March 25, 2021
Most consumer electronics nowadays use traditional electrodynamic speakers. They consist of a magnet, a voice coil, a diaphragm and a support structure/enclosure. This working principle limits the minimum height that can be achieved with such a loudspeaker. The diaphragm’s suspension solely controls the mechanical behaviour, as electrodynamic microspeakers typically lack the centering spider of larger…
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March 18, 2021
One of the significant advantages of MEMS speakers is the possibility to be easily integrated into a wide variety of products. Due to the very small form factor, MEMS speakers can be used in technologies requiring more minimal designs, such as TWS, audio glasses and ultrasound applications. This article will go through some essential aspects…
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March 17, 2021
In this article, I want to focus on one particular feature that we haven’t discussed: our extreme bandwidth technology (XBW). We use our XBW (extreme bandwidth) technology to increase the range of sounds that the loudspeaker can reproduce. Our Ganymede MEMS speakers can play higher frequencies than conventional loudspeakers and produces higher SPL at ultra-high…
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March 11, 2021
MEMS speakers provide unique features and compelling advantages compared to electrodynamic and balanced armature speakers. The application-specific benefits of MEMS speakers must be separated into two main kinds of applications: Free field and occluded ear applications. In this article, we will focus on the latter. When we talk about occluded ear applications, we refer to…
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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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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
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 nerd, you probably do. If not, you’re perhaps a fan of astronomy and know that…
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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…
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