Ingress cancellation

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. Ingress cancellation eventually will break if the in-channel ingress gets too high.^{[citation needed]}