer. This stack is put on top of a substrate…

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Cloud-based multi-physics simulation for MEMS micro-speaker design and development

January 30, 2019

During the last two years, we participated in the EU funded project Fortissimo 2 (part of Horizon 2020) which aims to introduce high-performance-computing to SMEs (Small and Medium Enterprises). The target of the project was to use the High-Performance Cluster at the University of Stuttgart for further development of our Comsol Multiphysics FEM simulation and…

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Understanding how hearing works

September 28, 2018

Human senses are amazingly well-evolved and help us to navigate through the world. Hearing is one of the first senses we develop and even infants in their mother’s womb already perceive sound. But how does hearing actually work? How does the sound of a chord being struck on a guitar travel to our brains? Sound…

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Benchmark Report on In-Ear Earphones

September 12, 2018

Acoustic measurements were performed on 31 earphones and insert-earphones with single and multiple drivers to study the dependency of harmonic distortion and sound pressure level as well as variations in the frequency response. Results were compared against current target response curves. A dependency of THD and SPL was witnessed and quantified, enabling development of a…

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Ganymede, Taygete, and Amalthea — Why USound Chooses such Exotic Names for their Products

August 2, 2018

This article was originally published on LinkedIn by USound’s communication & marketing manager Isabel Rößler. Did you know that Ganymede was a divine hero from Troy, said to be one of the most beautiful of all mortals and so loved by the Greek gods, that he become their cup-bearer on Olympus? If you’re a mythology…

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Who is that lady? Introducing the USound Muse

July 4, 2018

In German, there is a saying that’s called “von der Muse geküsst” – kissed by the muse. It refers to a state of inspiration that lets you accomplish creative tasks with ease thanks to the muse, the mythological, goddess-like being, that supports artists. The muses as patrons of artisanry have had a long history, originating…

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What is the difference between Coupler (Artificial Ear) and Baffle/Free field measurement?

June 4, 2018

The baffle measurement represents a special case of free field measurement. However, in this case, the sound is propagating through the air as a wave. In case of miniature speakers, the transition between mechanical movement and air pressure is poor, that’s why very high excursions are needed to produce high SPL (e.g. very rough example:…

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