SIGNAL INTERFACE FOR TWO-DIRECTIONAL COMMUNICATION UNIT

Title:

SIGNAL INTERFACE FOR TWO-DIRECTIONAL COMMUNICATION UNIT

Document Type and Number:

Japanese Patent JP2001359068

Kind Code:

A

Abstract:

To provide a signal interface that supports two-way communication in a signal transmission system.

The signal interface is used in a set-top box of a CATV/ communication system. A diplexer (76) of this interface is placed between an input/output (78) of the set-top box and a signal splitter (66). By placing the diplexer (76) in front of the signal splitter (66), attenuation of a return data channel(RDC) signal can be avoided. Thus, the set-top box can use a return data channel amplifier with a comparatively low gain. Furthermore, since the signal splitter (66) has only to be operated for a frequency bandwidth of a video signal without the need for the operation at a synthesis frequency bandwidth between the video signal and the return data channel signal, the signal splitter (66) can be operated within a comparatively narrow frequency range.

Inventors:

FLICKNER ANDREW KENT
MCREYNOLDS KEVIN PAUL
RHODES ROBERT ANDREW

Application Number:

JP2001105351A

Publication Date:

December 26, 2001

Filing Date:

April 04, 2001

Export Citation:

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Assignee:

THOMSON LICENSING SA

International Classes:

H04N7/10; H04N7/173; (IPC1-7): H04N7/16

Attorney, Agent or Firm:

Katsunori Watanabe

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