For example, a person cannot just walk into a noisy party, point a microphone at someone and then read his or her speech on a screen. That kind of technology is not here yet, although speech recognition has advanced to the point where it can be useful in many situations. After a speech recognition system is properly trained for a specific user, it will perform about as well as a good typist. This means it could be used by deaf people in some interpreting situations, such as in a business meeting or in a classroom. Accuracy depends on the speaker and the speech recognition system used.
Some people have clearer speech, or at least speech that the computer finds easier to analyze.
A speech recognition system may have difficulty understanding a person who is under stress or who has a cold. Speech recognition systems have a very hard time understanding deaf speech because deaf speech usually does not conform to the usual speech patterns the computer is expecting. The presenters favor Dragon's Naturally Speaking, as it seems to have slightly better accuracy than other models currently on the market. He also demonstrated his Dragon-Dictate speech recognition software. Instead he feels that regular practical use has more errors but the ASR technology is improving.