Patent US4262355A successfully refreshed from Google Patents.
US4262355A
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US
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System for limiting intermodulation distortion of talkspurt signals
Assignee: Lockheed Martin Corp
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Filing: 1979-05-11
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Granted: 1981-04-14
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Expires: 1999-05-11
Abstract
Abstract In a single-voice-signal-per-carrier communications system, means are provided for limiting the intermodulation distortion in a common amplifier of a plurality of talkspurt voice signals. Separate carrier waves and voice signals are applied to respective modulators. The voice-operated-switch signals associated with respective voice signals are applied through a limiter circuit to the respective modulators. The limiter circuit limits the number of modulators generating talkspurt signals at any instant to a number which avoids intermodulation distortion.
Inventors
- 👤 Leonard N. Schiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:30
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
The combination of N sources of voice signals and accompanying voice-operated-switch signals, N modulators having their outputs coupled through a common amplifier, each modulator being receptive to a voice signal from a respective source of voice signals and to a respective carrier frequency wave, and each having a voice-operated-switch signal input, and a limiting circuit applying no more than C of the voice-operated-switch signals from said N sources to said N modulators, where C is less than N, whereby to limit cross modulation of said voice signals in said common amplifier.
Claim 2
Dependent Claim
91 words
The combination of N sources of voice signals and accompanying voice-operated-switch signals, N modulators having their outputs coupled through a common amplifier, each modulator being receptive to a voice signal from a respective source of voice signals and to a respective carrier frequency wave, and each having a voice-operated-switch signal input, and a limiting circuit applying no more than C of the voice-operated-switch signals from said N sources to said N modulators, where C is less than N, whereby to limit cross modulation of said voice signals in said common amplifier.
Claim 3
Dependent Claim
72 words
The combination circuit comprises, N flip-flops each having set and reset inputs and an output coupled t a respective one of said N modulators, threshold means providing an output when less than C flip-flops are set, and means sequentially to set said flip-flops when the corresponding voice-operated-switch signal is present, and there is an output from said threshold means, and means to reset flip-flops at the termination of a corresponding voice-operated-switch signal.
Claim 4
Dependent Claim
72 words
The combination circuit comprises, N flip-flops each having set and reset inputs and an output coupled t a respective one of said N modulators, threshold means providing an output when less than C flip-flops are set, and means sequentially to set said flip-flops when the corresponding voice-operated-switch signal is present, and there is an output from said threshold means, and means to reset flip-flops at the termination of a corresponding voice-operated-switch signal.
Claim 5
Dependent Claim
29 words
The combination of claim 2 wherein said threshold means comprises a counter which is incremented when any flip-flop is set and which is decremented when any flip-flop is reset.
Claim 6
Dependent Claim
17 words
The combination of claim 3 wherein said means sequentially to set flip-flops includes an N-stage ring counter.
Claim 7
Dependent Claim
49 words
The combination of claim 3 wherein said means sequentially to set flip-flops includes N respective "and" gates each enabled by a voice-operated switch signal, and output from a stage of said ring counter, and output from said threshold means, and the absence of an output from the respective flip-flop.
Claim 8
Dependent Claim
24 words
The combination of claim 5 wherein said means to reset flip-flops includes trigger circuits each responsive to the termination of a respective voice-operated-switch 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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |