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Analog signal scrambling system

  • US 4,379,205 A
  • Filed: 06/22/1979
  • Issued: 04/05/1983
  • Est. Priority Date: 06/22/1979
  • Status: Expired due to Term
First Claim
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1. Scrambling apparatus for converting digital samples of an analog signal having a prescribed bandwidth into a scrambled analog signal for application to a channel having a bandwidth no greater than that needed for the original signal, comprising:

  • means for forming a first vector α

    of discrete prolate spheroidal sequence coefficient signals from said digital samples of said analog signal,means responsive to said signals formed by said first means for rearranging said first vector of signals into a scrambled vector β

    of discrete prolate spheroidal sequence coefficient signals,means responsive to said output rearranging means for reforming said scrambled vector of discrete prolate spheroidal sequence coefficient signals to output scrambled digital signal samples (Bn) for transmission, andmeans for applying said output scrambled digital signal samples as an analog signal to said channel.

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