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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 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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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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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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