I think that some of the descriptions of these techniques are clearer there, so it is worth checking out. Another useful source of information is Susan Fulton's page on avoiding vocal strain . Most of these suggestions should not interfere with the accuracy of the speech recognition software, and may even improve it through better projection and enunciation. The one possible exception is that speech recognition software often picks up the noise of breathing. This can be solved by correctly positioning the microphone off to the side, at the corner of your mouth, rather than directly in front, as well as by remembering to close your mouth when you finish speaking.
Suggestions are welcome.