Noise reduction in signal transmission system over building power distribution wiring
Patent 4745392 Issued on May 17, 1988. Estimated Expiration Date: 
May 17, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 17, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3523278 3855575 3879665 Detector to determine the presence of an electrical signal in the presence of noise of predetermined characteristics Method for transmitting binary signals over a foreign wiring network Radio frequency detection circuitry having noise discrimination capability Method for communication utilizing multi-mode reception Patent #: 4559520 InventorsApplicationNo. 06/436931 filed on 10/27/1982US Classes:375/285, Antinoise or distortion340/310.13, Noise reduction (e.g., filtering)375/346Interference or noise reductionExaminersPrimary: Caldwell, Sr., John W.Assistant: Queen, Tyrone Attorney, Agent or FirmInternational ClassesH04B 3/54 (20060101)H02J 13/00 (20060101) AbstractA signal transmission system over building or house wiring includes noise reduction circuit to reduce noise including asynchronous noise and synchronous noise. Received pulses are sampled in a given interval and the number of continous pulses in question during the sampling interval is counted. The pulses in question are ignored as noise if the number of pulse counting is less than a predetermined reference count and the pulses are treated as true signals if the number is more than said reference count.Other References
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