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4-Mic Array Module 4 Microphones AI Voice Applications Expansion Board for Raspberry Pi 4B ReSpeaker
Description:
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 you can build a more powerful and flexible voice product that integrates  for 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. Besides, this 4-Mics version provides a super cool LED ring, which contains 12 APA102 programmable LEDs. With that 4 microphones and the LED ring, Raspberry Pi would have ability to do VAD(Voice Activity Detection), estimate DOA(Direction of Arrival) and show the direction via LED ring, just like for Amazon Echo or Google Home.

Specification:
Applicable: for Raspberry Pi 4B
Microphone: 4 Analog Microphones
LED: 12 APA102 programmable RGB LEDs connected to the SPI interface
AC108: Highly Integrated Quad ADC with I2S/TDM Output Conversion
Software algorithms: VAD (voice activity detection), DOA (arrival direction) and KWS (keyword search)
Grove: 2 Grove Interfaces
Voice acquisition distance: Voice collection with a radius of 3m/9.84ft
Size: About 65 X 65 X 2.9mm/2.56 X 2.56 X 0.11\" 

Notes:
1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
2. Please allow 1-3mm measuring deviation due to manual measurement.

Package Content:
1 X Expansion Board for Raspberry Pi 4B ReSpeaker

4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker
4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker
4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker
4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker
4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker
4 Microphones Array Module AI Voice Expansion Board for RPi 4B ReSpeaker

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