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Noise reduction in signal transmission system over building power distribution wiring

  • US 4,745,392 A
  • Filed: 10/27/1982
  • Issued: 05/17/1988
  • Est. Priority Date: 10/26/1982
  • Status: Expired due to Fees
First Claim
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1. A signal transmission system for transmission of signals over building or house wiring, said signals being superimposed over a commercial A.C. supply and representing a signal one as the presence of an A.C. burst signal having a frequency substantially higher than that of said A.C. supply, comprising:

  • means for sampling said signals in a given sampling interval;

    means for level detecting said signal to develop pulses representative of signal ones and of noise above a threshold, each said A.C. burst signal being developed as a series of consecutively appearing pulses;

    means for counting the number of consecutively appearing pulses in said signals during the sampling interval; and

    means for ignoring said pulses in said given interval as noise if the number of pulses counted during said sampling interval by said means for counting is less than a predetermined reference count and for treating the pulses as an authentic signal one if the number of pulses counted is more than said reference count.

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