Scrambling a compression-coded signal
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United States of America Patent
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Issued Date -
Aug 18, 2005
app pub date -
Apr 12, 2005
filing date -
Oct 1, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This invention provides methods and apparatus for protecting data transmitted using standard compression techniques such as Huffman coding. After input data is preprocessed (filtered, quantized, etc.), the data is encoded using a Huffman coder based on Huffman codes or code books which have been scrambled to change the order of the code books and/or codes from established standard Huffman code books and/or codes. When the transmitted information is received by a Huffman code receiver, the received data may be decoded using the scrambled Huffman code book/codes to obtain the data that was transmitted by the transmitter.
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