Method and device for storing main information with associated additional information incorporated therein
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United States of America Patent
Stats
-
Mar 27, 2001
Grant Date -
N/A
app pub date -
Jun 25, 1997
filing date -
Jul 2, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To store main information with associated additional information incorporated therein, data constituting the additional information is divided into a plurality of small-size data pieces of, e.g., one bit. Then, the respective values of particular ones of predetermined data units (e.g., bytes) constituting the main information are subjected to arithmetic operations in accordance with a predetermined algorithm containing the value of each of the data pieces as a parameter. In this way, the respective values of the particular data units in the main information are modulated in accordance with the values of the individual data pieces in the additional information; at that time, only some of the data unit values are altered with the others left unaltered. For reproduction of the additional information, the stored main information is read out, and the individual data pieces are reproduced from the particular data units by inversely executing the algorithm.
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