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US3902013A
Expired / Lapsed
US
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Frequency synthesis control for a frequency-modulated telegraphic transmitter
Assignee: Adret Electronique SA
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Filing: 1974-06-24
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Granted: 1975-08-26
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Expires: 1994-06-24
Abstract
Abstract Control device for a frequency-modulated telegraphic transmitter making use of a variable oscillator the frequency of which is controlled by a phase-lock loop. The counter-divider comprised in this loop is programmed by two different instruction numbers, given by a coding matrix, the passage from one instruction number to the other being controlled by the telegraphic signal. A frequency synthesizer, connected to the output of the oscillator, makes it possible to vary the control transmitting frequency.
Inventors
- 👤 Roger Charbonnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A device for controlling the frequency of a frequency modulated telegraphic transmitter as a function of the telegraphic signal amplitude, said device comprising a variable oscillator and a phase lock loop for controlling the variable oscillator''s frequency, said phase lock loop comprising a counter-divider connected at the oscillator output and programmable by an instruction number and a phase comparator having two inputs respectively connected to the counter-divider output and to a source of a two level standard frequency signal, said phase comparator having an output connected to a frequency control input of the variable oscillator, characterized by a coding matrix, means connected to said matrix for applying thereto a two level control signal derived from the telegraphic signal, said matrix being connected to the counter-divider for applying thereto first and second values of the said instruction number, when the said control signal is at, respectively, its first and second Levels.
Claim 2
Independent Claim
150 words
A device for controlling the frequency of a frequency modulated telegraphic transmitter as a function of the telegraphic signal amplitude, said device comprising a variable oscillator and a phase lock loop for controlling the variable oscillator''s frequency, said phase lock loop comprising a counter-divider connected at the oscillator output and programmable by an instruction number and a phase comparator having two inputs respectively connected to the counter-divider output and to a source of a two level standard frequency signal, said phase comparator having an output connected to a frequency control input of the variable oscillator, characterized by a coding matrix, means connected to said matrix for applying thereto a two level control signal derived from the telegraphic signal, said matrix being connected to the counter-divider for applying thereto first and second values of the said instruction number, when the said control signal is at, respectively, its first and second Levels.
Claim 3
Dependent Claim
21 words
A control device as claimed in claim 1, further comprising a frequency synthesizer connected to the output of the variable oscillator.
Claim 4
Dependent Claim
66 words
A control device as claimed in claim 2, characterized by logical means for enabling the change in level of the control signal applied to the matrix at the times of transition towards one of its levels of said standard frequency signal, the latter having such a waveform that said times of transition will not coincide with the times when the counter-divider is counting the instruction number.
Claim 5
Dependent Claim
26 words
A control device in accordance with claim 3, characterized in that said logical means include a bi-stable flip-flop arranged so as to act as a memory.
Claim 6
Dependent Claim
23 words
A control device in accordance with claim 2, characterized by a fixed ratio frequency divider connected between the oscillator output and the synthesizer.
Claim 7
Dependent Claim
34 words
A control device in accordance with claim 2, characterized by two fixed ratio frequency dividers connected respectively between the counter-divider and the phase comparator, and between the phase comparator and the standard frequency source.
Claim 8
Dependent Claim
27 words
A control device in accordance with claim 2, characterized by an adjustable voltage divider, connected between the phase comparator output and the variable oscillator frequency control input.
References Cited (Backward Citations)
US3611148A
Cited
US3731233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |