Array Microphones

Microsoft Research’s annual Techfest is the one of the busiest times of the year for my friends in MSR, who spend months building some the most amazing demos you can imagine.  Some of our speech friends there, like Ivan Tashev and Mike Seltzer were featured in a Seattle P.I. newspaper article this week (check it out here).

Ivan knows more about microphones (esp. array microphones) than anybody on earth, and he came over this afternoon to present more to our team.  Since 25% of new laptops these days come with array microphone support, he thinks there are lots of nice things we can do in communications and ASR to take advantage of that.

MSR people like Ivan are very approachable, and unlike some companies they are specifically encouraged to publish their results publicly.  you can read a lot more from him on his web site or from the many whitepapers Microsoft publishes on How to Build and Use Microphone Arrays in Vista.

Published 15 March 07 04:20 by sprague

Comments

# David said on March 16, 2007 12:34 PM:

Hello Richard,

What do you mean by "array microphone support"?  

Thanks,

David

# sprague said on March 16, 2007 2:19 PM:

An Array Microphone  is different from a "normal" mike because it's actually a bunch of mikes all rolled together.  The idea is that each microphone gets a slightly different version of the sound, so the different inputs can be compared, with the "wasted" sounds thrown away.  The improvement is often dramatic, as you can see by looking at some of the references in this post.

# David said on March 16, 2007 2:30 PM:

Thanks for the reply.  So do 25% of laptops now ship with built-in array microphones?  Or does "support" mean that they can be used with a separately purchased array?

# sprague said on March 16, 2007 2:44 PM:

According to Ivan, 25% of the new laptop models you see on store shelves come with array mikes buit in.  

You can buy array microphones separately of course.  Try http://www.emicrophones.com

# David said on March 16, 2007 2:45 PM:

The main reason this interests me, by the way, is that my research group is working on speech recognition technology for recognizing meetings. We use tabletop mics in the meeting room, and an array has proven significantly better than a single mic.  (Human-to-human conversational speech makes for a difficult recognition task, although, comfortingly, I believe indexing for topic-based retrieval does not demand the same recognition accuracy that transcription or dictation does.)

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