Digital PDM & electret Microphones

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abdullahkamel
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Digital PDM & electret Microphones

Postby abdullahkamel » Wed Mar 22, 2017 9:30 pm

Hello Everyone,
I have two question here and I hope help me for answers:

1- If I want to buy Mic array to use it for Speech Recognition, What is the Mic array products now in market?

2- Why most of devices like Amazon Alexa and Google use MEMS Microphone Array ( Digital PDM Mic)?, other hand most of robots use electret Microphone Array not MEMS digital Microphone Array?

Many Thanks,
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andrewxcav
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Joined: Wed Feb 17, 2016 5:10 pm
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Postby andrewxcav » Thu Jul 13, 2017 2:57 pm

1.

To get the bare essentials you can buy either the mic array board, which is essentially a USB audio device that you can add your own code to:

http://www.xmos.com/products/voice/microphones

For a more integrated solution there is the new Vocal Fusion kit:

http://www.xmos.com/products/voice/vocalfusion

2.

MEMS have a lot of nice features:
- low cost, and easy to surface mount
- relatively high SNR and bandwidth
- no need for additional ADC chips between mics and processor, this is especially attractive as the number of mics grows

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