Title:
INFORMATION CONVERSION DEVICE AND ENCODING DEVICE
Document Type and Number:
Japanese Patent JP3613689
Kind Code:
B2
Abstract:
PURPOSE: To obtain a high frequency pilot signal close to an encoding period by performing encoding based on a charge value in code word further finely viewing a CDS provided in the code word and known CDS information and forming the code word not propagating to next encoding.
CONSTITUTION: A random 16 bits digital signal is inputted to an I-NRZI encoder 3, and an output two bits of a CDS control signal generation circuit 2 is added to the MSB side of the information to be made 18 bits parallel. Four kinds of signals whose CDS values are different from each other are formed by the encoder 3. A charge in the code word is controlled in the period 60 of the pilot signal and GCM 6 bits, and charge values are detected by detection circuits 4. Further, a rate of six stages is formed in the period by a SET CLK to the circuit 2, and the correspondence to the charge values depend on the LCM of 18 and 60. The error of the charge values is detected by circuits 6, and the absolute value sum ΔCDS of the error is imparted to a minimum value holding circuit 7, and top two bits obtaining the minimum value are returned to the encoder 3, and a switch is shifted and modulated. It is inputted to a parallel/serial conversion circuit 8 and outputted to a transmission circuit in series.
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Inventors:
Kenji Maeno
Kihei Ido
Hideaki Kosaka
Kihei Ido
Hideaki Kosaka
Application Number:
JP15901094A
Publication Date:
January 26, 2005
Filing Date:
July 11, 1994
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G11B20/14; H03M7/14; (IPC1-7): G11B20/14; H03M7/14
Domestic Patent References:
| JP1317280A | ||||
| JP4302224A | ||||
| JP6236538A |
Attorney, Agent or Firm:
Nobuo Kono