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Voice scrambler using syllabic masking

  • US 4,133,977 A
  • Filed: 02/25/1977
  • Issued: 01/09/1979
  • Est. Priority Date: 02/25/1977
  • Status: Expired due to Term
First Claim
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1. A method of communicating in secrecy comprising the steps of adding to the intelligence signals to be communicated a masking signal having a frequency that randomly varies between a plurality of discrete frequencies within the bandwidth of the intelligence, mixing the combined signals with a carrier signal having a frequency that randomly varies between a plurality of discrete frequencies, and removing the mask signal by double frequency translation and filtering.

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