Patent US3128345A successfully refreshed from Google Patents.
US3128345A
Expired / Lapsed
US
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Limiter control system for stereophonic radio receiver
Assignee: RCA Corp
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Filing: 1960-11-01
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Granted: 1964-04-07
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Expires: 1980-11-01
Abstract
No abstract record available.
Inventors
- 👤 Larry A Freedman
- 👤 Joseph O Preisig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:43
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H03; H03G; H03G11/00; H03G11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN A STEREOPHONIC RADIO RECEIVER FOR AMPLITUDE AND ANGLE-MODULATED CARRIER SIGNALS, THE COMBINATION WITH AN INTERMEDIATE-FREQUENCY SIGNAL AMPLIFIER HAVING AUTOMATIC GAIN CONTROL MEANS, OF MEANS PROVIDING AN AMPLITUDEMODULATION SIGNAL CHANNEL COUPLED TO SAID AMPLIFIER AND AN AMPLITUDE-MODULATION DETECTOR THEREFOR HAVING AN OUTPUT CIRCUIT PROVIDING A POSITIVE-GOING DIRECT-CURRENT CONTROL VOLTAGE COMPONENT WHICH INCREASES WITHIN THE AVERAGE AMPLITUDE OF AN APPLIED SIGNAL, MEANS PROVIDING AN ANGLEMODULATION SIGNAL CHANNEL COUPLED TO SAID AMPLIFIER AND INCLUDING ANGLE-MODULATION DETECTOR MEANS, A SIGNAL LIMITER AMPLIFIER COUPLED TO SAID ANGLE-MODULATION DETECTOR MEANS FOR CONTROLLING THE SIGNAL AMPLITUDE APPLIED THERETO AND THE TRACKING RELATION OF THE SIGNAL OUTPUT FROM SAID SIGNAL CHANNELS, AND A TRACKING CONTROL CIRCUIT FOR SAID LIMITER AMPLIFIER OPERATIVE UNDER CONTROL OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER AND THE AUTOMATIC GAIN CONTROL ACTION THEREFOR AND IN RESPONSE TO THE CONTROL VOLTAGE COMPONENT DERIVED FROM THE AMPLITUDE-MODULATION DETECTOR OUTPUT CIRCUIT TO PROVIDE EFFECTIVE CONTROL OF SAID TRACKING RELATION.
Claim 2
Dependent Claim
150 words
IN A STEREOPHONIC RADIO RECEIVER FOR AMPLITUDE AND ANGLE-MODULATED CARRIER SIGNALS, THE COMBINATION WITH AN INTERMEDIATE-FREQUENCY SIGNAL AMPLIFIER HAVING AUTOMATIC GAIN CONTROL MEANS, OF MEANS PROVIDING AN AMPLITUDEMODULATION SIGNAL CHANNEL COUPLED TO SAID AMPLIFIER AND AN AMPLITUDE-MODULATION DETECTOR THEREFOR HAVING AN OUTPUT CIRCUIT PROVIDING A POSITIVE-GOING DIRECT-CURRENT CONTROL VOLTAGE COMPONENT WHICH INCREASES WITHIN THE AVERAGE AMPLITUDE OF AN APPLIED SIGNAL, MEANS PROVIDING AN ANGLEMODULATION SIGNAL CHANNEL COUPLED TO SAID AMPLIFIER AND INCLUDING ANGLE-MODULATION DETECTOR MEANS, A SIGNAL LIMITER AMPLIFIER COUPLED TO SAID ANGLE-MODULATION DETECTOR MEANS FOR CONTROLLING THE SIGNAL AMPLITUDE APPLIED THERETO AND THE TRACKING RELATION OF THE SIGNAL OUTPUT FROM SAID SIGNAL CHANNELS, AND A TRACKING CONTROL CIRCUIT FOR SAID LIMITER AMPLIFIER OPERATIVE UNDER CONTROL OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER AND THE AUTOMATIC GAIN CONTROL ACTION THEREFOR AND IN RESPONSE TO THE CONTROL VOLTAGE COMPONENT DERIVED FROM THE AMPLITUDE-MODULATION DETECTOR OUTPUT CIRCUIT TO PROVIDE EFFECTIVE CONTROL OF SAID TRACKING RELATION.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |