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Speech information transmission method and system

  • US 4,473,904 A
  • Filed: 03/29/1982
  • Issued: 09/25/1984
  • Est. Priority Date: 12/11/1978
  • Status: Expired due to Term
First Claim
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1. An apparatus for transmitting speech information through a Telex system, comprising:

  • (a) speech input conversion means for converting an analog speech signal to be transmitted into a corresponding digital speech signal;

    (b) speech extracting and compressing means for preparing a character code train of a low bit rate by extracting at least one of syllable units and phonetic symbols from said digital speech signal and compressing the extracted syllable units or phonetic symbols, and for determining accent types of words or phrases contained in said character code train to produce an accent identifying code;

    (c) Telex coding means for converting the character code train of the low bit rate and said accent identifying code into a Telex code signal;

    (d) channel means for transmitting the Telex code signal;

    (e) code conversion means for converting said transmitted telex code signal into a corresponding signal train of the syllable units or phonetic symbols and an accent type identifying signal; and

    (f) speech information decoding means for decoding said signal train and said accent type identifying signal from the output of said code conversion means to synthesize voice speech to thereby reproduce the information of the speech signal,wherein said extracting and compressing means (b) includes a circuit for extracting partial autocorrelation coefficients (PARCOR) and pitch frequency for the input speech signal, a DP matching circuit for determining phoneme information on the basis of the PARCOR signal, and an operation controller circuit adapted to execute processing for converting said phoneme information signal into a syllable series signal and determining the accent type from the pitch frequency series, said code conversion means (e) includes a controller for identifying the character code train from the incoming telex code signal transmitted through said channel and converting the character code train into a time series signal of the syllable units or phonetic symbols, and said speech information decoding means (f) includes a pitch pattern memory for previously storing standard pitch patterns for speech characters and producing corresponding pitch pattern information in response to the incoming character code train, a speech synthesizer including a speech element memory for previously storing predetermined waveforms of speech elements and adapted to respond to said time series signal from said controller means to thereby produce a speech signal of the syllable units or phonetic symbols in the form of a time series of the speech elements each of which corresponds to a pitch unit, whereby said speech element memory is controlled by said pitch pattern information output from said pitch pattern memory to produce a speech waveform signal having a duration determined by said pitch pattern information, and means for converting the speech waveform signal output from said speech synthesizer to a speech signal.

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