Communication system using leakage transmission line

• US 20040041726A1
• Filed: 05/19/2003
• Published: 03/04/2004
• Est. Priority Date: 09/19/2001
• Status: Abandoned Application

• Current Assignee: Central Japan Railway Company, Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Central Japan Railway Company, Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kawakami, Takashi, Fukae, Tadamasa, Tamiya, Norihiro, Morihara, Kenji
• Application Number:
  US10/432,049
• Publication Number:
  US 20040041726A1
• Time in Patent Office: Days
• US Class Current: 342/28
• CPC Class Codes: H04B 5/0018 using leaky or radiating cables, e.g. leaky coaxial cables or power lines for inductive transmission leaky cables per se H01Q13/20; for railways B61L3/22
• CPC Class Codes: H04B 5/28 using the near field of leaky cables, e.g. of leaky coaxial cables

Abstract

A communication system using a leakage transmission path, for sending and receiving signals lying within a passband, which the leakage transmission path essentially has as a conductive line, is provided with a signal generation unit for generating a signal to be transmitted by way of the leakage transmission path, and a relay unit disposed on a way of the leakage transmission path, for relaying the signal from the generation unit, and for converting the signal applied, via a cable, thereto into a signal lying within the passband, which the leakage transmission path essentially has, so as to send out it.

Claims

1. A communication system using a leakage transmission path, for sending and receiving signals lying within a passband, which a leakage transmission path essentially has as a conductive line, said system comprising:

a signal generation means for generating a signal to be transmitted by way of the leakage transmission path; and

a relay means disposed on a way of the leakage transmission path, for relaying the signal from said generation means, and for converting the signal applied, via a cable, thereto into a signal lying within the passband, which the leakage transmission path essentially has, so as to send out it.

2. The communication system using a leakage transmission path, according to claim 1, wherein said signal generation means is an imaging device for generating a video signal.

3. The communication system using a leakage transmission path, according to claim 1, wherein said signal generation means generates signals respectively lying within a plurality of frequency bands and said relay means converts those signals respectively lying within the plurality of frequency bands into signals so that they have frequencies that are separately arranged in the passband which the leakage transmission path has.

4. A system using a leakage transmission path for transmission of signals and having a plurality of communication systems including a communication system using the leakage transmission path, for sending and receiving signals lying within a passband, which the leakage transmission path essentially has as a conductive line, said plurality of communication systems generating and transmitting signals respectively lying within different frequency bands, wherein said communication system comprises a signal generation means for generating a signal to be transmitted by way of the leakage transmission path and a relay means disposed on a way of the leakage transmission path, for relaying the signal from said generation means, and for converting the signal applied, via a cable, thereto into a signal lying within the passband, which the leakage transmission path essentially has, so as to send out it, and each of said plurality of communication systems except said communication system includes a relay means for relaying signals transmitted via the leakage transmission path.

5. The system according to claim 4, wherein said relay means included in each of said plurality of communication systems separates or combines a signal lying within a frequency band which each of said plurality of communication systems uses from or with a signal transmitted via the leakage transmission path.