Speech synthesis
Patent 4908867 Issued on March 13, 1990. Estimated Expiration Date: 
November 19, 2007. 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.
November 19, 2007. 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 References 3704345 System using digital filter for waveform or speech synthesis Patent #: 4344148 InventorAssigneeApplicationNo. 122804 filed on 11/19/1987US Classes:704/260Image to speechExaminersPrimary: Wong, Peter S.Assistant: Jones, Judson H. Attorney, Agent or FirmInternational ClassG10L 005/02AbstractCoded text is converted to phonetic data to drive a synthesis filter. Accent data are also obtained to derive a pitch contour for a variable pitch excitation source. Recognition of the beginning of a paragraph causes a pitch contour of higher pitch than the pitch at a later part of the paragraph. The initial pitch falls following each subgroup into which phrases are divided. Accents within a phrase are assigned pitch values which are high for the first accent, less high for the last; and the remainder alternate between higher and lower lesser values. Accents on repeated words may be suppressed.Other References
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