US3249696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified extended stereo
Assignee: Zenith Electronics LLC
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Filing: 1961-10-16
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Granted: 1966-05-03
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Robert S Van Sickle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:29
CPC Classifications
H; H04; H04S; H04S1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
A NETWORK FOR INCREASING THE APPARENT SEPARATION BETWEEN LEFT AND RIGHT STEREO SOUND SIGNALS GENERATED BY TWO SOUND REPRODUCERS COMPRISING: MEANS FOR GENERATING DIFFERENT LEFT AND RIGHT ELECTRICAL SIGNAL REPRESENTATIVE OF DIFFERENT LEFT AND RIGHT SOUND SIGNALS; FIRST AND SECOND SEPARATE SIGNAL TRANSLATING CHANNELS RESPECTIVELY COUPLED TO SAID SOUND REPRODUCERS; MEANS FOR APPLYING ONLY ONE OF SAID ELECTRICAL SIGNALS TO SAID FIRST CHANNEL IN A PARTICULAR PHASE; MEANS FOR APPLYING THE OTHER OF SAID ELECTRICAL SIGNALS TO SAID SECOND CHANNEL IN A PARTICULAR PHASE; AND MEANS FOR SELECTIVELY APPLYING A PORTION OF SAID ONE SIGNAL INTO SAID SECOND CHANNEL TO DEVELOP THEREIN A SIGNAL CONTAINING SAID OTHER SIGNAL, AT A PREDETERMINED AVERAGE AMPLITUDE AND A PORTION OF SAID ONE SIGNAL, AT AN AVERAGE AMPLITUDE WHICH IS LESS THAN THAT OF SAID OTHER SIGNAL AND IN PHASE OPPOSITION TO THAT OF SAID ONE SIGNAL IN SAID FIRST CHANNEL, AND FOR SELECTIVELY APPLYING A PORTION OF SAID OTHER SIGNAL INTO SAID FIRST CHANNEL TO DEVELOP THEREIN A SIGNAL CONTAINING SAID ONE SIGNAL, AT A PREDETERMINED AVERAGE AMPLITUDE, AND A PORTION OF SAID OTHER SIGNAL, AT AN AVERAGE AMPLITUDE WHICH IS LESS THAN THAT OF SAID ONE SIGNAL AND IN PHASE OPPOSITION TO THAT OF SAID OTHER SIGNAL IN SAID SECOND CHANNEL, TO INCREASE THE APPARENT SEPARATION BETWEEN THE LEFT AND RIGHT SOUND SIGNALS GENERATED BY SAID REPRODUCERS IN RESPONSE TO SAID SIGNALS.
Claim 2
Dependent Claim
230 words
A NETWORK FOR INCREASING THE APPARENT SEPARATION BETWEEN LEFT AND RIGHT STEREO SOUND SIGNALS GENERATED BY TWO SOUND REPRODUCERS COMPRISING: MEANS FOR GENERATING DIFFERENT LEFT AND RIGHT ELECTRICAL SIGNAL REPRESENTATIVE OF DIFFERENT LEFT AND RIGHT SOUND SIGNALS; FIRST AND SECOND SEPARATE SIGNAL TRANSLATING CHANNELS RESPECTIVELY COUPLED TO SAID SOUND REPRODUCERS; MEANS FOR APPLYING ONLY ONE OF SAID ELECTRICAL SIGNALS TO SAID FIRST CHANNEL IN A PARTICULAR PHASE; MEANS FOR APPLYING THE OTHER OF SAID ELECTRICAL SIGNALS TO SAID SECOND CHANNEL IN A PARTICULAR PHASE; AND MEANS FOR SELECTIVELY APPLYING A PORTION OF SAID ONE SIGNAL INTO SAID SECOND CHANNEL TO DEVELOP THEREIN A SIGNAL CONTAINING SAID OTHER SIGNAL, AT A PREDETERMINED AVERAGE AMPLITUDE AND A PORTION OF SAID ONE SIGNAL, AT AN AVERAGE AMPLITUDE WHICH IS LESS THAN THAT OF SAID OTHER SIGNAL AND IN PHASE OPPOSITION TO THAT OF SAID ONE SIGNAL IN SAID FIRST CHANNEL, AND FOR SELECTIVELY APPLYING A PORTION OF SAID OTHER SIGNAL INTO SAID FIRST CHANNEL TO DEVELOP THEREIN A SIGNAL CONTAINING SAID ONE SIGNAL, AT A PREDETERMINED AVERAGE AMPLITUDE, AND A PORTION OF SAID OTHER SIGNAL, AT AN AVERAGE AMPLITUDE WHICH IS LESS THAN THAT OF SAID ONE SIGNAL AND IN PHASE OPPOSITION TO THAT OF SAID OTHER SIGNAL IN SAID SECOND CHANNEL, TO INCREASE THE APPARENT SEPARATION BETWEEN THE LEFT AND RIGHT SOUND SIGNALS GENERATED BY SAID REPRODUCERS IN RESPONSE TO SAID SIGNALS.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |