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US 8,537,944 B2Granted
Apparatus with a plurality of filters
AssigneeInfineon Technologies AG
InventorAndreas Menkhoff
Life of this patent
Estimating the term…
Abstract
An apparatus comprises a filter unit comprising a plurality of different filters each configured to filter a first signal when selected. The apparatus may further comprise a control unit configured to select one of the plurality of filters depending on a strength of the first signal. Related methods may also be performed.
Claims25
An apparatus, comprising:
- a filter unit comprising a plurality of different filters each configured to, when selected, filter a first signal by suppressing frequencies that are outside a frequency range, the frequency range being centered around a center frequency of the first signal;
- and
- a control unit configured to select one of the plurality of filters depending on a strength of the first signal before the first signal is filtered by the filter unit and a strength of a second signal output from a previously selected one of the plurality of filters, and such that the one of the plurality of filters is selected responsive to a ratio of the strength of the first signal and the strength of the second signal at least reaching a predetermined threshold.
An apparatus, comprising:
- a filter unit comprising a plurality of different filters each configured to filter a first signal when selected such that a first frequency of the first signal is passed and a second frequency of the first signal is suppressed relative to the first frequency of the first signal, the filter unit further being configured to generate a second signal;
- and
- a control unit configured to select one of the plurality of filters depending upon a strength of the first signal before the first signal is filtered by the filter unit at the second frequency and a strength of the second signal, and such that the one of the plurality of filters is selected responsive to a ratio of the strength of the first signal and the strength of the second signal at least reaching a predetermined threshold.
A method, comprising:
- selecting a filter from a plurality of filters depending upon a strength of a first signal before the first signal is filtered by the selected filter and a strength of a second signal output from a previously selected one of the plurality of filters, wherein said selecting is performed responsive to a ratio of the strength of the first signal and the strength of the second signal at least reaching a predetermined threshold;
- and
- filtering the first signal with the selected filter so as to suppress frequencies outside a frequency range, wherein the frequency range is centered around a center frequency of the first signal.
A method, comprising:
- determining a signal strength of a first signal at frequencies outside a predetermined frequency range;
- determining a signal strength of a second signal output from one of a plurality of filters;
- selecting, responsive to a ratio of the signal strength of the first signal and the signal strength of the second signal at least reaching a predetermined threshold, a filter from the plurality of filters depending upon the signal strength of the first signal at the frequencies outside the predetermined frequency range and the signal strength of the second signal;
- and
- filtering the first signal with the selected filter.
2 more elements
An apparatus, comprising:
- a filter unit comprising a plurality of different filters each configured to provide, when a respective filter is selected, a different stopband attenuation that is centered around a center frequency of a first signal, the filter unit further being configured to filter the first signal using the selected one of the filters;
- and
- a control unit configured to select one of the plurality of filters depending on a strength of the first signal received by the filter unit and a strength of a second signal output from a previously selected one of the plurality of filters, and such that the one of the plurality of filters is selected responsive to a ratio of the strength of the first signal and the strength of the second signal at least reaching a predetermined threshold.
Dependencies are inferred from the claim text.