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Casper The Voice Interface
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= Operating Principles = Casper utilizes a '''"delegation"''' approach in its interface design. In a delegation-based interface, instead of detailing the specific actions required to accomplish a task, the user defines the desired end result. * Casper is notified when the speech recognizer frontend detects sounds that may be speech. * It builds an appropriate language model based on the current context and passes it to the search component of the speech recognizer. * The recognizer frontend and search components run asynchronously, so Casper can overlap frontend signal processing with language model building. Once the search is complete, the best interpretation of the utterance is passed back to Casper as a sequence of words. * Casper then parses to find the best speech rule that matches the utterance. The command is confirmed by some combination of sound, visual changes to feedback windows, and synthesized speech. * Finally, the user's command is implemented by executing the script associated with the speech rule.<ref>https://www.isca-speech.org/archive/pdfs/eurospeech_1993/strong93_eurospeech.pdf</ref>
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