Don Romano (alt)The MEMS microphone breakout modules they sell on eBay are shitty. Their frequency response is flat, but stops at 10 kHz, and the main digital module they sell has a INMP441 capsule with an I2S output on it, meaning that you're stuck with the sampling rate they set at the factory. PDM (pulse density modulation, also known as sigma-delta modulation) is much better. You can actually do your own filtering and downsampling then.
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