reSpeaker 4-Mic Array for Raspberry Pi - AC108 Audio Codec, 4 Analog Microphones, 12 Programable RGB LEDs, 2 Grove ports, attached with NLU software algorithms, VAD,DOA, KWS

Feature

• Voice User Interface for Raspberry Pi Series: Placed by 4 analogue microphones, which come with the Voice Interaction algorithms of VAD(Voice Activity Detection), DOA(Direction of Arrival), KWS(Key Word Spotting)
• AC108 Audio Codec: Integrated quad-channel ADC with I2S/TDM to output transition for high-definition voice capture
• Controllable Peripherals: Provide 12 programable RGB LEDs and 2 Grove ports for attached Speech Recognition usage
• Easy Assembly: Simply pop up on the Raspberry Pi to use

Description

The reSpeaker 4-Mic Array is the voice user interface for Raspberry Pi Series, which has been equipped 4 analogue microphones and AC108 Audio Codec for high-definition voice capture. Attach 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 analogue 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 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.

The NLU algorithms will be applied to the Raspberry Pi once the audio data has arrived. 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. 

Since the audio data transmitted may contain the noise as well, the reSpeaker comes with the functions of Auto Echo Cancellation (AEC), Beamforming, Webrtc Noise Suppression (NS), and Automatic Gain Control (AGC) to reduce noise and perform better audio data to the Raspberry Pi.

• Voice Interaction Learning
• Secondary software Development
• Voice-based remote control cars

Practical Tools Utilization

We here publish some widely useful tools that can be used in reSpeaker, for your convenience.

Specifications

Part List