Stereophonic loudspeaker system
Abstract
Abstract A STEREOPHONIC LOUDSPEAKER SYSTEM IS PROVIDED COMPRISING TWO PAIRS OF LOUDSPEAKERS. EACH PAIR IS ORIENTED WITH THEIR AXES AT RIGHT ANGLES TO EACH OTHER AND SUBSTANTIALLY EQUIDISTANT FROM THE POINT OF INTERSECTION OF THE AXES. THE SPEAKERS ARE SO ARRANGED THAT ONE SPEAKER OF EACH PAIR FACES THE LISTENER AND THE OTHER SPEAKER HAS ITS AXIS SUBSTANTIALLY PERPENDICULAR TO THE LISTENER. MEANS ARE PROVIDED FOR MATRIXING THE SIGNALS PRODUCED BY A RIGHT AND LEFT AMPLIFIER SYSTEM TO PROVIDE A SUM SIGNAL AND A DIFFERENCE SIGNAL. SUM SIGNALS ARE APPLIED IN PHASE TO THE SPEAKERS WHOSE AXES ARE DIRECTED TOWARD THE LISTENER, AND DIFFERENCE SIGNALS ARE APPLIED TO THE SPEAKERS WHOSE AXES ARE POSITIONED AT RIGHT ANGLES WITH RESPECT TO THE DIRECTION OF THE LISTENER, THE DIFFERENCE SIGNALS TO THE TWO PERPENDICULAR SPEAKERS BEING APPLIED 180* OUT OF PHASE WITH EACH OTHER. AS A RESULT, A STEREOPHONIC SOUND EFFECT IS PRODUCED BY THE SYSTEM.
Inventors
- 👤 James P Holm
Bibliographic Details
Claims Analysis
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |