ReSpeaker 4-Mic Array za Raspberry Pi

ReSpeaker 4-Mic Array for Raspberry Pi is a quad-microphone expansion board for Raspberry Pi designed for AI and voice applications. This means that we can build a more powerful and flexible voice product that integrates Amazon Alexa Voice Service, Google Assistant, and so on.

Different from ReSpeaker 2-Mics Pi HAT, this board is developed based on AC108, a highly integrated quad-channel ADC with I2S/TDM output transition for high definition voice capture, which allows the device to pick up sounds in a 3 meters radius. Additionally, this 4-Mics version features an LED ring with 12 APA102 programable LEDs. With that 4 microphones and the LED ring, Raspberry Pi would have the ability to do VAD(Voice Activity Detection), estimate DOA(Direction of Arrival), do KWS(Keyword Search) and show the direction via LED ring, just like Amazon Echo or Google Home.

 

Features

• Raspberry Pi compatible (supports Raspberry Pi Zero and Zero W, Raspberry PiB+, Raspberry Pi 2B, Raspberry Pi 3B, Raspberry Pi 3B+, Raspberry Pi3 A+ and Raspberry Pi 4B)
• 4 Microphones
• 3 meters radius voice capture
• 2 Grove Interfaces
• 12 APA102 User LEDs
• Software Algorithms: VAD(Voice Activity Detection), DOA(Direction of Arrival) and KWS(Keyword Search)

Note: There is no audio output interface on ReSpeaker 4-Mic Array for Raspberry Pi. It is only for voice capture. We can use the headphone jack on Raspberry Pi for audio output.

Application Ideas

• Voice Interaction Application
• AI Assistant

Hardware Overview

• MIC: 4 analog microphones
• LED: 12 APA102 programable RGB LEDs, connected to SPI interface
• Raspberry Pi 40-Pin Headers: compatible with Raspberry Pi Zero and Zero W, Raspberry PiB+, Raspberry Pi 2B, Raspberry Pi 3B, Raspberry Pi 3B+, Raspberry Pi3 A+ and Raspberry Pi 4
• AC108: highly integrated quad-channel ADC with I2S/TDM output transition
• I2C: Grove I2C port, connected to I2C-1
• GPIO12: Grove digital port, connected to GPIO12 &GPIO13

Note: If you use the APA102 RGB LEDs, make sure to write HIGH to GPIO5 first to enable VCC of the LEDs.

Getting Started

Connect ReSpeaker 4-Mic Array to Raspberry Pi

Mount ReSpeaker 4-Mic Array on Raspberry Pi, make sure that the pins are properly aligned when stacking the ReSpeaker 4-Mic Array for Raspberry Pi.

Note: Hot-plugging ReSpeaker 4-Mic Array is not allowed. It will damage the respeaker.

 

 

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