US4534036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase tracking loop impairment monitor for modems
Assignee: Paradyne Corp
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Filing: 1982-12-08
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Granted: 1985-08-06
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Expires: 2002-12-08
Abstract
Abstract This invention provides a system which monitors the phase error signal generated by a phase tracking loop. The system includes a first circuit for averaging the phase error signal thus generating an uncorrected phase error, and a second signal for integrating the phase error to generate a corrected phase signal. The two generated signals are added together to yield a total phase error signal.
Inventors
- 👤 William L. Betts
- 👤 Kenneth Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:24
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
In a modem utilizing a phase tracking loop provided to correct phase error by generating an instantaneous phase error signal, a monitor system comprising: a first circuit for deriving a corrected phase error signal comprising an integrator which integrates said instantaneous error signal, a first absolute value generator means and a low pass filter means; and a second circuit for deriving an uncorrected phase error signal by averaging said instantaneous phase error signal.
Claim 2
Dependent Claim
73 words
In a modem utilizing a phase tracking loop provided to correct phase error by generating an instantaneous phase error signal, a monitor system comprising: a first circuit for deriving a corrected phase error signal comprising an integrator which integrates said instantaneous error signal, a first absolute value generator means and a low pass filter means; and a second circuit for deriving an uncorrected phase error signal by averaging said instantaneous phase error signal.
Claim 3
Dependent Claim
31 words
The monitor system of claim 1 wherein said second circuit comprises a second absolute value generator means and another low pass filter provided to average said output of said tracking loop.
Claim 4
Dependent Claim
31 words
The monitor system of claim 1, further comprising an adding means which adds said corrected phase error signal and said uncorrected phase error signal to generate a total phase error signal.
Claim 5
Dependent Claim
24 words
The monitor system of claim 1 wherein said first circuit further comprises means for eliminating the D.C. level of said output of said integrator.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |