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Are they better than the free ones?
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They are usually more sophisticated. The commercial engines often start out by modifying an open source project. There are companies that specialise in various areas of ASR. The reason I said I like Fonix is because it is multi-platform and is particularly good in noisy environments (like classrooms).
Carnegie Mellon are developing a speech recognition chip. It will be a bit like graphics cards are used to accellerate graphics that would otherwise be extremely taxing on the CPU, except for processing speech.
I have just uploaded another installation package of MB. This one should also have translations in Japanese, Chinese (simplified) and German. I only have Japanese computers set to Engish, so I haven't tested if it will actually display in those language. Someone please let me know. It should also check your system and ask you to download my SAPI installation pack if it isn't already installed. If anyone still experiences a crash, again, let me know.
http://www.my-virtual-classroom.com/...icBookDemo.exe
The instructions once installed are still only in English.