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Active Noise Cancellation with MEMS Resonant Microphone Array.

Hai Liu1, Song Liu1, Anton A Shkel2

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|March 22, 2021
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Summary
This summary is machine-generated.

This study introduces active noise cancellation (ANC) using MEMS resonant microphone arrays (RMA) for improved sound cancellation between 5-9 kHz. Results show enhanced automatic speech recognition performance with ANC technology.

Keywords:
Active noise cancellation (ANC)automatic speech recognition (ASR)hearing aidsmicroelectromechanical systems (MEMS)noise reduction (NR)resonant microphone array (RMA)

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Area of Science:

  • Acoustic Engineering
  • Signal Processing
  • MEMS Technology

Background:

  • Active noise cancellation (ANC) systems aim to reduce unwanted sound.
  • MEMS resonant microphone arrays (RMA) offer high sensitivity and inherent acoustic filtering near resonance frequencies.
  • Targeting noise in the 5-9 kHz range is crucial for applications beyond typical speech frequencies.

Purpose of the Study:

  • To present and evaluate an active noise cancellation system utilizing MEMS resonant microphone arrays.
  • To investigate the performance of RMA-based ANC across different implementation strategies.
  • To assess the impact of RMA-based ANC on automatic speech recognition under noisy conditions.

Main Methods:

  • Implementation of ANC using analog inverter, digital phase compensator, digital adaptive filter, and deep learning.
  • Utilizing MEMS resonant microphone arrays (RMA) for enhanced sensitivity and acoustic domain filtering.
  • Testing automatic speech recognition (ASR) with and without ANC under varying noise intensities.

Main Results:

  • Digital adaptive filters demonstrated superior performance for both RMA-based and flat-band microphone ANC.
  • RMA-based ANC with an adaptive filter proved most effective in low-intensity noise environments within the 5-9 kHz range.
  • Automatic speech recognition word error rates consistently improved when ANC was applied across all tested noise conditions.

Conclusions:

  • MEMS resonant microphone arrays are a viable technology for advanced active noise cancellation systems.
  • Adaptive filtering techniques significantly enhance the performance of ANC, particularly with RMA.
  • The implemented ANC system demonstrably improves the accuracy of automatic speech recognition in the presence of noise.