Title:
mビット情報ワードのシーケンスから変調信号への変換
Document Type and Number:
Japanese Patent JP3935217
Kind Code:
B2
Abstract:
A sequence of m-bit information words is converted to a modulated signal wherein each received information word from the sequence is converted to an n-bit code word. The code word is selected from a set of codewords that depends on a coding state that is related to a digital sum value at the end of the part of the modulated signal that corresponds to the delivered code word. By at least one of the digital sum values, a first (S2, S4, S6, S8, S10, S12) or a second (S3, S5, S7, S9, S11, S13) coding state of a pair of coding states is determined. Which of the two coding states of the pair is determined depends on the information word that corresponds to the previously delivered code word. The sets (V2/V3; V4/V5; V6/V7; V8/V9; V10/V11; V12/V13) of codewords belonging to the pairs of coding states contain no codewords in common. In this coding method the number of consecutive bit cells in the modulated signal having the same signal value does not exceed 7, and specific sync words are required for insertion between blocks of the codewords. The modulated signal obtained may be reconverted to information words by assigning an information word to each of the codewords from the sequence in dependence on the code word to be converted and also in dependence on the logical values of bits in the bit string which are positioned at predefined positions relative to the code word.
Inventors:
Arts Petras Henricus Marie
Application Number:
JP51914198A
Publication Date:
June 20, 2007
Filing Date:
September 12, 1997
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
H03M7/14; G11B20/10; G11B20/14; G11B27/30; H03M5/14; H03M7/20; H04L7/04
Domestic Patent References:
| JP1181330A | ||||
| JP10074365A | ||||
| JP63260226A |
Foreign References:
| WO1995027284A1 |
Attorney, Agent or Firm:
Susumu Tsugaru
Masao Sawada
Masao Sawada