Integrated circuit phoneme-based speech synthesizer

Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices – Loudspeaker operation

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G10L 100

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044332106

ABSTRACT:
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 controlled 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.

REFERENCES:
patent: 3836717 (1974-09-01), Gagnon
patent: 3908085 (1975-09-01), Gagnon
patent: 4031369 (1977-06-01), Heaman et al.
patent: 4128737 (1976-08-01), Dorais
patent: 4130730 (1977-09-01), Ostrowski
B. J. White and D. A. Hodges, "Electronics", Feb. 15, 1979.
David J. Allstot, Robert W. Brodersen and Paul R. Gray, "ISSCC Digest of Technical Papers", Feb. 14, 1979, vol. 22.
Robert W. Brodersen, Paul R. Gray, and David A. Hodges, "MOS Switched-Capacitor Filters", Jan. 1979, from Proceedings of the IEEE.
Ser. No. 952,792, filed Oct. 19, 1978, Richard T. Gagnon.

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