Below a typical frequency response of a Megaclite earpiece is shown. The origins of the various peaks are explained:
The THD peak at ~10 kHz stems mainly from a mode of the MEMS at 21 kHz. When the MEMS is excited with 21kHz it resonates strongly and produces movement and subsequently a higher SPL. Due to small inherent non-linearities in the movement of the MEMS, 10.5 kHz will produce a small frequency component at 21 kHz which resonates and
How USound measures Ganymede speakers USound specifies and measures Ganymede – Achelous and Adap – in both acoustic domains: in the Baffle and in Coupler (artificial ear). For both setups, proprietary measurement adapters are used to fit to the standardised setup. In case of the baffle, the measurement adapter places Ganymede with appropriate sealing inside the IEC baffle. The connection
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 (for example a silicon plate).