| US 7,333,608 B2 | ||
| Analog scrambler | ||
| Jack Elias Seitner, Doylestown, Pa. (US) | ||
| Assigned to Lockheed Martin Corporation, Bethesda, Md. (US) | ||
| Filed on Jun. 15, 2005, as Appl. No. 11/152,113. | ||
| Application 11/152113 is a continuation of application No. 10/080560, filed on Feb. 25, 2002, granted, now 6,973,188. | ||
| Prior Publication US 2005/0231402 A1, Oct. 20, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04B 1/68 (2006.01); H04L 9/00 (2006.01); H04K 1/04 (2006.01) | ||
| U.S. Cl. 380—38 [380/44; 455/203] | 10 Claims |
| 1. An analog signal scrambler, comprising:
a receiver for receiving an analog signal and converting the analog signal into an intermediate frequency signal;
a generator for generating a pseudo-random gaussian frequency distribution signal; and
a frequency converter for multiplying the intermediate frequency signal and the pseudo-random gaussian frequency distribution
signal, thereby scrambling the analog signal,
wherein said generator comprises:
a pseudo-random noise generator for generating a pseudo-random noise signal based on a password,
a filter for filtering the pseudo-random noise signal, and
a converter for converting the filtered pseudo-random noise signal into the pseudo-random gaussian frequency distribution
signal.
|