Technique for modulating orthogonal signals with one or more analog or digital signals
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First Claim
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1. Apparatus comprisingfirst means for providing a plurality of first component signals from a bandlimited analog signal, said analog signal being representable by samples generated at no less than a predetermined rate and each component signal being representable by samples generated at a rate less than said predetermined rate;
- second means for providing a plurality of second component signals from a digital information signal; and
means for modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times and for modulating each said orthogonal signal with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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Abstract
An arrangement for modulating orthogonal signals with an analog signal or a digital information signal. In either event, the information signal is partitioned into component signals which respectively modulate an associated one of the orthogonal signals. The analog signal has a predetermined bandwidth and may be represented by samples generated at no less than a predetermined rate. The component signals derived from this analog signal, on the other hand, may be represented by samples generated at a rate which is less than the predetermined rate. Apparatus is incorporated which detects a predetermined event which, in turn, determines whether the orthogonal signals are modulated by the analog or digital information signal. The value of the latter signal may be known at any time, such as when the digital information signal is a training sequence, or may be unknown. The foregoing modulation arrangement can also incorporate privacy or encryption schemes.
31 Citations
26 Claims
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1. Apparatus comprising
first means for providing a plurality of first component signals from a bandlimited analog signal, said analog signal being representable by samples generated at no less than a predetermined rate and each component signal being representable by samples generated at a rate less than said predetermined rate; -
second means for providing a plurality of second component signals from a digital information signal; and means for modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times and for modulating each said orthogonal signal with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising the steps of
providing a plurality of first component signals from a bandlimited analog signal, said analog signal being representable by samples generated at no less than a predetermined rate and each component signal being representable by samples generated at a rate less than said predetermined rate; -
providing a plurality of second component signals from a digital information signal; and modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times and for modulating each of said orthogonal signal with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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15. Apparatus comprising
means for demodulating each orthogonal signal in a set of orthogonal signals to obtain a corresponding one of first component signals at certain times, and to obtain a corresponding one of second component signals at other times; -
means for recovering a digital information signal from the second component signals; and means for recovering an analog signal from said first component signals obtained by demodulating said orthogonal signals, each first component signal being representable by samples generated at less than a predetermined rate and said analog signal being representable by samples generated at no less than said predetermined rate wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. Apparatus comprising
means for receiving an analog input signal having a predetermined bandwidth and generating at least two first component signals each having an associated bandwidth less than said predetermined bandwidth; -
means for providing at least two second component signals from a digital information signal; and means for modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times and for modulating each set of orthogonal signals with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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23. Apparatus comprising
means for demodulating each orthogonal signal in a set of orthogonal signals to obtain a corresponding one of first component signals at certain times, and to obtain a corresponding one of second component signals at other times; -
means for recovering a digital information signal from the second component signals; and means for recovering an analog signal from said first component signals obtained by demodulating said orthogonal signals, said analog signal having a predetermined bandwidth and each of said first component signals having an associated bandwidth that is less than said predetermined bandwidth wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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24. A method comprising the steps of
receiving an analog input signal having a predetermined bandwidth and generating at least two first component signals each having an associated bandwidth less than said predetermined bandwidth; -
providing at least two second component signals from a digital information signal; modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times; and modulating each set of orthogonal signals with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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25. A method comprising the steps of
demodulating each orthogonal signal in a set of orthogonal signals to obtain a corresponding one of first component signals at certain times, and to obtain a corresponding one of second component signals at other times; -
recovering a digital information signal from the second component signals; and recovering an analog signal from said first component signals obtained by demodulating said orthogonal signals, said analog signal having a predetermined bandwidth and each of said first component signals having an associated bandwidth that is less than said predetermined bandwidth wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.
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26. A modem apparatus comprising:
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means for receiving a data signal from a user of the modem apparatus to provide a digital signal; means for coding a voice signal to provide N coded voice signals, where N>
1;means for mapping the digital signal to provide N mapped digital signals; multiplexing means responsive to an energy level of the voice signal for switching between the N coded voice signals and the N mapped digital signals to provide N output signals; and means for modulating the N output signals to provide a modulated signal for transmission to an opposite endpoint.
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Specification
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Litigation Data
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Current AssigneeDelaware Radio Technologies LLC
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Original AssigneeParadyne Corporation (Dasan Networks Incorporated)
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InventorsBremer, Gordon
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Primary Examiner(s)Safourek, Benedict V.
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Application NumberUS08/378,766Time in Patent Office880 DaysField of Search375/216, 375/231, 375/260, 375/261, 370/20, 370/80, 370/111US Class Current375/216CPC Class CodesH04J 99/00 Subject matter not provided...H04L 27/0008 arrangements for allowing a...
