Cryptography – Cryptanalysis
Patent
1986-08-11
1988-06-21
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 28, H04L 900
Patent
active
047529539
ABSTRACT:
In a system for scrambling an audio signal for transmission with a video signal having non-video information intervals, an analog audio signal is converted into a scrambled compressed digital audio signal; individual bits from the scrambled compressed digital audio signal are combined to provide 2-bit digital words; each digital word is converted into an 8-bit digital PAM data signal having a binary value bearing a predetermined relationship to the binary value of the converted 2-bit digital word; the 8-bit digital PAM data signal is converted into a 4-level PAM analog signal; and the PAM analog signals are inserted into the non-video information intervals of the video signal for transmission. A descrambling system descrambles the 4-level PAM analog signals by a complementary scheme.
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Heller Jerrold A.
Paik Woo H.
Walker Gordon K.
Cable/Home Communication Corp.
Callan Edward W.
Cangialosi Salvatore
Lewis Aaron J.
M/A-COM Government Systems Inc.
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