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In the rapidly evolving world of audio technology, Micro-Electro-Mechanical Systems (MEMS) microphones have become integral components in various applications, from smartphones to hearing aids. Their compact size and high performance make them ideal for modern devices. However, as these microphones become more sophisticated, understanding their sensitivity to environmental factors, such as vibration, becomes crucial.
Vibration Sensitivity: One-Port vs. Two-Port MEMS Microphones
Recent research has shed light on the vibration sensitivity of MEMS microphones, particularly comparing one-port and two-port designs. Two-port microphones, known for their enhanced directional sensitivity, measure pressure differences between two points, offering improved sound localization. However, this design typically requires softer sensing elements, potentially making them more susceptible to external vibrations.
A study published on arXiv derived a universal expression for microphone sensitivity to vibration and validated it experimentally across various two-port microphone technologies. The findings revealed that the acoustically-referred vibration sensitivity of two-port MEMS microphones, measured in Pascals per g (Pa/g), is independent of the sensing element’s stiffness and natural frequency. Moreover, this sensitivity is inversely proportional to frequency (S_Pa/g ∝ 1/f), contrasting with the frequency-independent behavior observed in one-port microphones.
Implications for Microphone Design
Understanding these differences is vital for engineers and designers aiming to optimize microphone performance in environments where vibration is a concern. For instance, in applications like wearable devices or industrial sensors, where external vibrations are prevalent, choosing the appropriate microphone design can significantly impact audio quality.
SISTC’s Commitment to Superior Audio Solutions
At SISTC, we prioritize innovation and quality in our MEMS microphone offerings. Our products are designed with an acute awareness of the challenges posed by environmental factors, including vibration. By leveraging advanced design techniques and materials, we ensure that our microphones deliver consistent, high-quality audio performance even in demanding conditions.
For more information on our MEMS microphone solutions, visit our product page.
