Patent US4192969A successfully refreshed from Google Patents.
US3909752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier phase correction circuit for data communications system
Assignee: DOWTY COMMUNICATIONS Inc A CORP OF
•
Filing: 1974-02-06
•
Granted: 1975-09-30
•
Expires: 1994-02-06
Abstract
Abstract A carrier phase correction circuit for a data communications system is provided which includes an automatic transversal equalizer and which utilizes the voltage control signals that are connected to the attenuators for the two taps adjacent to the central tap of the transversal equalizer, which signals are used in equalizing the baseband input to the equalizer. The two signals are compared and a first output produced when one of the signals is greater and a second output produced when the second is greater, the two outputs being used in controlling advancing and retarding the recovered carrier phase.
Inventors
- 👤 Richard L Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:32
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02; H04L27/06; H04L27/066; G; G08; G08B; G08B29/00; G08B29/18; G08B29/181
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A carrier phase correction circuit for a data communication system comprising an automatic transversal equalizer, including a center tap and first and second adjacent taps on the opposite sides of said center tap, first and second voltage controlled attenuators respectively connected to the outputs of said first and second taps, means for generating first and second voltage control signals for equalizinG the baseband input to the transversal equalizer, said first and second attenuators including input terminals for respectively receiving said first and second voltage control signals, and means for comparing said first and second voltage control signals and producing a first output when the first control signal is greater than the second control signal and a second control signal and a second output when the first control signal is less than the second control signal, said first and second outputs controlling advancing and retarding of the recovered carrier phase.
Claim 2
Dependent Claim
149 words
A carrier phase correction circuit for a data communication system comprising an automatic transversal equalizer, including a center tap and first and second adjacent taps on the opposite sides of said center tap, first and second voltage controlled attenuators respectively connected to the outputs of said first and second taps, means for generating first and second voltage control signals for equalizinG the baseband input to the transversal equalizer, said first and second attenuators including input terminals for respectively receiving said first and second voltage control signals, and means for comparing said first and second voltage control signals and producing a first output when the first control signal is greater than the second control signal and a second control signal and a second output when the first control signal is less than the second control signal, said first and second outputs controlling advancing and retarding of the recovered carrier phase.
References Cited (Backward Citations)
US3444396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |