Split frequency band signal digitizer and method
First Claim
Patent Images
1. A split frequency signal digitizer comprising:
- a first frequency translator coupled to receive an analog split frequency band signal, the analog split frequency band signal including a first segment having a first bandwidth and a second segment having a second bandwidth, the analog split frequency band signal having a total bandwidth greater than the sum of the first and second bandwidths, the frequency translator producing a frequency translated signal from the received signal, the frequency translated signal having substantially the same total bandwidth as the total bandwidth of the analog split frequency band signal;
an analog-to-digital converter responsive to the frequency translator, the analog-to-digital converter digitizing the frequency translated signal by sampling the frequency translated signal at a sampling rate less than twice the total bandwidth of the split frequency band signal to produce a digital signal, the digital signal including a digitized version of the first and second segments and aliased versions of the first and second segments.
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Abstract
A split frequency band signal digitizer (10) includes a first mixer (18) for translating a split-band signal (200) about a multiple of the sampling frequency. The split-band signal so translated is then communicated to an analog-to-digital converter (26). The digitized signal is then analyzed to recover an original portion of the split-band signal and a second portion of the signal aliased into a single Nyquist band.
192 Citations
20 Claims
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1. A split frequency signal digitizer comprising:
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a first frequency translator coupled to receive an analog split frequency band signal, the analog split frequency band signal including a first segment having a first bandwidth and a second segment having a second bandwidth, the analog split frequency band signal having a total bandwidth greater than the sum of the first and second bandwidths, the frequency translator producing a frequency translated signal from the received signal, the frequency translated signal having substantially the same total bandwidth as the total bandwidth of the analog split frequency band signal; an analog-to-digital converter responsive to the frequency translator, the analog-to-digital converter digitizing the frequency translated signal by sampling the frequency translated signal at a sampling rate less than twice the total bandwidth of the split frequency band signal to produce a digital signal, the digital signal including a digitized version of the first and second segments and aliased versions of the first and second segments. - View Dependent Claims (2, 3, 4)
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5. A method of digitizing an analog split frequency band signal comprising the steps of:
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receiving an analog split frequency band signal, the analog split frequency band signal having a first segment with a first bandwidth, a second segment with a second bandwidth, and a total bandwidth greater than the sum of the first and second bandwidths; frequency translating the received signal to produce a frequency translated signal, such that a reference frequency is located between frequencies associated with frequency translated versions of the first segment and the second segment in the frequency translated signal; and digitizing the frequency translated signal by sampling the frequency translated signal at a sampling rate less than twice the total bandwidth of the analog split frequency band signal to produce a digital signal, the digital signal including a digital representation of the first and second segments and aliased versions of the first and second segments. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A split frequency band signal digitizer comprising:
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means for receiving a split frequency band signal, the split frequency band signal having a first segment with a first bandwidth, a second segment with a second bandwidth, and a total bandwidth greater than the sum of the first and second bandwidths; means for mixing the received signal to produce a frequency translated signal, the frequency translated signal having a total bandwidth substantially the same as the total bandwidth of the split frequency band signal; and means for digitizing the frequency translated signal by sampling the frequency translated signal at a sampling rate less than twice the total bandwidth of the split frequency band signal to produce a digital signal, the digital signal including aliased versions of the first and second segments of the split frequency band signal. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A digital receiver comprising:
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a receiver detecting an analog split frequency signal including a first segment having a first bandwidth and a second segment having a second bandwidth, the analog split frequency signal having a total bandwidth greater than the sum of the first and second bandwidths; and an analog-to-digital converter responsive to the receiver, the analog-to-digital converter digitizing the analog split frequency signal detected by the receiver by sampling the analog split frequency signal at a sampling rate less than twice the total bandwidth of the analog split frequency signal to produce a digital signal, the digital signal including a digitized version of the first and second segments and aliased versions of the first and second segments. - View Dependent Claims (18, 19, 20)
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Specification