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Communication system for coexistent base band and broad band signals

  • US 5,150,365 A
  • Filed: 07/05/1990
  • Issued: 09/22/1992
  • Est. Priority Date: 11/18/1986
  • Status: Expired due to Fees
First Claim
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1. A communication system comprising:

  • a transmission path;

    a plurality of first terminal units having means for outputting a corresponding base band signal having frequency components within a base band signal rangea plurality of branch filter means, each being provided for an associated one of said first terminal units, each having a first port, a second port, third port, and a low pass filter means, having a predetermined cut-off frequency, connecting said first port to said second port and connecting said third port to said second port, said associated one of the said first terminal units being connected to said second port, for preventing communication to said transmission path of frequency components of said base band signal above said predetermined cut-off frequency outputted from said associated one of said first terminal units, and said branch filter means having a high pass filter means, within said transmission path, having a lower cut-off frequency above said low pas filter cut-off frequency, connecting said first port to said third port for passing a broad band signal, said broad band signal having a range extending upwards from said lower cut-off frequency, through said transmission path from said first port to said third port;

    a plurality of second terminal units each having means for sending out a first modulated signal having a first frequency range and means for receiving a second modulated signal having a second frequency range, said first and second frequency ranges being higher than the cut-off frequency of said lowpass filter means, a part of a lower one of said first and second frequency ranges being overlapped with the higher frequency components of said base band signal cut off by said lowpass filter means; and

    a plurality branch connecting means, each being provided for an associated one of said second terminal units, for connecting said associated one of said second terminal units to said transmission path.

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