Digital audio scrambling system with pulse amplitude modulation

Cryptography – Cryptanalysis

Patent

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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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CCIR, "Transmission of Sound and Picture Signals By Time-Division Multiplex", CCIR Doc. CMTT/187-E, Mar. 3, 1977.

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