Method and apparatus, demodulating method and signal demodulatin

Details Method and apparatus, demodulating method and signal demodulatin Method and apparatus, demodulating method and signal demodulatin

1996-07-26

1999-02-09

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 59, H03M 746

Patent

active

058700374

ABSTRACT:
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.

REFERENCES:
E-mail transmission received by inventors dated Feb. 24, 1994, not published.

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