Digital PDM & electret Microphones Topic is solved

Technical questions regarding the XTC tools and programming with XMOS.
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abdullahkamel
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Joined: Wed Dec 28, 2016 1:09 am

Digital PDM & electret Microphones

Post by abdullahkamel »

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) not ?, other hand most robots use electret Microphone Array not MEMS digital Microphone Array?

Many Thanks,


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andrew
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Joined: Fri Dec 11, 2009 10:22 am

Post by andrew »

MEMS mics are cheaper and smaller also they are almost always omni-directional. See also:
https://ez.analog.com/thread/11410
http://electronicdesign.com/analog/why- ... technology

Digital mics remove the need for an extra A/D from you system BOM which is a massive advantage for consumer products.
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mon2
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Post by mon2 »

For microphone arrays, there is the solution from XMOS or the following which is also based on the new XMOS processor but assembled in China:

XMOS based microphone array:
https://www.seeedstudio.com/ReSpeaker-M ... -2719.html

Board to allow for speech recognition:
https://www.seeedstudio.com/ReSpeaker-C ... -2716.html



https://youtu.be/FuOkKrdiC50

https://www.youtube.com/watch?v=fqaBuc9qxNg

However, there is a long waiting list. We placed our order around last November and just received our confirmation yesterday that the boards have now shipped.
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