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US 9,807,467 B2Granted
Upstream noise suppression circuits and related radio frequency subscriber drop equipment and methods
AssigneeCommScope, Inc.
InventorMark E. Alrutz
Life of this patent
Estimating the term…
Abstract
Upstream noise suppression circuits include a splitter and a combiner that are connected by first and second communications paths. An information signal removal circuit is provided on the second communications path and is configured to remove an upstream information signal therefrom. A phase shifter is also provided on the second communications path between the upstream information signal removal circuit and the combiner.
Claims15
An upstream noise suppression circuit, comprising:
- a radio frequency (“RF”) splitter having an input port, a first output port and a second output port;
- an RF combiner having a first input port that is coupled to the first output port of the RF splitter, a second input port that is coupled to the second output of the RF splitter, and an output port;
- an information signal removal circuit that is coupled between the second output of the RF splitter and the second input port of the RF combiner, the information signal removal circuit configured to selectively remove an upstream information signal from the second communications path and including a burst detector that is configured to detect the upstream information signal and a delay circuit that delays the upstream information signal by a predetermined amount of time;
- and
- a phase shifter that is coupled between an output of the upstream information signal removal circuit and the second input of the RF combiner,
- wherein the connection between the first output port of the RF splitter and the first input port of the RF combiner comprises a first communications path, and the connection between the second output port of the RF splitter and the second input port of the RF combiner comprises a second communications path.
3 more elements
An upstream noise suppression circuit, comprising:
- an RF splitter having an input port, a first output port and a second output port;
- an RF combiner having a first input port that is coupled to the first output port of the RF splitter, a second input port that is coupled to the second output of the RF splitter, and an output port, where the connection between the first output port of the RF splitter and the first input port of the RF combiner comprises a first communications path, and the connection between the second output port of the RF splitter and the second input port of the RF combiner comprises a second communications path;
- and
- a selective phase shifter circuit that is coupled between the second output of the RF splitter and the second input of the RF combiner, the selective phase shifter circuit configured to selectively phase shift a signal on the second communications path and including a burst detector that is configured to detect the presence of an upstream information signal that is contained within the signal on the second communications path;
- wherein the selective phase shifter circuit phase shifts the signal on the second communications path by approximately 180 degrees in response to the burst detector not detecting the presence of the upstream information signal;
- and
- wherein the selective phase shifter circuit passes the signal on the second communications path without phase shifting the signal in response to the burst detector detecting the presence of the upstream information signal.
4 more elements
Dependencies are inferred from the claim text.