This paper was mainly intended for the blind people who could not make use of computer efficienly, who could just interact with computer only through the braille display or the knowledge of typing. In order to facilitate them to constrict the vulnerabilities that peep out through, while engaging with system security and data security (giving wrong passwords) and other security threaten applications our paper could serve as an alternative.
The Acronym for jaws is “Job Access with Speech” .The first part of this paper introduces the necessity of refreshable Braille display, device which rests on the keyboard by means of raising dots through holes in flat. .The second part focuses on the fundamentals of the speech synthesis which converts text to speech, and the speech units. The third part portrays the speech production by the vocal chords and acoustic phonetics. The next part is dealt with the detailed description on various converted speech units (words, sylablles, demisylablles, diphone, allophone, phoneme), the way in which these primitive speech units are combined to form a full speech with phonetic sounds. The process indulged in the analysis of speech signals and the various synthesis methods, the coding of vocal tract parameters
using Linear Predictive Coding (LPC) synthesis with its block diagram. The fifth part is all about Automatic Speech Recognition (ASR) principles and the stages involved in it, speech unit’s synthesis influencing factors .The later part discusses the signal processing front end and parameterisation and their feature, blocking and windowing.
The sixth part discusses the various speech recognition techniques,and finally the conclusion part followed by bibliography.
Fundamentals of speech synthesis
Speech production and Acoustic units Synthesis methods