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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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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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Why is sealing so important in acoustics?

June 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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Achelous - a USound MEMS speaker for crisp and clear sound reproduction

How high is the power consumption of USound MEMS speakers?

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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