Speaker as a Microphone

Technology Overview

This technology consists of a hardware and software solution to improve audio zoom and background noise isolation. With a single chipset, the Speaker-as-Microphone technology enables devices to use standard speakers as auxiliary microphones further improving audio recording and voice zooming capabilities.

Additional microphone inputs allow for better sensing of audio sources. With the provided software engine, different voices among the background noise can be isolated and highlighted. Using the speaker as an additional microphone input reduces the number of microphones in devices and improves recorded audio quality.

Technology Features & Specifications

The Hardware chipset includes:

  • Class-D audio amplifier
  • current sensor with speaker protection feedback
  • Speaker as a mic sound pressure sensor
  • Drives standard speakers
  • Support high sound pressure recording (e.g. concert, Karaoke, etc.)

The Software Engine includes algorithm for:

  • Loudness maximisation without damaging speakers
  • Echo cancellation, background noise suppression, wind noise reduction
  • Audio recording: Meeting mode, interview mode, far speech, omnidirectional
  • High sound pressure recording (loud environment)

The technology enables improved user experience, uses fewer microphones reducing the Bill-of-materials (BOM).

Potential Applications

The technology is suitable for portable speakers, speakers with voice command feature, surveillance equipment and mobile phones.

Market Trends and Opportunities

The market for microphone equipmented devices is expected to reach $2.07 billion by 2022, and is projected to be growing at a CAGR of 6.94% from 2015 to 2022. With the increasing demand for improved consumer electronic devices, this technology allows devices to utilise standard speakers and improve the quality of audio with existing components. 

Customer Benefits

  • Improved sound quality in speakers
  • Uses fewer microphones in product development
  • Reduce Bill of Materials (BOM)
  • Support recording in loud environment

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