Digital undersampling
First Claim
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1. A signal processing system, comprising:
- an inverter configured to selectively negate a plurality of samples of a signal to provide negated and non-negated samples of the signal; and
a first low pass filter configured to use a first set of selected ones of the negated and non-negated samples as in-phase (I) of a plurality of complex samples and a second low pass filter configured to use a second set of selected ones of the negated and non-negated samples as quadrature (Q) components of the plurality of complex samples;
wherein the plurality of complex samples correspond to the output of an effective sampling function;
and further comprising a processor configured to select a beat frequency of the effective sampling function by adjusting the algorithm, including by iteratively adjusting one or both of;
a negation sequence in accordance with which samples comprising the plurality of samples of the signal are negated and a sorting sequence in accordance with which samples are sorted into I and Q components, until a beat frequency resulting in an output having a desired characteristic is achieved.
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Abstract
A method and system for processing a signal are disclosed. The method comprises: applying an algorithm to selectively negate a plurality of samples of the signal to provide negated and non-negated samples of the signal, and use the negated and non-negated samples as in-phase (I) and/or quadrature (Q) components of a plurality of complex samples, the algorithm being such that the plurality of complex samples are equivalent to the result that would be obtained by applying an effective sampling function to the signal, and selecting a beat frequency of the effective sampling function by adjusting the algorithm.
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15 Claims
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1. A signal processing system, comprising:
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an inverter configured to selectively negate a plurality of samples of a signal to provide negated and non-negated samples of the signal; and a first low pass filter configured to use a first set of selected ones of the negated and non-negated samples as in-phase (I) of a plurality of complex samples and a second low pass filter configured to use a second set of selected ones of the negated and non-negated samples as quadrature (Q) components of the plurality of complex samples; wherein the plurality of complex samples correspond to the output of an effective sampling function; and further comprising a processor configured to select a beat frequency of the effective sampling function by adjusting the algorithm, including by iteratively adjusting one or both of;
a negation sequence in accordance with which samples comprising the plurality of samples of the signal are negated and a sorting sequence in accordance with which samples are sorted into I and Q components, until a beat frequency resulting in an output having a desired characteristic is achieved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification