Digital signal conditioning
First Claim
Patent Images
1. A system for pre-processing a digital input signal comprising:
- a digital down converter (DDC) configured to down convert and down sample at a DDC sample rate a spectral component of the digital input signal to baseband, while reducing bandwidth and sample rate to create a down converted signal at baseband;
an interpolator configured to re-sample the down converted signal to produce a re-sampled signal with a new sample rate, wherein a dynamic range of the digital input signal is preserved and the new sample rate is different than the DDC sample rate;
two or more down samplers configured to produce two or more down sampled signals associated with the down samplers, wherein the two or more down samplers are connected in series, with the re-sampled signal input to a first one of the two or more down samplers, wherein the two or more down sampled signals are output from each of the two or more down samplers connected in series; and
a multiplexer configured to multiplex one of the group of;
the digital input signal, the down converted signal, and one of the two or more down sampled signals to an output line.
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Abstract
Methods, systems and other embodiments associated with pre-processing a signal for spectral analysis are presented. A system for pre-processing a digital input signal includes a digital down converter (DDC), an interpolator, and a series of down samplers. The DDC modulates the digital input signal to create a down converted signal. The interpolator re-samples the down converted signal to produce a re-sampled signal. The series of down samplers produces down sampled signals. The multiplexer selects one of the digital input signal, the down converted signal, and the down sampled signals and routes the selected signal to an output line.
15 Citations
20 Claims
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1. A system for pre-processing a digital input signal comprising:
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a digital down converter (DDC) configured to down convert and down sample at a DDC sample rate a spectral component of the digital input signal to baseband, while reducing bandwidth and sample rate to create a down converted signal at baseband; an interpolator configured to re-sample the down converted signal to produce a re-sampled signal with a new sample rate, wherein a dynamic range of the digital input signal is preserved and the new sample rate is different than the DDC sample rate; two or more down samplers configured to produce two or more down sampled signals associated with the down samplers, wherein the two or more down samplers are connected in series, with the re-sampled signal input to a first one of the two or more down samplers, wherein the two or more down sampled signals are output from each of the two or more down samplers connected in series; and a multiplexer configured to multiplex one of the group of;
the digital input signal, the down converted signal, and one of the two or more down sampled signals to an output line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of digital signal conditioning comprising:
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down converting and down sampling a received input signal at a digital down converter (DDC) sample rate to produce a down converted signal; determining a desired FFT rate corresponding to an FFT length of a FFT logic; using the desired FFT rate as an output rate of a series of down samplers connected back-to-back and calculating down sampler input values of the series of down samplers until a specific down sampler input value of one of the down samplers is the closest to the DDC sample rate as compared to the other down sampler input values of the series of down samplers, wherein the specific down sampler input value is a value of a desired arbitrary resampler sample rate; resampling the down converted signal at the desired arbitrary resampler sample rate to produce a resampled signal, wherein a bandwidth of the down converted signal is preserved and the desired arbitrary resampler sample rate is different than the DDC sample rate; inputting the resampled signal into the series of down samplers; outputting to the FFT logic the output value of a down sampler of the series of down samplers that produces the desired FFT rate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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down converting and down sampling an input signal at a DDC sample rate to produce a down converted signal; determining a desired FFT rate; sequentially doubling the desired FFT rate creating doubled values until a doubled value exceeds the DDC sample rate; assigning a created doubled value that is the closest to the DDC sample rate as a desired arbitrary resampler rate; resampling the down converted signal at the desired arbitrary resampler rate to produce a resampled signal, wherein a bandwidth of the down converted signal is preserved and the DDC sample rate is different than the desired arbitrary resampler rate; passing the resampled signal through a series of 2-to-1 down samplers to produce a new signal at the desired FFT rate; and inputting the new signal into a spectrum analyzer.
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Specification