Systems, devices, and methods utilizing a wideband bandstop filter
AssigneeThe MITRE Corporation
InventorBrandt James Lomen
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Abstract
Systems and methods for attenuating one or more unwanted frequency components are disclosed. The system may be configured to receive signals having different frequency components, but the signals may comprise one or more unwanted frequency components. The bandstop filter may be tuned to selectively attenuate the one or more unwanted frequency components while allowing the system to receive other frequency components that are not attenuated. In some embodiments, the bandstop filter comprises a bandpass filter, a delay element, and an amplitude adjustor. The bandstop filter may be tuned by adjusting one or more filter parameters of these components.
Claims20
A system comprising:
- a receiver configured to receive a signal comprising an unwanted frequency component;
- a tunable bandstop filter configured to attenuate an unwanted frequency component of an input signal to the tunable bandstop filter, the tunable bandstop filter comprising:
- a bandpass filter configured to output a bandpass signal by:
- attenuating frequencies of a signal input to the bandpass filter below a first frequency threshold, and
- attenuating frequencies of the signal input to the bandpass filter above a second frequency threshold,
- a delay element, and
- an amplitude adjustor;
- and
- one or more processors configured to attenuate the unwanted frequency component of the received signal by:
- determining, based on a delay of the bandpass filter and a frequency of the unwanted frequency component, delay to add by the delay element;
- causing the delay element to add the delay to a signal input to the delay element to generate a delayed signal;
- determining, based on an amplitude of the bandpass signal at the frequency of the unwanted frequency component, an amplitude adjustment;
- and
- causing the amplitude adjustor to modify, by the amplitude adjustment, the amplitude of a signal input to the amplitude adjustor at the frequency of the unwanted frequency component to generate an amplitude-adjusted signal,
- wherein the unwanted frequency component of the received signal is attenuated based on the bandpass signal, the delayed signal, and the amplitude-adjusted signal.
A method for attenuating an unwanted frequency component, comprising:
- receiving a signal comprising the unwanted frequency component;
- outputting a bandpass signal by:
- attenuating frequencies of a first signal to the bandpass filter below a first frequency threshold, and
- attenuating frequencies of the first signal to the bandpass filter above a second frequency threshold;
- determining, based on a delay associated with the outputting of the bandpass signal and a frequency of the unwanted frequency component, a delay to add to a second signal;
- adding the delay to the second signal to generate a delayed signal;
- determining, based on an amplitude of the bandpass signal at the frequency of the unwanted frequency component, an amplitude adjustment;
- modifying, by the amplitude adjustment, the amplitude of a third signal to generate an amplitude-adjusted signal;
- and
- attenuating the frequency of the unwanted frequency component based on the bandpass signal, delayed signal, and amplitude-adjusted signal.
Dependencies are inferred from the claim text.