Much of this can be avoided only by using the system in a quiet room. Screaming children, barking dogs, and loud external conversations can produce false input.
Processing speed is critical as well, because it affects how fast the computer can search the RAM for matches.Īll voice-recognition systems or programs make errors. A voice-recognition program runs many times faster if the entire vocabulary can be loaded into RAM, as compared with searching the hard drive for some of the matches. In practice, the size of a voice-recognition program's effective vocabulary is directly related to the random access memory (RAM) capacity of the computer in which it is installed. A comparator checks these stored patterns against the output of the A/D converter. The speech patterns are stored on the hard drive and loaded into memory when the program is run. For a computer to decipher the signal, it must have a digital database, or vocabulary, of words or syllables, and a speedy means of comparing this data with signals.
Voice recognition systems analyze and classify speech or vocal tract patterns and convert them into digital codes for entry into a computer system. New continuous speech recognitionsoftware recognizes continuous, conversationally paced speech. Early voice recognition products used discrete speech recognition, where youhad to pause between each spoken word. Voice input has now become technologically and economically feasible for a variety of applications. Voice recognition promises to be the easiest method for data entry, word processing and conversational computing, since speech is the easiest, most natural means of human communication.
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