US3759345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic sound-reproducing system
Assignee: Individual
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Filing: 1971-12-22
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Granted: 1973-09-18
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Expires: 1991-12-22
Abstract
Abstract A stereophonic sound-reproducing system comprising two soundreproducing sets separated by a base distance and each having a high-frequency section and a mid frequency section. The mid frequency section is provided with an acoustic focuser, the acoustic axis of which is so oriented towards the base line as to make the perception of the spatial sound panorama practically independent of the listener''s position on a line parallel to the base line.
Inventors
- 👤 Borisenko A Vladimirovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:14
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A stereophonic-sound reproducing system comprising: two sound-reproducing units symmetrically positioned on a base line and separated by a base distance, each unit having a midfrequency section and a high-frequency section, and acoustic focussing means positioned in front of said mid-frequency section, each mid-frequency section having an acoustic axis inclined with respect to the base line, the acoustic axes of both mid-frequency sections facing inwardly in converging fashion and intersecting on an axis of symmetry of the units, each acoustic focussing means comprising a plurality of spaced vertical plates extending parallel to the acoustic axis of the respective midfrequency section, said plates having a length in a horizontal plane which decreases with increased distance of the plates from said axis of symmetry, whereby to make the perception of the spatial sound panorama produced by said units practically independent of the listener''s position on a line parallel to the base line.
Claim 2
Dependent Claim
149 words
A stereophonic-sound reproducing system comprising: two sound-reproducing units symmetrically positioned on a base line and separated by a base distance, each unit having a midfrequency section and a high-frequency section, and acoustic focussing means positioned in front of said mid-frequency section, each mid-frequency section having an acoustic axis inclined with respect to the base line, the acoustic axes of both mid-frequency sections facing inwardly in converging fashion and intersecting on an axis of symmetry of the units, each acoustic focussing means comprising a plurality of spaced vertical plates extending parallel to the acoustic axis of the respective midfrequency section, said plates having a length in a horizontal plane which decreases with increased distance of the plates from said axis of symmetry, whereby to make the perception of the spatial sound panorama produced by said units practically independent of the listener''s position on a line parallel to the base line.
Claim 3
Dependent Claim
30 words
A stereophonic sound-reproducing system as claimed in claim 1, wherein said plates are disposed at an angle of 40* relatiVe to said base line, the latter being 2.4 m long.
Claim 4
Dependent Claim
47 words
A stereophonic sound-reproducing system as claimed in claim 1, wherein each said high-frequency section is oriented relative to the base line so that the acoustic axis of said high-frequency section is at approximately the same angle to the base line as that of the associated mid-frequency section.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |