Wideband digital spectrometer
First Claim
1. A signal processor, comprising:
- (a) an input, configured to receive a time-continuous signal having an input dynamic range represented by ratio of a maximum amplitude of a first signal component, and a minimum amplitude difference between two modulation states represented within a second signal required for demodulation thereof, wherein the first signal component and the second signal component have substantially different spectral characteristics;
(b) a spectrometer, configured to receive the input, and to determine a spectral characteristic of at least the first signal;
(c) a spectral processor, responsive to the spectrometer, configured to selectively attenuate a maximum amplitude of the first signal to produce a filtered signal;
(a) a signal quantizer, configured to receive an output of the spectral processor, having a quantizer dynamic range less than the input dynamic range, the quantizer dynamic range being sufficient to detect the two modulation states represented within the second signal,wherein a signal path from the input to the signal quantizer is substantially linear and does not substantially introduce intermodulation distortion which interferes with detection of the two modulation states of the second signal.
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Abstract
A method for reducing interference, comprising receiving a wideband signal, having at least one large amplitude component; adaptively modifying the wideband signal with respect to at least one high intensity component without substantial introduction of non-linear distortion, while reducing a residual dynamic range thereof; digitizing the modified wideband signal to capture information describing at least the high intensity signal at a sampling rate sufficient to extract modulated information present within the wideband signal at an upper limit of the band. The system analyzes a spectral characteristic of the wideband signal; and extracts adaptation parameters for the adaptive filtering. The system therefore provides both large net dynamic range and wideband operation. Preferably, the digitizer and filter, and part of the spectral characteristic analyzer is implemented in using superconducting circuit technology, with, for example low temperature superconducting digital signal processing components, and high temperature superconducting analog filtering components.
67 Citations
21 Claims
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1. A signal processor, comprising:
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(a) an input, configured to receive a time-continuous signal having an input dynamic range represented by ratio of a maximum amplitude of a first signal component, and a minimum amplitude difference between two modulation states represented within a second signal required for demodulation thereof, wherein the first signal component and the second signal component have substantially different spectral characteristics; (b) a spectrometer, configured to receive the input, and to determine a spectral characteristic of at least the first signal; (c) a spectral processor, responsive to the spectrometer, configured to selectively attenuate a maximum amplitude of the first signal to produce a filtered signal; (a) a signal quantizer, configured to receive an output of the spectral processor, having a quantizer dynamic range less than the input dynamic range, the quantizer dynamic range being sufficient to detect the two modulation states represented within the second signal, wherein a signal path from the input to the signal quantizer is substantially linear and does not substantially introduce intermodulation distortion which interferes with detection of the two modulation states of the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A signal processing method, comprising:
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(a) receiving a time-continuous signal having an input dynamic range represented by ratio of a maximum amplitude of a first signal component, and a minimum amplitude difference between two modulation states represented within a second signal required for demodulation thereof, wherein the first signal component and the second signal component have substantially different spectral characteristics; (b) determining a spectral characteristic of at least the first signal with a spectrometer; (c) selectively attenuating a maximum amplitude of the first signal to produce a filtered signal with a spectral processor, responsive to the spectrometer; (d) quantizing an output of the spectral processor, wherein a quantization occurs with a quantizer dynamic range less than the input dynamic range, the quantization dynamic range being sufficient to detect the two modulation states represented within the second signal, wherein a signal path for processing the received time continuous signal up to the quantizing is substantially linear and does not substantially introduce intermodulation distortion which interferes with detection of the two modulation states of the second signal. - View Dependent Claims (19, 20, 21)
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Specification