US5796783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital transmission system
Assignee: TIBOURIAN ANDRE ALAIN
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Filing: 1995-10-31
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Granted: 1998-08-18
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Expires: 2015-10-31
Abstract
Abstract A waveform generating system generates one or more quadrature amplitude modulated (QAM) spectrum pairs which are combined with a frequency modulated (FM) spectrum in the center. The QAM spectrums are offset in frequency to result in a gap in the center to allow combining of the FM spectrum without interference.
Inventors
- 👤 James A. Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:40
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/38; H04L27/3845; H04L27/3854; H04L27/18; H04L27/20; H04L27/22; H04L27/233; H04L27/2332; H04L27/36; H04L27/362; H04L5/00; H04L5/02; H04L5/06; H04L27/0014; H04L2027/0024; H04L2027/0026; H04L2027/0028; H04L2027/0044; H04L2027/0053; H04L2027/0057
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A method for generating a composite modulated signal comprising the steps of: quadrature modulating a first signal and a second signal onto a first carrier to result in a first modulated carrier; quadrature modulating a third signal and a fourth signal onto a second carrier to result in a second modulated carrier; frequency modulating a fifth signal onto a third carrier to result in a third modulated carrier; combining said first modulated carrier with said second modulated carrier and with said third modulated carrier to result in a composite modulated signal wherein said first carrier and said second carrier are separated in frequency by a predetermined amount and said third carrier is in the center of said first carrier and said second carrier.
Claim 2
Independent Claim
123 words
A method for generating a composite modulated signal comprising the steps of: quadrature modulating a first signal and a second signal onto a first carrier to result in a first modulated carrier; quadrature modulating a third signal and a fourth signal onto a second carrier to result in a second modulated carrier; frequency modulating a fifth signal onto a third carrier to result in a third modulated carrier; combining said first modulated carrier with said second modulated carrier and with said third modulated carrier to result in a composite modulated signal wherein said first carrier and said second carrier are separated in frequency by a predetermined amount and said third carrier is in the center of said first carrier and said second carrier.
References Cited (Backward Citations)
US5222103A
Cited
US5251232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-17 | 2002-02-16 | 2002-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-17 | 2006-02-16 | 2006-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-17 | 2010-02-16 | 2010-08-18 | $7700.00 | Window Closed / Lapsed |