Error check or erro correction code coding device
AssigneeCanon Kabushiki Kaisha
InventorsAkihiro Shikakura, Tetsuya Shimizu, Motokazu Kashida
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Abstract
An error check or correction code coding device is disclosed. In this device, when a main information code is transmitted after an error check or correction code is added thereto, a control code is included in a code group used in calculations upon generation of the error check or correction code, and a bit pattern of the control code is selected to remove a DC component of the bit pattern of the error check or correction code.
Claims26
An error detection or error correction code coding device comprising:
- (a) calculation means for calculating a redundancy code for detecting or correcting an error from a code group including main information codes and a control code having no correlation with the main information codes;
- and
- (b) selection means for selecting a pattern of the control code from a plurality of patterns, said selection means selecting a pattern which can reduce a DC component of the redundancy code as much as possible.
An error detection or error correction code coding device comprising:
- (a) calculation means for calculating a redundancy code for detecting or correcting an error from a code group including main information codes and a control code having no correlation with the main information codes;
- (b) detection means for detecting a low-frequency component of the redundancy code;
- and
- (c) determination means for determining a pattern of the control code in accordance with an output from said detection means.
An error detection or error correction code coding device comprising:
- (a) calculation means for calculating a redundancy code for detecting or correcting an error from a code group including main information codes and control code having no correlation with the main information codes;
- (b) transmission means for transmitting a code sequence in units of data frames each obtained by adding the redundancy code to the code group;
- (c) detection means for detecting a low-frequency component of a code previously transmitted by said transmission means;
- and
- (d) determination means for determining a pattern of the control code in accordance with an output from said detection means.
Dependencies are inferred from the claim text.