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Speech privacy system

  • US 3,995,115 A
  • Filed: 08/25/1967
  • Issued: 11/30/1976
  • Est. Priority Date: 08/25/1967
  • Status: Expired due to Term
First Claim
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1. Speech privacy transmitter apparatus comprising:

  • a source of speech signal,means for developing a plurality of reduced bandwidth control signals whose instantaneous magnitudes are proportional to the instantaneous amplitudes of the components, respectively, within each of a plurality of predetermined frequency subbands of said speech signal,means for extracting from said speech signals a signal representative of the baseband components of said speech signal,means for rendering said plurality of reduced bandwidth control signals unintelligible prior to transmission,means for rendering said representative baseband signal unintelligible prior to transmission,and means for transmitting said signals which have been rendered unintelligible.

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