Integrated circuit phoneme-based speech synthesizer

Details Integrated circuit phoneme-based speech synthesizer Integrated circuit phoneme-based speech synthesizer

G - Physics

10

L

354/47

G10L 1/08 (1980.01) G10L 1/00 (1980.01)

Patent

CA 1171179

ABSTRACT OF THE DISCLOSURE A phoneme-based speech synthesizer that is particularly adapted for implementation on a single integrated circuit chip. The vocal tract is comprised of a fixed resonant filter and a plurality of tunable resonant filters whose resonant frequencies are con- trolled in accordance with the values of certain control parameters. The vocal tract is implemented utilizing a capacitive switching technique which eliminates the need for large valued components to achieve the relatively low frequencies of human speech. In addition, a novel digital transition circuit is included which gradually transitions the values of the vocal tract control parameters as they change from phoneme to phoneme. A unique glottal source generator is also disclosed which is adapted to digitally generate a glottal pulse signal in a manner which readily permits the glottal pulse to be spectrally shaped in any desired configuration.

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