Digital audio scrambling system with pulse amplitude modulation
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United States of America Patent
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-
Jun 21, 1988
Issued Date -
N/A
app pub date -
Aug 11, 1986
filing date -
May 27, 1983
priority date (Note) -
Expired
status (Latency Note)
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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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