Title:
デジタル伝送装置及びデジタル伝送状況把握方法
Document Type and Number:
Japanese Patent JP4414825
Kind Code:
B2
Abstract:
To provide a digital transmission system capable of monitoring the reception status of a relay point on the way at the final point even in the case of two-stage relay transmission.
In the system, a display data transmitter 20 comprising a memory is provided in a relay part of a point B, and a display data receiver 2 similarly comprising a memory is also provided in a point C. At such a time, both the display data transmitter 20 and the display data receiver 21 comprise the memories and use data transmission between the memories, so that data required for constellation display can be transmitted from the point B to the point C via a low-speed line M such as a telephone line.
COPYRIGHT: (C)2005,JPO&NCIPI
Inventors:
Atsushi Miyashita
Application Number:
JP2004197016A
Publication Date:
February 10, 2010
Filing Date:
July 02, 2004
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H04N17/00; H04B7/15; H04L69/40; H04N5/00
Domestic Patent References:
| JP2002223459A | ||||
| JP200294481A | ||||
| JP2001339743A | ||||
| JP2000349731A | ||||
| JP7221809A | ||||
| JP10322401A | ||||
| JP2002171243A | ||||
| JP2001285376A | ||||
| JP2222345A |
Foreign References:
| WO2003036895A1 |
Attorney, Agent or Firm:
Kenjiro Take