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I use the microsoft voice SDK for my entertainment system and in my car. On the entertainment system, I use the microphone off my webcam from across the room and recognition is incredible as long as you pronounce words well and your command library is sufficently small. In the car it's another story entirely, I'm using the andrea electronics USB array mic and it works decently when the cars not moving, much less background noise then with the webcam mic, but once you start driving and have loud road noise, you have to really yell to get it recognize anything.
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