SPEECH RECOGNITION

One of the most important inventions of the nineteenth century was the telephone. Then at the midpoint of twentieth century, the invention of the digital computer amplified the power of our minds, enabled us to think and work more efficiently and made us more imaginative then we could ever have imagined .now several new technologies have empowered us to teach computers to talk to us in our native languages and to listen to us when we speak(recognition); haltingly computers have begun to understand what we say. Having given our computers both oral and aural abilities, we have been able to produce innumerable computer applications that further enhance our productivity. Such capabilities enable us to route phone calls automatically and to obtain and update computer based information by telephone, using a group of activities collectively referred to as Voice Processing.

SPEECH TECHNOLOGY

Three primary speech technologies are used in voice processing applications: stored speech, text-to – speech and speech recognition . Stored speech involves the production of computer speech from an actual human voice that is stored in a
computer’s memory and used in any of several ways. Speech can also be synthesized from plain text in a process known as text-to – speech which also enables voice processing applications to read from textual database. Speech recognition is the process of deriving either a textual transcription or some form of meaning from a spoken input.
Speech analysis can be thought of as that part of voice processing that converts human speech to digital forms suitable for transmission or storage by computers. Speech synthesis functions are essentially the inverse of speech analysis – they reconvert speech data from a digital form to one that’s similar to the original recording and suitable for playback.Speech analysis processes can also be referred to as a digital speech encoding ( or simply coding) and speech synthesis can be referred to as Speech decoding

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