US3732378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the regeneration of rectangular signals
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1971-03-17
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Granted: 1973-05-08
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Expires: 1991-03-17
Abstract
Abstract The present invention relates to a process and a transistorized device for improving the reproduction of the duration of successive signals of a train of impulses such as are utilized, for example, in automatic telephonic systems for the transmission of call signals on each of the channels of a carrier current multiplex signal in which the rectangular signals of a train of rectangular impulses are generated by modulating the amplitude of a sinusoidal wave, the frequency of which is high by comparison with the recurrence frequency of said impulses, and in which the duration of the regenerated impulses is determined by the timeinterval between the passage of a threshold value by an impulse, on one hand, when that impulse passes from zero to maximum value and, on the other hand, when that impulse passes from its maximum value to zero, while according to the invention, the threshold value is varied in the same direction as the variations in its maximum value of this impulse during the time this impulse passes from maximum value to zero.
Inventors
- 👤 R Chaumont
- 👤 G Bargeton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/4465
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
A process for regenerating rectangular signals from an amplitude modulated sinusoidal wave, said amplitude modulated sinusoidal wave having been modulated by a rectangular signal, comprising the steps of: generating a signal output in response to detecting the magnitude of said amplitude modulated sinusoidal wave exceeding a threshold value; adjusting said threshold value in response to the maximum magnitude of said amplitude modulated sinusoidal wave during said rectangular signal, said threshold value being varied in the same direction as the maximum magnitude of said amplitude modulated sinusoidal wave during said rectangular signal; and terminating said signal output in response to detecting the magnitude of said amplitude modulated sinusoidal wave decreasing below said adjusted threshold value in order to regenerate the signal having a duration substantially equal to said rectangular signal.
Claim 2
Dependent Claim
129 words
A process for regenerating rectangular signals from an amplitude modulated sinusoidal wave, said amplitude modulated sinusoidal wave having been modulated by a rectangular signal, comprising the steps of: generating a signal output in response to detecting the magnitude of said amplitude modulated sinusoidal wave exceeding a threshold value; adjusting said threshold value in response to the maximum magnitude of said amplitude modulated sinusoidal wave during said rectangular signal, said threshold value being varied in the same direction as the maximum magnitude of said amplitude modulated sinusoidal wave during said rectangular signal; and terminating said signal output in response to detecting the magnitude of said amplitude modulated sinusoidal wave decreasing below said adjusted threshold value in order to regenerate the signal having a duration substantially equal to said rectangular signal.
Claim 3
Dependent Claim
144 words
Apparatus for regenerating a signal from an amplitude modulated sinusoidal wave haviNg a duration substantially equal to a rectangular signal used in modulating the amplitude modulated sinusoidal wave, comprising: a first transistor circuit, said first transistor circuit including a transistor having a base, collector and emitter, said base of said transistor receiving the amplitude modulated sinusoidal wave, said base being connected to said collector through a resistor and said emitter of said transistor being provided with a resistor connected in parallel with a capacitor, said capacitor being charged during a rectangular signal of the amplitude modulated sinusoidal wave and at least partially discharging through said resistor between rectangular signals; means for rectifying the signal developed on the collector of said transistor of said first transistor circuit; and switching means responsive to a rectified signal output of said rectifying means for producing said regenerated signal.
Claim 4
Dependent Claim
144 words
Apparatus for regenerating a signal from an amplitude modulated sinusoidal wave haviNg a duration substantially equal to a rectangular signal used in modulating the amplitude modulated sinusoidal wave, comprising: a first transistor circuit, said first transistor circuit including a transistor having a base, collector and emitter, said base of said transistor receiving the amplitude modulated sinusoidal wave, said base being connected to said collector through a resistor and said emitter of said transistor being provided with a resistor connected in parallel with a capacitor, said capacitor being charged during a rectangular signal of the amplitude modulated sinusoidal wave and at least partially discharging through said resistor between rectangular signals; means for rectifying the signal developed on the collector of said transistor of said first transistor circuit; and switching means responsive to a rectified signal output of said rectifying means for producing said regenerated signal.
Claim 5
Dependent Claim
29 words
Apparatus in accordance with claim 2 including means for amplifying the amplitude modulated sinusoidal wave before applying it to said base of said transistor of said first transistor circuit.
Claim 6
Dependent Claim
45 words
Apparatus in accordance with claim 3 wherein said amplifying means comprises a transistor having a base, emitter and collector, said emitter and collector circuits being provided with resistors and said collector being connected to said base circuit of said transistor in said first transistor circuit.
Claim 7
Dependent Claim
39 words
Apparatus in accordance with claim 2 wherein said resistor in the base-collector circuit of said transistor in said first transistor circuit is substantially larger than the resistor in said emitter circuit of said transistor of said first transistor circuit.
Claim 8
Dependent Claim
56 words
Apparatus in accordance with claim 2 wherein the value of said capacitor in said emitter circuit of said transistor in said first transistor circuit is selected so that the voltage across its terminals at the beginning of each rectangular signal of the amplitude modulated sinusoidal wave is equal to that in the absence of a signal.
Claim 9
Dependent Claim
43 words
Apparatus in accordance with claim 2 wherein said rectifying means includes a transformer, said transformer being connected between the collector of said transistor of said first transistor and a rectifying element, said switching means being responsive to the output of the rectifying element.
Claim 10
Dependent Claim
21 words
Apparatus in accordance with claim 2 wherein said switching means responsive to the output of said rectifying means comprises a transistor.
Claim 11
Dependent Claim
24 words
Apparatus in accordance with claim 2 wherein said amplitude modulated sinusoidal wave is a call signal of a channel of a telephone multiplex system.
Claim 12
Dependent Claim
36 words
Apparatus in accordance with claim 9 wherein the frequency of the sinusoidal wave of the amplitude modulated sinusoidal wave is large with respect to the recurrence frequency of rectangular waves of said amplitude modulated sinusoidal wave.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |