Filter circuit receiving upstream signals for use in a CATV network
First Claim
1. For use in a CATV network, an upstream filter circuit comprising at least one bandpass filter for receiving an upstream signal, an electronic switch connected to the output of said at least one bandpass filter for applying a filtered upstream signal from said at least one bandpass filter to an upstream line, means for detecting the energy level of said filtered upstream signal at a point between said at least one bandpass filter and said electronic switch, and means for enabling the electronic switch to close in the event said energy level is above a predetermined threshold.
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Abstract
A two-way CATV network which in the preferred embodiment uses gating upstream narrowband filters in the distribution lines and/or trunks to substantially reduce upstream noise gathering. The filters sense the upstream signal energy and open in the event the energy exceeds a predetermined threshold.
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Citations
18 Claims
- 1. For use in a CATV network, an upstream filter circuit comprising at least one bandpass filter for receiving an upstream signal, an electronic switch connected to the output of said at least one bandpass filter for applying a filtered upstream signal from said at least one bandpass filter to an upstream line, means for detecting the energy level of said filtered upstream signal at a point between said at least one bandpass filter and said electronic switch, and means for enabling the electronic switch to close in the event said energy level is above a predetermined threshold.
Specification