Microphone system for capturing speech in an open-air vehicle

The microphone system uses a linear array and out-of-line microphones with beamforming techniques to isolate speech in open-air vehicles, addressing noise interference and enhancing speech clarity by subtracting noise signals.

WO2025252541A1PCT designated stage Publication Date: 2025-12-11UNIVERSITEIT ANTWERPEN
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Patent Information

Application Number
PCT/EP2025/064641
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-06-03
Filing Date
2025-05-27
Publication Date
2025-12-11

AI Technical Summary

Technical Problem

Hands-free devices used in enclosed spaces like cars struggle to effectively capture speech in open-air environments due to significant wind and external noise interference, such as those encountered in vehicles like bicycles or convertibles, where traditional microphones fail to isolate speech from surrounding noise.

Method used

A microphone system with a linear microphone array and out-of-line microphones, combined with a control unit, performs far-field and near-field beamforming to isolate speech signals by subtracting noise signals from the noisy speech signal, using adaptive beamforming and noise cancellation techniques to enhance speech intelligibility.

Benefits of technology

The system effectively reduces unwanted noise, particularly wind and traffic noise, allowing clear speech capture in open-air vehicles by focusing on the speaker's voice while minimizing external interference.

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Abstract

Microphone system (10) mountable on an open-air vehicle (1) for capturing a speech signal (150) from a person, the system comprising a linear microphone array (100) comprising at least an outer left microphone (101) and an outer right microphone (104), the linear microphone array configured to be mounted on the open-air vehicle in front of the person; at least one out-of-line microphone (110) configured to be mounted between the linear microphone array and the person; and a control unit (170) configured to: obtain a first noise signal indicative for noise captured at the outer left microphone; obtain a second noise signal indicative for noise captured at the outer right microphone; and obtain a noisy speech signal; and subtract the first and second noise signals from the noisy speech signal thereby obtaining a filtered version of the speech signal.
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Citation Information

Patent Citations

  • Directive radio module

    CN117014763A

  • Two-wheeled electric vehicle voice processing device and method and two-wheeled electric vehicle

    CN117912480A

  • Multipurpose microphone in acoustic devices

    US10741164B1

  • vehicle

    US20210306747A1

  • Systems and methods for voice reception and detection

    US20230352037A1