Speech generation using variable frequency oscillators
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Aug 13, 1990
filing date -
Aug 13, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Artificial speech is produced with minimized memory requirements by using a bank of digital oscillators to produce voiced sounds by combining multiple harmonies of a fundamental-frequency sine wave, and using only one of these oscillators to reproduce stored nonsinusoidal waveforms for unvoiced sounds. Sufficient dynamic range is achieved with a minimum number of oscillators by generating only every other harmonic at the higher frequencies. All harmonics are derived from a single stored digitized sine wave by using stored sets of skip counts and amplitude codes corresponding to various voiced sounds to be produced.
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