Low voltage speech synthesis system with pulse width digital-to-

Details Low voltage speech synthesis system with pulse width digital-to- Low voltage speech synthesis system with pulse width digital-to-

1980-02-04

1982-11-02

Nusbaum, Mark E.

G10L 100

Patent

active

043574890

ABSTRACT:
Integrated circuit speech synthesis system utilizing complementary metal-insulator-semiconductor technology to achieve low voltage operation, wherein a pluse width modulated digital-to-analog converter is employed to provide for accurate conversion of digital signals into analog signals even though the low voltage operation prohibits the large voltage swings normally required for digital-to-analog converter circuitry. The speech synthesis system includes a linear predictive filter as a speech synthesizer which utilizes coded reflection coefficients to produce digital signals representative of human speech. A microprocessor controls the access of digitized speech data which is stored in a memory. The speech synthesizer and microprocessor along with the pulse width modulated digital-to-analog converter are implemented in complementary metal-insulator-semiconductor technology. The system also includes a speaker for generating audible sounds in the form of synthesized human speech from the analog signals provided by the digital-to-analog converter.

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Smith, S., "Single-Chip Speech Synthesizers", Computer Design, Nov., 1978, pp. 188, 190, 192.

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