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Method of and device for synthesis of speech from printed text

  • US 4,278,838 A
  • Filed: 08/02/1979
  • Issued: 07/14/1981
  • Est. Priority Date: 09/08/1976
  • Status: Expired due to Term
First Claim
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1. A method for synthesizing speech, comprising the steps of:

  • analyzing a printed text grammatically and phonetically for sequences of phonemes, for the placement of accents, for the placement and duration of pauses and intonations to form frequency magnitude and amplitude characteristics of a sentence to be synthesized;

    reading out from a read-only memory, according to said frequency magnitude characteristics, binary signals coding at least in part successive magnitudes of voice-frequency functions;

    converting said binary signals at the output of said read-only memory into an analog signal;

    modulating said analog signal according to said amplitude characteristics;

    introducing quasirandom changes in said frequency magnitude and amplitude characteristics to facilitate the production of natural-sounding speech, the quasirandom changes introduced in said frequency magnitude and amplitude characteristics being within the limits of ±

    3% for the frequency and ±

    30% for the amplitude; and

    feeding the modulated analog signal to the loudspeaker.

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