Cryptography – Cryptanalysis
Patent
1987-11-05
1989-01-17
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 31, 380 38, 380 39, H04K 104
Patent
active
047992573
ABSTRACT:
A wireless transmitter for PM (phase modulation) signal with a spectrum scrambler for relocation of input spectrum for privacy purposes is comprised of a differential circuit coupled with an input terminal, a spectrum scrambler coupled with output of said differential circuit, and FM (frequency modulation) modulator coupled with output of the spectrum scrambler. Due to the position of the differential circuit before the spectrum scrambler, modulation index of modulated PM signal and/or the frequency band of the modulated PM signal does not increase irrespective of spectrum scrambling.
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"Automated Maritime Telephone System" by Komura et al., Japan Telecommunications Review, 10/77, pp. 304-312.
Kanmuri Noboru
Kishi Masahichi
Seki Seizo
Cangialosi Salvatore
Nippon Telegraph & Telephone Public Corporation
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