US5077757A
Expired / Lapsed
US
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System for synthesizing a modulated signal
Assignee: Motorola Solutions Inc
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Filing: 1990-07-30
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Granted: 1991-12-31
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Expires: 2010-07-30
Abstract
Abstract A modulation system and associated method therefor for synthesizing a modulated signal. Information is converted into an in-phase signal portion and a quadrature signal portion. The two signal portions are combined by summation and difference operations, and the results are stored in registers. A multiplexer samples the resultant values stored in the registers wherein each register is sampled at least once during a period defined by a frequency of a carrier. The output of the multiplexer is a synthesized, modulated signal.
Inventors
- 👤 Stephen V. Cahill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:13
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2032; H04L27/2092
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
188 words
A modulation system for synthesizing a modulated signal at a carrier frequency, said system comprising: means for converting an input signal into a first input signal portion and a second input signal portion, with said first and second input signal portions, respectively, being maintained in a ninety-degree phase relation therebetween; means forming a first summed value for adding the first data signal portion and the second data signal portion; means forming a first difference value for subtracting the second data signal portion from the first data signal portion. means forming a second difference value for subtracting the second data signal portion from an inverse of the first data signal portion; means forming a second summed value for adding an inverse of the first signal portion and the second signal portion; and means for sampling, at a predetermined sampling rate and in a desired, repetitive sequence, the first summed value, the first difference value, the second difference value, and the second summed value, said means for sampling generating an output signal having discrete signal values corresponding to values of the desired repetitive sequence to synthesize the modulated signal thereby.
Claim 2
Dependent Claim
188 words
A modulation system for synthesizing a modulated signal at a carrier frequency, said system comprising: means for converting an input signal into a first input signal portion and a second input signal portion, with said first and second input signal portions, respectively, being maintained in a ninety-degree phase relation therebetween; means forming a first summed value for adding the first data signal portion and the second data signal portion; means forming a first difference value for subtracting the second data signal portion from the first data signal portion. means forming a second difference value for subtracting the second data signal portion from an inverse of the first data signal portion; means forming a second summed value for adding an inverse of the first signal portion and the second signal portion; and means for sampling, at a predetermined sampling rate and in a desired, repetitive sequence, the first summed value, the first difference value, the second difference value, and the second summed value, said means for sampling generating an output signal having discrete signal values corresponding to values of the desired repetitive sequence to synthesize the modulated signal thereby.
Claim 3
Dependent Claim
19 words
The modulation system of claim 1 further comprising means forming a first register for storing said first summed value.
Claim 4
Dependent Claim
19 words
The modulation system of claim 2 further comprising means forming a second register for storing said first difference value.
Claim 5
Dependent Claim
19 words
The modulation system of claim 3 further comprising means forming a third register for storing said second difference value.
Claim 6
Dependent Claim
19 words
The modulation system of claim 4 further comprising means forming a fourth register for storing said second summed value.
Claim 7
Dependent Claim
27 words
The modulation system of claim 5 wherein said predetermined sampling rate is determinative of the carrier frequency of the synthesized, modulated signal formed of the output signal.
Claim 8
Dependent Claim
35 words
The modulation system of claim 6 wherein said means for sampling comprises a commutator for sampling said first and second summed values and said first and second difference values, respectively, in said desired, repetitive sequence.
Claim 9
Dependent Claim
26 words
The modulation system of claim 7 wherein said commutator comprises a multiplexer for sampling the values stored in said first, second, third, and fourth registers, respectively.
Claim 10
Dependent Claim
20 words
The modulation system of claim 1 further comprising means for converting said output signal generated by said means for sampling.
Claim 11
Dependent Claim
19 words
The modulation system of claim 9 further comprising means for filtering output signal generated by the means for converting.
Claim 12
Dependent Claim
19 words
The modulation system of claim 10 wherein said means for filtering filters output signal of high-frequency harmonic components thereof.
Claim 13
Independent Claim
172 words
A method for synthesizing a modulated signal at a carrier frequency, said method comprising the steps of: converting an input signal into a first input signal portion and a second input signal portion, with said first and second input signal portions, respectively, being maintained in a ninety-degree phase relation therebetween; adding the first signal portion and the second signal portion to form a first summed value thereby; subtracting the second signal portion from the first signal portion to form a first difference value thereby; subtracting the second data signal portion from an inverse of the first data signal portion to form a second difference value thereby; adding an inverse of the first signal portion and the second signal portion to form a second summed value thereby; sampling at a predetermined sampling rate and in a desired, repetitive sequence, the first summed value, the first difference value, the second difference value, and the second summed value; and generating an output signal having discrete signal values corresponding to values of the desired repetitive sequence.
Claim 14
Independent Claim
172 words
A method for synthesizing a modulated signal at a carrier frequency, said method comprising the steps of: converting an input signal into a first input signal portion and a second input signal portion, with said first and second input signal portions, respectively, being maintained in a ninety-degree phase relation therebetween; adding the first signal portion and the second signal portion to form a first summed value thereby; subtracting the second signal portion from the first signal portion to form a first difference value thereby; subtracting the second data signal portion from an inverse of the first data signal portion to form a second difference value thereby; adding an inverse of the first signal portion and the second signal portion to form a second summed value thereby; sampling at a predetermined sampling rate and in a desired, repetitive sequence, the first summed value, the first difference value, the second difference value, and the second summed value; and generating an output signal having discrete signal values corresponding to values of the desired repetitive sequence.
Claim 15
Dependent Claim
19 words
The method of claim 12 comprising the further step of storing said first summed value in a first register.
Claim 16
Dependent Claim
19 words
The method of claim 13 comprising the further step of storing said first difference value in a second register.
Claim 17
Dependent Claim
19 words
The method of claim 14 comprising the further step of storing said second difference value in a third register.
Claim 18
Dependent Claim
19 words
The method of claim 15 comprising the further step of storing said second summed value in a fourth register.
Claim 19
Dependent Claim
37 words
The method of claim 16 wherein the sampling rate at which the resultant values are sampled during said step of sampling is determinative of the carrier frequency of the synthesized, modulated signal formed of the output signal.
Claim 20
Dependent Claim
30 words
The method of claim 17 wherein said step of sampling comprises sampling said first and second summed values and said first and second difference values, respectively, in a predetermined sequence.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |