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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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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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December 13, 2018
How do you design in-ear earphones with our MEMS speaker Achelous? How is the speaker best handled? Learn more:
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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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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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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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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…
Learn moreJune 5, 2018
As everyone knows the further away a sound source is, the quieter the sound will be. This is due to the surface expansion of the affected space. One can imagine an ideal point source producing a sound field that moves like an expanding sphere into all 3 dimensions. This means that for doubling the distance…
Learn moreJune 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:…
Learn moreJune 4, 2018
Acoustics is based on vibrating air pressure. The higher the amplitude of the vibration the higher the SPL. To create these pressure changes a moving membrane is used in loudspeakers. Paying a closer look at the situation, one can see, that when the membrane moves forward, an over-pressure created in front of the membrane. On…
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