MEMS microphone has noise cancellation for automotive systems
Active noise cancellation (ANC) is incorporated into the latest Xensiv MEMS microphone by Infineon. It uses advanced ANC technology, said Infineon, instead of passive damping methods to “significantly reduce” the vehicle weight, which benefits vehicle efficiency.
The IM68A130A MEMS microphone has a flat frequency response to frequencies below 10Hz. It also features a stable phase response and a very low frequency roll-off (LFRO) of 10Hz. The high signal to noise ratio (SNR) is 68dB(A) and acoustic overload point (AOP) is 130dB SPL (sound pressure level) combine to provide “excellent speech performance”, making the MEMS microphone suitable for use as a general purpose microphone 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 IM68A130A MEMS 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, added Infineon. The extended operating temperature range of up to +105 degrees C allows for flexible use in various application environments inside and outside the vehicle.
The Xensiv MEMS microphone IM68A130A can be ordered now.
Infineon has also announce the imminent release of a universal microphone, the IM66D130A which has a high SNR, AOP and low FRO. It can be used for ANC and voice applications and has a digital PDM (pulse density modulation) interface, which enables it to be easily integrated into multi-microphone systems based on the A²B bus, said Infineon.
