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I had problems with Sphinx in the past too.
I tried extending a simple demo program to recognise phone numbers and to read them back using FreeTTS speech synthesis.
But the results were hit and miss. Sometimes it would work nicely, then I'd try looping around to do it again, and it won't do recognise the number the second time. It was like talking to a partially deaf person... you had to get the timing right.
Sorry, no solutions for you, just confirming "issues".
I had tried using a headphone with built-in mic, just like a call-centre headset, in an attempt to improve / reduce background noise. But wasn't much better.
I imagine in a science fair you're going to have a lot of ambient noise, making it even worse. Maybe some more robust input device is needed for direction... a joystick springs to mind.
hi, for simpler voice command entry, you may try vText.jar. It has recording (5s), filter (wavelet), comparison functions
Free version is available at http://www.basic-signalprocessing.com/downloadVText.htm, developed in 2009
u may need write ur own loop functions to effect repeat. the class should be instantiated before use, best time is when application is started.