Signal modulating method, signal modulating apparatus,...

G - Physics – 11 – B

Patent

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Details

G11B 20/10 (2006.01) G11B 20/14 (2006.01) H03M 5/14 (2006.01) H03M 7/46 (2006.01) H03M 13/09 (2006.01) H03M 13/31 (2006.01)

Patent

CA 2171113

In the present invention, a partly duplexed conversion table is used as a conversion table for converting an M-bit based data string directly into an N-bit based code string without using margin bits. This conversion table is constituted by first and second sub-tables including plural code groups, respectively. The plural code groups include different codes for the same input data. The second sub-table is a table which is partly duplexed with the first sub-table and is produced by allocating different codes to data from first input data to second input data in the first sub-table. The first and second sub-tables are so designed that code sets of the duplexed portions take variants of digital sum variations which are opposite in sign. Codes are allocated to all the code groups in the duplexed portions of the first and second sub-tables with respect to input data sequentially from a code having a maximum absolute value of variant of the digital sum variation. Thus, according to the present invention, low frequency components of modulated signals may be restricted properly.

La présente invention se rapporte à une table de conversion dont une partie est duplexée afin que l'on puisse convertir directement les données d'entrée M bits en un code N bits sans utiliser de bit de marge. Cette table de conversion comprend des première et seconde sous-tables contenant chacune une pluralité de groupes de codes, lesquels contiennent différents codes destinés aux mêmes données d'entrée. Dans la seconde sous-table, une partie de la première sous-table est duplexée par attribution de codes différents aux données comprises entre les premières données d'entrée et les seconde données d'entrée de la sous-table. L'ensemble de codes de la partie duplexée de la table de conversion est constitué de façon à effectuer une variation de total numérique de signes opposés, et des codes sont séquentiellement attribués aux données d'entrée à partir du code ayant la plus grande valeur absolue de variation de total numérique. De cette manière, la présente invention peut supprimer de façon appropriée les composantes basse fréquence des signaux de modulation.

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