Title:
【発明の名称】ディジタル信号変調方式
Document Type and Number:
Japanese Patent JP3011436
Kind Code:
B2
Abstract:
A digital signal modulator modulates an input digital data code to a channel code which has more bits than that of the input data code. The digital signal modulator comprises an NRZI transformer and a modulator. The NRZI transformer NRZI-transforms an input channel code and the modulator then modulates the input data code into a channel code. The modulation is implemented by selection of a channel code so that the DSV converges to zero from two channel codes assigned in advance to each of input data codes. The above two channel codes have different polarities of CDS values after the NRZI transform. The channel code is defined so that the number of '1's in the channel code is odd if a value of the CDS equals zero after the NRZI transform.
Inventors:
Yoshihisa Sakazaki
Application Number:
JP17931990A
Publication Date:
February 21, 2000
Filing Date:
July 06, 1990
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
G11B20/14; H03M5/14; H03M7/14; H04N5/926; (IPC1-7): H03M7/14
Domestic Patent References:
| JP59123343A | ||||
| JP1317280A |
Attorney, Agent or Firm:
Susumu Ito