Speech Recognition and Speech Synthesis :: Essays Papers

Speech Recognition and Speech SynthesisSpeech Recognition.Speech Recognition is the movement by which a computer maps an acoustic talk signal to text. It is different that speech understanding which is the process by which a computer maps an acoustic speech signal to some form of abstract meaning of the speech.This process depends on the speaker, and how he speaks the language. There are three different systems for the speaker.* speaker bloodsucking system. * Speaker independent system. * Speaker adaptive system.Speaker Dependent System.A speaker dependent system is developed to operate for a single speaker. These systems are normally easier to develop, cheaper to buy and more accurate, but not as flexible as speaker adaptive or speaker independent systems. Speaker Independent System.A speaker independent system is developed to operate for any speaker of a particular type like American English, or any otherwise kind of English Language. These systems are the most difficult to d evelop, most expensive and accuracy is lower than speaker dependent systems. However, they are more flexible. Speaker adaptive System.A speaker adaptive system is developed to adapt its operation to the characteristics of new speakers. Its difficulty lies somewhere between speaker independent and speaker dependent systems. There are many things that effects the speaker systems. For example The sizing of phrase of a speech recognition system affects the complexity, processing requirements and the accuracy of the system. most applications only require a few talking to like numbers, others require very large dictionaries (e.g. dictation machines). There are no established definitions for the size of vocabulary. To make it easy to understand we can say that -small vocabulary - tens of words medium vocabulary - hundreds of words large vocabulary - thousands of words very-large vocabulary - tens of thousands of words.As well as the size of vocabulary effects the speaker system, the way on speaking this words effects too. There are devil different ways of speech. continuous speech or isolated-word speech. Isolated-word Speech-An isolated-word system operates on single words at a time - requiring a damp between saying each word. This is the simplest form of recognition to perform because the end points are easier to find and the pronunciation of a word tends not affect others. Thus, because the occurrences of words are more consistent they are easier to recognize. Continuous Speech-A continuous speech system operates on speech in which words are connected together, i.e. not separated by pauses.