US3731204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency tracking device
Assignee: IFP Energies nouvelles
•
Filing: 1971-09-20
•
Granted: 1973-05-01
•
Expires: 1991-09-20
Abstract
Abstract Frequency tracking device for determining the frequency shift between the predominant frequency of an input signal spectrum and a reference frequency, comprising means for generating a local signal of controlled frequency, means for producing a resultant signal at a frequency which is the sum of the respective frequencies of the input signal and the local signal and means for controlling the frequency of said local signal in response to the phase difference between the phase of said resultant signal and the phase of a signal at twice the reference frequency.
Inventors
- 👤 R Deligniers
- 👤 A Ausset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
A frequency tracking device for generating a signal whose frequency depends on the predominant frequency of an input signal spectrum comprising means for mixing the input signal with a local signal whose frequency depends on a control signal to provide a resultant signal,filtering means connected with said mixing means for eliminating the low frequency component of the resultant signal issued from said mixing means, means for producing the control signal in the form of a linear function of the phase difference between the phase of the signal issued from the filtering means and the phase of a signal applied to the control signal producing means at a frequency multiple of the constant frequency of a reference signal, and means responsive to the control signal providing means for generating the local signal in accordance with the control signal.
Claim 2
Dependent Claim
137 words
A frequency tracking device for generating a signal whose frequency depends on the predominant frequency of an input signal spectrum comprising means for mixing the input signal with a local signal whose frequency depends on a control signal to provide a resultant signal,filtering means connected with said mixing means for eliminating the low frequency component of the resultant signal issued from said mixing means, means for producing the control signal in the form of a linear function of the phase difference between the phase of the signal issued from the filtering means and the phase of a signal applied to the control signal producing means at a frequency multiple of the constant frequency of a reference signal, and means responsive to the control signal providing means for generating the local signal in accordance with the control signal.
Claim 3
Dependent Claim
70 words
A device according to claim 1, wherein the means for generating the local signal comprises first means connected with the control signal producing means for converting the control signal to a binary digital signal, second means connected with the converting means for memorizing the digital signal, and third means responsive to the digital signal for synthetizing the local signal whose frequency depends on the binary value of the digital signal.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |