公开(公告)号：JPH0529947A

公开(公告)日：1993-02-05

申请号：JP34699091

申请日：1991-12-27

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： I BOMUCHIYORU ,  KIMU JIYONSHIKI ,  BAKU GONCHIYORU

IPC: H03M5/12 ,  H03D13/00 ,  H03M5/06 ,  H03M5/14 ,  H04L7/033 ,  H04L25/49

Abstract: PURPOSE: To stably decode CMI data into NRZ data. CONSTITUTION: Whenever rise transition is generated in CMI data, an inter-pulse transition time interval output part 3 generates a pulse RTP based on a pulse from a clock generation part 1 and data from a data output part 2, and a clock semi-period reference pulse generation part 4 generates a pulse RR0. Then, a rise transition detection/two stage semi-period shift part 5 outputs pulses RR1 and RR2. When descending transition is generated in CMI data, a pulse FTP is outputted from the pulse transition time interval output part 3 and a descending transition detection/three stage semi-period shift part 6 outputs pulses FR0, FR1, FR1 and FR2. A CMA/NRZ decoding part 7 decodes data into NRZ data and a code error detection part 8 detects whether a CMI code error occurs or not in CMI data.