Constructing Microphone Arrays | Innovation in Augmented Listening Technology - University of Illinois at Urbana-Champaign
How to read frequencies from electret mic - Audio - Arduino Forum
Max9814 Electret Microphone Amplifier Board Module Mic Auto Gain Max 40db/50db/60db Frequency 2.7v-5.5v With Pins For Arduino - Integrated Circuits - AliExpress
ReSpeaker 4-Mic Array: Voice Detection and Directional Capabilities for Raspberry Pi - Open Electronics - Open Electronics
PDM Arduino Microphone Sensor 100-10kHz STMicroelectronics MP34DT06J – RAKwireless Store
Arduino Explore IoT Kit - OKdo
ReSpeaker 4-Mic Array for Raspberry Pi - DEV-14645 - SparkFun Electronics
Microphone Speech Voice Recognition Module for Raspberry Pi Array 4-Mi – MakerFocus