Formant-based speech synthesizer

Details Formant-based speech synthesizer Formant-based speech synthesizer

1982-12-08

1986-04-29

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

G10L 100

Patent

active

045861935

ABSTRACT:
A formant-based multi-path speech synthesizer is reconfigurable to use common elements for different types of sounds. A pitch generator or a noise generator is connected to a glottal signal path for vowel or aspirate sound, respectively. The pole and zero filters normally part of the fricative signal path which produces fricative or stop sounds are used in the glottal signal path for nasal sounds. The output of a spectral filter in the glottal signal path bypasses the cascaded formant filters and is connected directly to the glottal path attenuator for voice bar sounds. The output of the first formant filter is rectified and modulates the noise signal in the fricative path and the glottal and fricative signal paths are summed for voiced fricative sounds. To minimize spectral tilt, the third and fourth formant filters and the pole filter are peak filters. The glottal path attenuator is at the end of the glottal signal path to maximize the signal-to-noise ratio.

REFERENCES:
Flanagan, Speech Analysis Synthesis and Perception, Springer-Verlag, 1972, pp. 42, 340, 342.
B. Gold and L. R. Rabiner, "Analysis of Digital and Analog Formant Synthesizers", IEEE Trans. Audio and Elect., AU-16, (1), pp. 81-94, Mar. 1968.
L. R. Rabiner, "Digital-Formant Synthesizer for Speech Synthesis Studies", J. Acoust. Soc. Am., vol. 43, No. 4, pp. 822-828, 1968.
L. R. Rabiner et al., "A Hardware Realization of a Digital Formant Speech Synthesizer", IEEE Trans. Comm. Tech., vol. COM-19, No. 6, pp. 1016-1020, Dec. 1971.
D. H. Klatt, "Software for a Cascade/Parallel Formant Synthesizer", J. Acoust. Soc. Am., vol. 65, No. 3, pp. 971-995, Mar. 1980.
L. McCready et al., "A Monolithic Formant-Based Speech Synthesizer", Proc. 1981 Int. Symp. Circuits and Systems, pp. 986-988.

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