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SPEECH SYNTHESIS FROM A SPECTROGRAPHIC TRACE

  • US 3,689,696 A
  • Filed: 01/09/1970
  • Issued: 09/05/1972
  • Est. Priority Date: 01/09/1970
  • Status: Expired due to Term
First Claim
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1. A method of synthesizing an acoustical signal from a spectrograph trace in which component frequency portions of sound are incrementally plotted against time over a predetermined time period with the intensity of the components being represented by varying density of the plots at corresponding frequency-time points, said method comprising the stEps of:

  • scanning said trace successively for said incremental frequency portions over said period and deriving analog signals of amplitude as a function of the density of the plot of the respective frequencies;

    synchronously with the scanning of the trace generating oscillation signals at the respective scanning frequencies during said period and amplitude-modulating said oscillation signals by the analog signals of amplitude to produce amplitude-modulated oscillation signals;

    recording said amplitude-modulated oscillation signals upon a medium in a multiplicity of tracks;

    scanning said medium and generating automatically in response to the scanning of the medium a reproduction of the recorded signals to produce a synthesized acoustic signal corresponding to a summation of the amplitude-modulated signals.

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