Patents Assigned to Technical Communications Corp.
  • Secure communication system with improved frequency-hopping arrangement
    Patent number: 4276652
    Abstract: A signal scrambling system of the type in which the frequencies of the information signal band are inverted by heterodyning the information signal with a varying beat frequency. In accordance with the invention the beat frequency varies in a sequence of small increments which, in their totality, provide large overall frequency excursions and which, individually, are sufficiently small to avoid the generation of unduly strong spurious signals within the information signal band.
    Type: Grant
    Filed: October 2, 1978
    Date of Patent: June 30, 1981
    Assignee: Technical Communications Corp.
    Inventors: Arnold M. McCalmont, Matthew W. Slate