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Method of ingress noise reduction in calbe return paths

  • US 5,881,362 A
  • Filed: 09/05/1996
  • Issued: 03/09/1999
  • Est. Priority Date: 11/30/1994
  • Status: Expired due to Term
First Claim
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1. A method for reducing effects of ingress noise signals in a cable return system from a subscriber location to a central station, said return system having a common transmission path for first and second sub-bands of a return frequency band and wiring at said subscriber location having a tendency to pick up ingress signals extending in frequency through both sub-bands of said return frequency band, said method comprising the steps of:

  • receiving first communications signals from a first source through subscriber location wiring for transmission over said common transmission path within a portion of said first sub-band;

    receiving second communications signals from a second source for transmission over said common transmission path within said second sub-band;

    attenuating substantially all signal energy received from said subscriber location wiring in said second sub-band;

    controlling the amount of bandwidth assigned to the first and second sub-bands of the return frequency band; and

    thereafter combining signals from both said first and said second sources for transmission over said common transmission path, substantially eliminating adverse effects of ingress signals from said subscriber location wiring upon communications signals from said second source transmitted over said common transmission path;

    wherein said return frequency band consists of said first and second sub-bands.

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