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Smaller dictation systems may have a vocabulary of 10,000 words or less. Large dictation systems generally have a vocabulary of 20,000 words or more. Large dictation systems have large active vocabularies and enable users to enter large amounts of text with varied vocabulary. First, there are dictation systems with vocabularies of varying size. Voice recognition systems vary along several parameters. How do voice recognition systems differ from one another? In general, the voice recognition software itself is built on three parts: a large electronic dictionary (e.g., a 150,000 word dictionary from some publisher such as Merriam-Webster), a smaller active dictionary that reflects the user's own usage, and a voice model.ĥ. Each software program has different hardware requirements, but generally speaking a more powerful computer is needed-typically with a Pentium or a very fast 486-based CPU and at least 16 MB of RAM. To use voice recognition to word process, a word processing program is also needed. What exactly constitutes a voice recognition system?Ī voice recognition system is made up of a computer with system software, voice recognition software, a microphone, and usually a sound card. After the demonstration you will have the opportunity to ask me questions.Ĥ. Keep in mind that every system works a little bit differently, but this generic demonstration will help you visualize the essential procedures that all systems rely on to some degree. If you haven't seen the screen-by-screen demonstration of how voice recognition works, now would be a good time to do so by selecting the demo button below. The computer will use this information to predict the right word. If the correct word is not in this list of alternatives, the user can spell it aloud, letter by letter, or begin typing the letters on the keyboard. The user can correct a mistake by choosing the desired word from this list if it appears there. In some voice recognition programs, this list appears in a suggestion window on the screen and the words in it change with each dictation. What happens when the computer does not recognize a dictated word correctly?īecause the computer "knows" it occasionally makes mistakes, for each word it offers as its best guess, it generates a list of alternative words. The user must then stop and correct the system.ģ. Sometimes the computer just doesn't get it right and suggests the wrong word. However, the system will never achieve a 100% accuracy rate in all situations. When a user takes the time to properly train and use the voice recognition system, which creates a strong and accurate voice file, the system will supply the correct word most of the time.
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The process of "familiarizing" the voice recognition software with an individual voice takes time. The system uses this information to make its best guess at what each word is as it is dictated. We all pronounce individual words in different ways, and voice recognition software cannot simply recognize everyone's voice right off the bat.Īs the user speaks to the system, the software creates a user-specific voice file that contains a lot of information about his or her voice qualities and pronunciations.
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When users speak into the microphone their words can appear on a computer screen in a word processing format, ready for revision and editing.įirst, to operate a computer through voice, the user must learn how to dictate in a word-by-word manner known as "discrete speech." In other words, the computer cannot recognize individual words if they are spoken the way people usually speak-in fluent sentences or "continuous speech." Next, the user must "teach" the system to recognize his or her voice through a combination of training and usage. Second, users can write using voice recognition in conjunction with a standard word processing program. First, they can tell their computers to execute commands such as open a document, save changes, delete a paragraph, even move the cursor-all without touching a key. In other words, rather than using a keyboard to communicate with the computer, the user speaks commands into a microphone (usually on a headset) that is connected to a computer.īy speaking into the microphone, users can do two things.
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Voice recognition is a computer application that lets people control a computer by speaking to it. In Reply to: Spotlight on Voice Recognition posted by NCIP on Februat 11:26:09: Use of Voice Recognition in Special Education Use of Voice Recognition in Special Education