US3714577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single sideband am-fm modulation system
Assignee: Individual
•
Filing: 1971-05-06
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Granted: 1973-01-30
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Expires: 1991-05-06
Abstract
Abstract A sub-carrier signal is amplitude modulated. This sub-carrier AM modulated signal is then used to frequency modulate a radio frequency carrier. The radio frequency is then multiplied. One sideband in the modulated radio frequency signal is passed through a bandpass filter and then transmitted.
Inventors
- 👤 W Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:58
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
Single sideband AM-FM modulation means comprising a subcarrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
Claim 2
Dependent Claim
74 words
Single sideband AM-FM modulation means comprising a subcarrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
Claim 3
Dependent Claim
74 words
Single sideband AM-FM modulation means comprising a sub-carrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
Claim 4
Dependent Claim
74 words
Single sideband AM-FM modulation means comprising a sub-carrier frequency signal generator, means connected to amplitude modulate said sub-carrier signal, a radio frequency signal generator, means to frequency modulate said radio frequency signal with said modulated sub-carRier signal, to create multiple sidebands, frequency multiplying means connected to said frequency generator, and narrow bandpass filter means tuned to a frequency between two of said multiple sidebands so as to pass one sideband of said modulated signal.
Claim 5
Dependent Claim
18 words
Apparatus as in claim 1 wherein said bandpass filter means is a narrow filter, of substantially 5 KHz.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |