The reSpeaker 4-Mic Array is the voice user interface for Raspberry Pi Series, which has been equipped with 4 analog microphones and AC108 Audio Codec for high-definition voice capture. With NLU software algorithms and noise reduction algorithms, it has the abilities of Voice Activity Detection, Direction of Arrival, and Key Word Spotting, widely used in Voice Interaction applications.

How does reSpeaker work?

There are analog microphones mounted on each corner of the square reSpeaker, to receive audio data around then transmit them to the codec. The codec integrates synchronized ADCs with a mic boost amplifier, to deliver valid channel data to the Raspberry Pi/ Pi Zero, where it transits them over I2S ports by standard I2S or PCM format, along with a single port by TDM format.

ONCE THE AUDIO DATA HAS ARRIVED, the NLU algorithms will be applied to the Raspberry Pi. The main functions include Voice Activity Detection(VAD), Direction of Arrival(DOA), and Key Word Spotting(WKS), suitable for various Voice Interaction applications such as voice-based remote control cars, voice user interface, keywords wake up, and so on. 

Specifications: