公开(公告)号：JPH10178623A

公开(公告)日：1998-06-30

申请号：JP22799697

申请日：1997-08-25

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： KAN TOKI ,  SAI SOSEKI

IPC: H04N7/08 ,  H04H20/00 ,  H04H20/74 ,  H04H60/07 ,  H04H60/15 ,  H04H60/23 ,  H04L9/18 ,  H04L9/36 ,  H04N7/081 ,  H04N7/20 ,  H04H1/00

Abstract: PROBLEM TO BE SOLVED: To reduce costs to acquire stability and reliability by separately providing a circuit which makes a compressed data stream a system packet and a scrambling control circuit to the circuit in accordance with each channel of audio and video and later multiplexing it. SOLUTION: In a channel scrambling part 200, MPEG 2 system packet stream generating parts 210 and 240 generate a system packet for each channel of video and audio. Scramblers 230 and 260 scramble a payload part with a control word of each channel of video and audio as a key. For instance, on the video channel side, when the part 210, a scramble ON/OFF path controller 220, the scrambler 230 are formed in one module, the timing control of a circuit operation is simple and design is easy in each module.

公开(公告)号：JP2000111598A

公开(公告)日：2000-04-21

申请号：JP18715199

申请日：1999-07-01

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： IN ZAIFUUN ,  CHO KOIN ,  SAI SOSEKI

IPC: G01R29/10 ,  G01R29/08 ,  G01R31/00

Abstract: PROBLEM TO BE SOLVED: To provide a linear coupling transmission line cell which eliminates multiple reflection and widens used frequency zone by generating frequency window with large Q. SOLUTION: A line cell has external conductors 4, 5 and 6 provided with a taper part coupled in one on both sides center, connector means 10, 11, 12 and 13, internal conductor, internal conductor support means 17 and 18, and an open/close means where an electromagnetic wave shield window is formed. The internal conductor is placed in internal space so as to be isolated from the external conductors 4, 5 and 6 and constituted of an upper side first internal conductor plate 7 positioning in line with the connector means 10 and 12 and a lower side second internal conductor plate 8 positioning in line with the connectors 11 and 13 and forming a parallel plane facing to the upper first internal conductor plate 7.