Conversionless digital speech production
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United States of America Patent
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-
Feb 14, 1989
Grant Date -
N/A
app pub date -
Nov 18, 1986
filing date -
Nov 18, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Clear speech can be produced on a DAC-less personal computer from an all-software speech-generating program with an unlimited vocabulary by applying to the computer's speaker a square-wave carrier signal of ultrasonic frequency, and varying the duty cycle of the carrier signal in accordance with digitized speech samples to produce an audio signal. The computations necessary to produce the speech samples are so timed by the program that the CPU is free to turn the speaker on and off between computations at precisely the right instant for the correct generation of a carrier having a constant ultrasonic frequency and a duty cycle determined by the value of the speech samples.
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