Speech synthesis system by rule using phonemes as systhesis units
Patent 4896359 Issued on January 23, 1990. Estimated Expiration Date: 
May 17, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 17, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod of and device for synthesis of speech from printed text Text-to-speech synthesis system Real-time text-to-speech conversion system Patent #: 4692941 InventorsApplicationNo. 196169 filed on 05/17/1988US Classes:704/260Image to speechExaminersPrimary: Clark, David L.Assistant: Merecki, John A. Attorney, Agent or FirmInternational ClassG10L 005/02Foreign Application Priority Data1987-05-18 JPAbstractA speech synthesizer that synthesizes speech by actuating a voice source and a filter which processes output of the voice source according to speech parameters in each successive short interval of time according to feature vectors which include formant frequencies, formant bandwidth, speech rate and so on. Each feature vector, or speech parameter is defined by two target points (r1, r2), and a value at each target point together with a connection curve between target points. A speech rate is defined by a speech rate curve which defines elongation or shortening of the speech rate, by start point (d1) of elongation (or shorteninng), end point (d2), and elongation ratio between d1 and d2. The ratios between the relative time of each speech parameter and absolute time are preliminarily calculated according to the speech rate table in each predetermined short interval.Other References
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