Digital speech synthesizer having an analog delay line vocal...

Details Digital speech synthesizer having an analog delay line vocal... Digital speech synthesizer having an analog delay line vocal...

G - Physics

10

L

354/47

G10L 1/08 (1980.01)

Patent

CA 1134042

DIGITAL SPEECH SYNTHESIZER HAVING AN ANALOG DELAY LINE VOCAL TRACT ABSTRACT OF THE DISCLOSURE A phoneme based speech synthesizer that utilizes an analog delay line (ADL) vocal tract which simulates the variations in the acoustical characteristics of the human vocal tract which occur as a result of changes in the cross-sectional area of the human vocal tract at different points along its length. The ADL vocal tract comprises a plurality of T-sections having a resistor as the series component and frequency dependent negative re- sistance (FDNR) as the shunt component. Both the series and shunt components are readily tunable via electrical control signals, although in the preferred embodiment only the series resistive elements are tuned. Except for the vocal excitation source, the ADL vocal tract is driven entirely by digital circuitry, including novel digital transition circuitry for producing gradual variations in the values of the control signals as they change from phoneme to phoneme.

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