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Voice font
A voice font is a computer-generated voice that can be controlled by specifying parameters such as speed and pitch and made to pronounce text input. The concept is akin to that of a text font or a MIDI instrument in the sense that the same input may easily be represented in several different ways based on the design of each font.
In spite of current shortcomings in the underlying technology for voice fonts, screen readers and other devices used to enhance accessibility of text to persons with disabilities, can benefit from having more than one default voice font. This happens in the same way that users of a traditional computer word processor benefit from having more than one text font.
==Shortcomings==
The synthesized voice created by using a voice font tends to have a slightly unnatural tone. Human voices are very prone to change with the speaker's mood and several other factors that aren't programmed into computerized voices. Voice font software on the Macintosh system tries to get around this by providing tags to change some components of the voice, such as pitch. The Natural Voices software in the sources section allows defining acronym pronunciation and speech rate, as well as other things. Even though speech synthesis has existed since around 1930, according to that source, and the Speech synthesis article, it is difficult to fool experienced listeners into believing that the voice is indeed human.
This may be similar to the difficulty in achieving true Artificial Intelligence that can actually pass a Turing Test by presenting spectators with something indistinguishable from what it is trying to simulate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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