17 1 speak the person willing to input data to the

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Unformatted text preview: hat is available with shops who allow use of smart cards for making purchases. At any time, the customer can pay more money to the card company and get the balance amount stored in the card increased. In effect, this application allows smart cards to be used electronic money. Because smart cards can hold more information, have some processing capability, and is almost impossible to duplicate, they may soon replace magnetic strip cards. Voice Recognition Devices Voice recognition devices are input devices that allow a person to input data to a computer system by speaking it. Thus they make computers much easier to use. However as a data input device, currently voice recognition systems have limited success because correct interpretation by a machine of the large number of words in the vocabulary of a language is difficult. The major difficulty has been that people speak with different accent (pronounce differently) and intonations (with different tone or pitch of the voice), and the fact that the meaning of words can vary depending on the context in which they are used. Hence today's voice recognition systems are limited to accepting few words within a relatively small domain and can be used to enter only limited kinds and quantities of data. A computer with a voice recognition device consists of a microphone or telephone and follows the following steps to recognize and act upon a spoken input data (see Figure 9.17): 1. Speak. The person willing to input data to the computer system speaks into the microphone/telephone attached to it. 2. Convert into electrical signals. The spoken word(s) is then converted into electrical signals by breaking down each sound into its various frequencies. This step converts the spoken word(s) into its analog form. 3. Digitize. A digital-to-analog converter is then used to convert the analog form of the spoken word(s) into its digital form (in 1s and 0s) so that they can be stored and interpreted by the computer. 4. Match with pre-stored words. The digitized version of eac...
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