发明授权
- 专利标题: Digital modulation apparatus, a digital modulation method, and a recording medium therefor
- 专利标题(中): 数字调制装置,数字调制方法及其记录介质
-
申请号: US764024申请日: 1996-12-11
-
公开(公告)号: US5917857A公开(公告)日: 1999-06-29
- 发明人: Shin-ichi Tanaka , Toshiyuki Shimada , Tadashi Kojima , Koichi Hirayama , Yoshiaki Moriyama , Fumihiko Yokogawa , Takao Arai , Toshifumi Takeuchi
- 申请人: Shin-ichi Tanaka , Toshiyuki Shimada , Tadashi Kojima , Koichi Hirayama , Yoshiaki Moriyama , Fumihiko Yokogawa , Takao Arai , Toshifumi Takeuchi
- 申请人地址: JPX Osaka JPX Kanagawa JPX Tokyo JPX Tokyo
- 专利权人: Matsushita Electric Industrial Co., Ltd.,Kabushiki Kaisha Toshiba,Pioneer Electronic Corporation,Hitachi, Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.,Kabushiki Kaisha Toshiba,Pioneer Electronic Corporation,Hitachi, Ltd.
- 当前专利权人地址: JPX Osaka JPX Kanagawa JPX Tokyo JPX Tokyo
- 优先权: JPX7-324169 19951213
- 主分类号: G11B20/14
- IPC分类号: G11B20/14 ; H03M5/14 ; H03M7/14 ; H04L25/49 ; H04B14/04 ; H03M7/00
摘要:
A digital modulation apparatus applies a method for converting data words to runlength-limited code words using plural conversion tables. The data words are converted to code words that significantly suppress the low frequency component of the final nonreturn-to-zero inverted signal.This digital modulation apparatus includes ROM tables for storing plural conversion tables containing the runlength-limited code words corresponding to the data words; end-runlength memories and evaluators for determining whether the runlength-limit constraints are satisfied in the interconnection between two consecutive code words when the data words to be converted are supplied; and a DSV controller for storing each of the code words that can be selected from two conversion tables to buffer memories when the runlength-limit constraints are satisfied, and selecting the code words wit the greatest effect suppressing the low frequency component in the obtained signal when the code words are NRZI converted.
公开/授权文献
- US4604338A Positively charged colored toner compositions 公开/授权日:1986-08-05