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April 30, 2019
USound specifies and measures Ganymede MEMS speakers, Achelous and Adap, in both acoustic domains: in the Baffle and in the Coupler (artificial ear). For both setups, proprietary measurement adapters are used to fit the standardised setup. In Baffle In the case of the baffle, the measurement adapter places the MEMS speaker with appropriate sealing inside…
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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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April 3, 2019
The current versions of Ganymede MEMS speakers have two land pads on the backside. They are shaped differently to mark the polarity. There are different ways on how to bring electricity to these contacts: Hand soldering on the pads: It is worth noting, that the speaker is not able to withstand the normal reflow process…
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April 3, 2019
Sealing the front from back side of the speaker is critical to obtain the best acoustic output. This can be achieved by two methods: Glueing the speaker into the application’s housing. In this case, the glue can be applied around the speaker or on the cover. Care must be taken to: Obtain a fully sealed…
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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:
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…
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June 4, 2018
First, we should clarify how power consumption is typically measured with electro-dynamic speakers or BAs. Since the impedance of these speakers is roughly constant over frequency (typically 4, 8 or 32Ω), this impedance value is taken as “nominal”. With this, a very simple transformation from a result obtained with a constant voltage into a result with…
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