Filter
First Claim
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1. A method of filtering a signal, comprising:
- applying the signal to a delay line having a plurality of taps;
applying respective weighting coefficients of a windowing function to outputs from the plurality of taps to generate a plurality of weighted outputs;
repeatedly selecting the weighted outputs with the highest value;
filtering the selected outputs over time to generate a filtered signal, the filtering including;
passing the selected outputs to a further delay line having a further plurality of taps; and
determining an average of outputs from the further plurality of taps to generate the filtered signal; and
outputting the filtered signal.
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Abstract
Method and filter for filtering a signal, in which the signal is applied to a delay line having a plurality of taps. Respective weighting coefficients of a windowing function are applied to outputs from the plurality of taps to thereby generate a plurality of weighted outputs. The method comprises repeatedly selecting, for output, whichever of the weighted outputs has the highest value.
191 Citations
12 Claims
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1. A method of filtering a signal, comprising:
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applying the signal to a delay line having a plurality of taps; applying respective weighting coefficients of a windowing function to outputs from the plurality of taps to generate a plurality of weighted outputs; repeatedly selecting the weighted outputs with the highest value; filtering the selected outputs over time to generate a filtered signal, the filtering including; passing the selected outputs to a further delay line having a further plurality of taps; and determining an average of outputs from the further plurality of taps to generate the filtered signal; and outputting the filtered signal. - View Dependent Claims (2, 3)
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4. A method of processing a transmit signal for transmission from a transmitter, the method, comprising:
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generating a scaling factor from the transmit signal using a function which is dependent upon the value of the transmit signal and a threshold value, the threshold value indicating a maximum value to which the transmit signal is to be limited, wherein the function has a first form when the value of the transmit signal is above the threshold value and the function has a second form when the value of the transmit signal is below the threshold value; filtering the scaling factor to create a filtered scaling factor by applying the scaling factor to a delay line having a plurality of taps, applying respective weighting coefficients of a windowing function to outputs from the plurality of taps to thereby generate a plurality of weighted outputs, and repeatedly selecting the weighted outputs with the highest value; and applying the filtered scaling factor to the transmit signal such that the transmit signal does not exceed the maximum value indicated by the threshold value. - View Dependent Claims (5, 6, 7, 8)
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9. A filter for filtering a signal, comprising:
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a delay line having a plurality of taps, the delay line being arranged to receive the signal; weighting means for applying respective weighting coefficients of a windowing function to outputs from the plurality of taps to thereby generate a plurality of weighted outputs; selecting means for repeatedly selecting for output the weighted outputs with the highest value to create selected outputs; and filtering means for filtering the selected outputs over time to generate a filtered signal, the filtering means including; a further delay line having a further plurality of taps, the further delay line being arranged to receive the selected outputs; and determining means for determining an average of outputs from the further plurality of taps to generate the filtered signal. - View Dependent Claims (10, 11, 12)
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Specification