US3123673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for stereophonic reproduction of signals
Assignee: —
•
Filing: —
•
Granted: 1964-03-03
•
Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:36
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218; H04R; H04R5/00; H04R5/04; H04S; H04S1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A CIRCUIT FOR THE STEREOPHONIC REPRODUCTION OF SIGNALS OF THE TYPE HAVING A SUM SIGNAL OF FIRST AND SECOND COHERENT STEREOPHONIC SIGNALS, AND A DIFFERENCE SIGNAL OF SAID FIRST AND SECOND SIGNALS, SAID DIFFERENCE SIGNAL BEING IN THE FORM OF AMPLITUDE MODULATION OF A SUBCARRIER, SAID CIRCUIT COMPRISING A SOURCE OF SAID SUM AND DIFFERENCE SIGNALS, FIRST AND SECOND AMPLITUDE DETECTOR CIRCUITS COMPRISING FIRST AND SECOND UNIDIRECTIONAL CURRENT DEVICES RESPECTIVELY, FREQUENCY DEPENDENT ATTENUATOR MEANS CONNECTED TO APPLY SAID SUM AND DIFFERENCE SIGNALS IN COMMON TO SAID FIRST AND SECOND AMPLITUDE DETECTOR CIRCUITS, SAID FIRST AND SECOND UNIDIRECTIONAL CURRENT DEVICES BEING CONNECTED WITH OPPOSITE POLARITIES WITH RESPECT TO SAID SUM SIGNAL, AND MEANS CONNECTED TO SAID FIRST AND SECOND DETECTOR CIRCUITS TO DERIVE FIRST AND SECOND STEREOPHONIC OUTPUT SIGNALS RESPECTIVELY, SAID ATTENUATOR MEANS HAVING SUBSTANTIALLY UNIFORM DAMPING FACTORS IN THE FREQUENCY RANGES OF EACH OF SAID SUM AND DIFFERENCE SIGNALS, THE DAMPING FACTOR FOR THE FREQUENCY BAND OF SAID SUM SIGNAL BEING GREATER THAN THE DAMPING FACTOR FOR THE FREQUENCY BAND OF SAID DIFFERENCE SIGNAL.
Claim 2
Dependent Claim
174 words
A CIRCUIT FOR THE STEREOPHONIC REPRODUCTION OF SIGNALS OF THE TYPE HAVING A SUM SIGNAL OF FIRST AND SECOND COHERENT STEREOPHONIC SIGNALS, AND A DIFFERENCE SIGNAL OF SAID FIRST AND SECOND SIGNALS, SAID DIFFERENCE SIGNAL BEING IN THE FORM OF AMPLITUDE MODULATION OF A SUBCARRIER, SAID CIRCUIT COMPRISING A SOURCE OF SAID SUM AND DIFFERENCE SIGNALS, FIRST AND SECOND AMPLITUDE DETECTOR CIRCUITS COMPRISING FIRST AND SECOND UNIDIRECTIONAL CURRENT DEVICES RESPECTIVELY, FREQUENCY DEPENDENT ATTENUATOR MEANS CONNECTED TO APPLY SAID SUM AND DIFFERENCE SIGNALS IN COMMON TO SAID FIRST AND SECOND AMPLITUDE DETECTOR CIRCUITS, SAID FIRST AND SECOND UNIDIRECTIONAL CURRENT DEVICES BEING CONNECTED WITH OPPOSITE POLARITIES WITH RESPECT TO SAID SUM SIGNAL, AND MEANS CONNECTED TO SAID FIRST AND SECOND DETECTOR CIRCUITS TO DERIVE FIRST AND SECOND STEREOPHONIC OUTPUT SIGNALS RESPECTIVELY, SAID ATTENUATOR MEANS HAVING SUBSTANTIALLY UNIFORM DAMPING FACTORS IN THE FREQUENCY RANGES OF EACH OF SAID SUM AND DIFFERENCE SIGNALS, THE DAMPING FACTOR FOR THE FREQUENCY BAND OF SAID SUM SIGNAL BEING GREATER THAN THE DAMPING FACTOR FOR THE FREQUENCY BAND OF SAID DIFFERENCE SIGNAL.
References Cited (Backward Citations)
US2698379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-03 | 1967-09-02 | 1968-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-03 | 1971-09-02 | 1972-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-03 | 1975-09-02 | 1976-03-03 | $7700.00 | Window Closed / Lapsed |