Ingress cancellation is a method for removing narrowband noise from an electromagnetic signal using a digital filter.
[1] This type of filter is used on hybrid fiber-coaxial broadband networks.
[2][3] If a carrier appears in the middle of the upstream data signal, ingress cancellation can remove the interfering carrier without causing packet loss.
[citation needed] Ingress cancellation also removes one or more carriers that are higher in amplitude than the data signal.
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