System and method for detecting valid indicator signals
AssigneeConexant Systems, Inc.
InventorsJerome Vialle, Patrick Ryan, Michael Whitfield
Life of this patent
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Abstract
Disclosed are systems and methods for signal detection. In one embodiment, a method is provided for detecting a signal. In this respect, the method comprises the steps of determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band; and, comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band.
Claims32
A signal detection method, comprising:
- determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
- comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band;
- and
- indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time.
A program embodied in a machine readable medium, the program comprising:
- at least one statement for determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
- at least one statement for comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band;
- and
- at least one statement for indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time.
A system for signal detection, comprising:
- means for determining a normalized measure of a first power within a first frequency band relative to a second power within a second frequency band of an input signal in a network gateway, wherein the first frequency band is within the second frequency band;
- means for comparing the normalized measure of the first power with a predefined power threshold to detect a presence of an anticipated signal in the first frequency band;
- and
- means for indicating a detection of the anticipated signal after the normalized measure of the first power is at least as great as the predefined power threshold for a period of time.
A system for signal detection, comprising:
- an automatic gain controller adapted to normalize a signal power of an input signal across a predefined frequency spectrum;
- a narrowband filter coupled to the automatic gain controller, the narrowband filter being configured to isolate a predefined frequency band of the input signal, wherein an anticipated signal is transmitted in the predefined frequency band;
- a power estimator coupled to the narrowband filter for estimating the power within the predefined frequency band;
- and
- a first logical circuit for comparing the power estimated within the predefined frequency band with a predefined power threshold to detect a presence of the anticipated signal;
- and
- a second logical circuit for indicating a detection of the anticipated signal after the power estimated within the predefined frequency band is at least as great as the predefined power threshold for a period of time.
A system for signal detection, comprising:
- a first estimator adapted to estimate a signal power of an input signal across an input signal frequency band;
- a narrowband filter coupled to the first estimator, the narrowband filter being configured to isolate a predefined frequency band within the input signal frequency band, wherein an anticipated signal is transmitted in the predefined frequency band;
- a second estimator adapted to estimate a second power within the predefined frequency band;
- a first logical circuit to compare a ratio of the second power to the signal power with a predefined ratio threshold;
- and
- a second logical circuit for indicating a detection of the anticipated signal after the ratio is at least as great as the predefined ratio threshold for a period of time.
Dependencies are inferred from the claim text.