Patent US3229232A successfully refreshed from Google Patents.
US3229232A
Expired / Lapsed
US
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Vestigial sideband modulation system
Assignee: BAE Systems Electronics Ltd
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Filing: 1963-02-14
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Granted: 1966-01-11
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Expires: 1983-02-14
Abstract
No abstract record available.
Inventors
- 👤 Sosin Boleslaw Marian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A VESTIGIAL SIDEBAND MODULATION SYSTEM COMPRISING TWO DOUBLE SIDEBAND MODULATORS; MEANS FOR APPLYING CARRIER INPUT TO SAID MODULATORS; A DIVIDER HAVING TWO INPUT TERMINALS AND TWO OUTPUT TERMINALS AND PROVIDING FROM TWO MODULATING SIGNALS APPLIED ONE TO ONE INPUT TERMINAL AND THE OTHER TO THE OTHER INPUT TERMINAL WITH A PHASE RELATION OF N$, WHERE N IS ANY INTEGER INCLUDING ZERO, THE TWO MODULATING SIGNAL AT EACH OUTPUT TERMINAL IN PHASE QUADRATURE WITH EACH OTHER, CORRESPONDING MODULATING SIGNALS ON SAID TWO OUTPUT TERMINALS ALSO BEING IN PHASE QUADRATURE; MEANS FOR APPLYING TWO MODULATING SIGNALS TO THE TWO INPUT TERMINALS OF THE DIVIDER; MEANS FOR APPLYING THE RESULTING TWO OUTPUTS FROM THE DIVIDER, ONE TO ONE MODULATOR AND THE OTHER TO THE OTHER MODULATOR; LOW PASS FILTERING MEANS IN ONE OF THE MODULATING SIGNAL CHANNELS LEADING TO SAID DIVIDER; AND MEANS FOR COMBINING THE OUTPUTS FROM SAID MODULATORS IN QUADRATURE PHASE RELATIONSHIP.
Claim 2
Dependent Claim
151 words
A VESTIGIAL SIDEBAND MODULATION SYSTEM COMPRISING TWO DOUBLE SIDEBAND MODULATORS; MEANS FOR APPLYING CARRIER INPUT TO SAID MODULATORS; A DIVIDER HAVING TWO INPUT TERMINALS AND TWO OUTPUT TERMINALS AND PROVIDING FROM TWO MODULATING SIGNALS APPLIED ONE TO ONE INPUT TERMINAL AND THE OTHER TO THE OTHER INPUT TERMINAL WITH A PHASE RELATION OF N$, WHERE N IS ANY INTEGER INCLUDING ZERO, THE TWO MODULATING SIGNAL AT EACH OUTPUT TERMINAL IN PHASE QUADRATURE WITH EACH OTHER, CORRESPONDING MODULATING SIGNALS ON SAID TWO OUTPUT TERMINALS ALSO BEING IN PHASE QUADRATURE; MEANS FOR APPLYING TWO MODULATING SIGNALS TO THE TWO INPUT TERMINALS OF THE DIVIDER; MEANS FOR APPLYING THE RESULTING TWO OUTPUTS FROM THE DIVIDER, ONE TO ONE MODULATOR AND THE OTHER TO THE OTHER MODULATOR; LOW PASS FILTERING MEANS IN ONE OF THE MODULATING SIGNAL CHANNELS LEADING TO SAID DIVIDER; AND MEANS FOR COMBINING THE OUTPUTS FROM SAID MODULATORS IN QUADRATURE PHASE RELATIONSHIP.
References Cited (Backward Citations)
US2173145A
Cited
GB907122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |