US3636477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulator including selectively controllable delay line
Assignee: Alcatel CIT SA
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Filing: 1969-11-05
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Granted: 1972-01-18
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Expires: 1989-11-05
Abstract
Abstract A frequency modulated HF wave is obtained by applying a HF carrier wave of preselected frequency to a variable phase shifter consisting of a delay line made up of a plurality of switchable delay units controlled by a pulse counter to effect a periodic phase shift of 360*, wide band operation being ensured by correction of the effective capacity of the counter depending on the value of high frequency selected.
Inventors
- 👤 Jacques Selz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:25
CPC Classifications
H; H03; H03C; H03C3/00; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/081; H03L7/0812; H03L7/0814
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A modulator for frequency modulation of a relatively high carrier-frequency variable over a relatively wide range, comprising: modulator means responsive to a modulation frequency for modulating a relatively low auxiliary carrier-frequency with said modulation frequency; a counter connected to count successive cycles of the modulated auxiliary carrier-frequency; logic circuit means responsive to a signal representing a preselected value of said high carrier-frequency for applying to said counter a fixed minimum reference value corresponding to the preselected carrier-frequency; variable means for generating said preselected high carrier-frequency; a chain of delay elements connected to receive said preselected carrier-frequency and means for switching said delay elements sequentially in accordance with the changing states of said counter to maintain a phase rotation of the order of 360*.
Claim 2
Dependent Claim
123 words
A modulator for frequency modulation of a relatively high carrier-frequency variable over a relatively wide range, comprising: modulator means responsive to a modulation frequency for modulating a relatively low auxiliary carrier-frequency with said modulation frequency; a counter connected to count successive cycles of the modulated auxiliary carrier-frequency; logic circuit means responsive to a signal representing a preselected value of said high carrier-frequency for applying to said counter a fixed minimum reference value corresponding to the preselected carrier-frequency; variable means for generating said preselected high carrier-frequency; a chain of delay elements connected to receive said preselected carrier-frequency and means for switching said delay elements sequentially in accordance with the changing states of said counter to maintain a phase rotation of the order of 360*.
Claim 3
Dependent Claim
40 words
A modulator as claimed in claim 1, including an amplifier connected to said modulator means for supplying said modulation frequency thereto, the gain of said ampLifier being controlled in accordance with said signal representing said preselected value of said carrier-frequency.
Claim 4
Dependent Claim
44 words
A modulator as claimed in claim 2, including circuitry for providing the preselected value of carrier-frequency and a frequency discriminator connected to sense the carrier-frequency, said logic circuit means being connected to the frequency discriminator via an analogue-to-digital converter to sense the carrier frequency.
Claim 5
Dependent Claim
35 words
A modulator as claimed in claim 1, including a digital element for indicating said preselected carrier-frequency and generator means connected to said digital element for supplying said preselected carrier-frequency to said chain of delay elements.
Claim 6
Dependent Claim
26 words
A modulator as claimed in claim 4, in which the logic circuit means is connected to said digital element to sense said preselected value of carrier-frequency.
Claim 7
Dependent Claim
40 words
A modulator as claimed in claim 5, including an amplifier connected to said modulator means for supplying said modulation frequency thereto, the gain of said amplifier being controlled in accordance with said signal representing said preselected value of said carrier-frequency.
Claim 8
Dependent Claim
26 words
A modulator as claimed in claim 6, in which said amplifier is connected to said digital element to sense the preselected carrier-frequency via an analogue-to-digital converter.
Claim 9
Dependent Claim
23 words
A modulator as claimed in claim 1 in which the logic circuitry includes a memory for holding correction frequencies of the carrier-frequency band.
Claim 10
Dependent Claim
29 words
A modulator as claimed in claim 5 in which said amplifier is connected to said digital element to sense the preselected value of the carrier-frequency via an analogue-to-digital converter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |