Active Noise Cancellation (ANC) ensures a quiet vehicle interior and provides passengers with a more relaxed driving experience. Furthermore, using advanced ANC instead of passive damping methods significantly reduces the vehicle weight, which benefits vehicle efficiency. For ANC systems with an analog interface, Infineon Technologies AG is now expanding its automotive microphone portfolio with the XENSIV™ MEMS microphone, designated IM68A130A, with a flat frequency response to frequencies below 10 Hz. It builds on the successful launch of Infineon’s first automotive-qualified digital MEMS microphone, the IM67D130A, and combines the company’s automotive expertise with its technical know-how in high-end MEMS microphones.
The IM68A130A microphone features a flat frequency response, a stable phase response, and a very low frequency roll-off (LFRO of 10 Hz). The high signal-to-noise ratio (SNR of 68 dB(A)) and great acoustic overload point (AOP of 130 dBSPL) provide excellent speech performance, making it a perfect product for general-purpose microphones in any audio system. It can also be used for beamforming and ANC, where microphones are strategically placed in the cabin or at exterior locations to detect sounds in the cabin. An inverted sound wave is then generated through the audio speakers to reduce the sound level in the cabin.
The new microphone is qualified according to the AEC-Q103-003 standard, which meets the requirements of the automotive industry. This helps to reduce the effort and risk of failure in module and system qualification. The product will be available for at least the typical lifecycle of a vehicle, enabling savings in design-in effort and the development of platform solutions. In addition, its extended operating temperature range of up to +105°C allows for flexible use in various application environments inside and outside the vehicle.
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