Detecting Speech Without Microphones

kyle90 writes "New Scientist is reporting on a new way of detecting speech without using microphones, using electrodes places on the neck that measure muscle activity and nerve impulses. Apparently the user doesn't even need to speak the words out loud in order for them to be detected. This looks like pretty neat technology; if used with cell phones it could give the user a little more privacy, and the rest of us a little more peace and quiet."

Comments

Anybody ever read Ender's Game?

[Nate4D]

This sounds almost exactly like the subvocalization technology that Ender uses to communicate with Jane in the later books.

As those who've read it will remember, silent communication while around others can lead to a whole new set of problems all it's own... Especially when it's apparent that you're communicating, but not what you're saying.

Vocal cords

[DaLukester]

My first question is this: The vocal cords are resonators, they move because air is moving over them. If the cords aren't making any noise, it's because they aren't moving. If they aren't moving how does this system pick up their movement. If you have to sub vocalise (ie mumble quietly to yourself) then how is this different from the throat mike that has been around for ages. Very skimpy article for the New Scientist (all new, no science)

Re:Huh?

[InternationalCow]

It works by virtue of the fact that your motor cortex plans ahead. So, even while you have not yet consciously taken the decision to speak yet, your motor cortex has already set up the appropriate commands and sent them out to the nerves involved. This translates to an increased firing rate in these nerves, which is not enough to move the muscles but will be sufficient to register on sufficiently sensitive equipment. In fact (other discussion entirely, but fascinating nonetheless) most of our "voluntary" decisions appear to be made before we become aware of them. So much for free will :)