Patent US3816672A successfully refreshed from Google Patents.
US3816672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproduction system
Assignee: Individual
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Filing: 1973-01-15
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Granted: 1974-06-11
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Expires: 1993-01-15
Abstract
Abstract A sound system for reproducing the full frequency spectrum of recorded sound throughout a listening environment at its natural volume and in the same spatial relationships as the originally created sound includes a multidirectional main audio driver utilizing the convex area of a conical shell diaphragm integrated with an acoustically reflective throating inertial regulator disk to provide spatial acoustic coupling between the audio driver and the atmosphere that approximates a live performance. The regulator disk is a rigid reflective plate mounted in a plane which forms an interior angle between 45* and 75* with the axis of the conic diaphragm. The plate may be flat, or shaped hyperbolically or exponentially. It may be either integral with the conical diaphragm assembly or separate and attached by external means. A bass equalization device comprising a tube of controlled inertance having an acoustically resistive network inserted therein amplifies the output from the convex radiating surface of the audio driver and equalizes the bass and upper frequency audio power output. It also serves to cancel the outof-phase upper frequency sound waves generated by the concave radiating surface. The bass equalization device and the inertance regulator disk control the resonant frequency and inertance of the system. The bass frequency output faces a cabinet enclosure equalized without resonance so that 12 through 512 Hz. is generated without spurious harmonic partials or parasitic frequency components. Horizontal-radial and vertical dispersion speakers, comprising high frequency response speakers, are vertically oriented and face a conic, hyperbolic or exponential throating and inertance regulated dispersion surface for a full spatial distribution of the upper frequency audio output. The sound reproduction system may further be described as an inertially regulated sonic transducer. By controlling the diaphragm velocity and acoustic expansion rate audio reproduction can be recreated that approximates the spatial perspective of a live performance.
Inventors
- 👤 H Gefvert
- 👤 K Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:09
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345; H04R1/22; H04R1/26
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
216 words
A system for reproducing sound throughout a listening environment including: a. a hollow flexible main audio driver including a conical radiating member having a small and a large end axially aligned with each other, and defining an inner concave sound radiating surface and an outer convex sound radiating surface; b. driving means directly coupled to said small end for mechanically driving said radiating member; c. a relatively rigid reflective member essentially the same diameter as the large end of the conical radiating member disposed at an angle to the axis of said conical radiating member, adjacent said small end, the angle between the outer surface of said radiating member and the reflective member being between about 45* and 75*; d. tubular sound conducting conduit and bass equalizing means cooperatively mounted to receive sound energy from the concave inner surface of the large end of the conical driver so that the outer convex surface of said conical radiating member is freely exposed for direct electroacoustic coupling to the surrounding environment and the reflective member, the inner concave surface of said conical radiating member being isolated from the surrounding environment by said conduit; e. said outer surface and said reflective member cooperating to direct sound waves produced at the outer surface of said radiating member radially outwardly thErefrom.
Claim 2
Independent Claim
216 words
A system for reproducing sound throughout a listening environment including: a. a hollow flexible main audio driver including a conical radiating member having a small and a large end axially aligned with each other, and defining an inner concave sound radiating surface and an outer convex sound radiating surface; b. driving means directly coupled to said small end for mechanically driving said radiating member; c. a relatively rigid reflective member essentially the same diameter as the large end of the conical radiating member disposed at an angle to the axis of said conical radiating member, adjacent said small end, the angle between the outer surface of said radiating member and the reflective member being between about 45* and 75*; d. tubular sound conducting conduit and bass equalizing means cooperatively mounted to receive sound energy from the concave inner surface of the large end of the conical driver so that the outer convex surface of said conical radiating member is freely exposed for direct electroacoustic coupling to the surrounding environment and the reflective member, the inner concave surface of said conical radiating member being isolated from the surrounding environment by said conduit; e. said outer surface and said reflective member cooperating to direct sound waves produced at the outer surface of said radiating member radially outwardly thErefrom.
Claim 3
Dependent Claim
18 words
A sound reproducing system as claimed in claim 1 wherein said reflective member is a circular, plane disk.
Claim 4
Dependent Claim
31 words
A sound reproducing system as claimed in claim 2 wherein said reflective member has a diameter between three/fifths and seven/fifths of the diameter of said large end of said radiating member.
Claim 5
Dependent Claim
29 words
A sound reproducing system as claimed in claim 3, in which said reflective member is formed with a surface of revolution coaxial with the axis of said radiating member.
Claim 6
Dependent Claim
26 words
A sound reproducing system as claimed in claim 4, wherein the intersection of said surface of revolution with a plane including said axis is a curve.
Claim 7
Dependent Claim
67 words
A sound reproducing system as claimed in claim 1, wherein said base equalization means comprises a closed tube having a length substantially greater than its width, such that the resonant frequency of said tube is a function of said tube length, and acoustic network means supported within said tube and dividing said tube into two separate lengths for controlling the acoustic response of said bass equalization device.
Claim 8
Dependent Claim
38 words
A sound reproducing system as claimed in claim 6 in which the acoustic distance from said radiating member to the end of said tube is approximately one/quarter of the wavelength of the resonant frequency of said radiating member.
Claim 9
Dependent Claim
40 words
A sound reproducing system as claimed in claim 7 in which the inner surface of said tube is lined with an acoustically absorbent material adapted to attenuate high frequency sound waves generated by the inner surface of said radiating member.
Claim 10
Dependent Claim
20 words
A sound reproducing system as claimed in claim 8 in which said sound absorbent material is a porous polyurethane material.
Claim 11
Dependent Claim
42 words
A sound reproducing system as claimed in claim 6 in which said acoustic network means is positioned within said tube at a distance from the large end of said radiating member of between three/fifths and two/thirds of the length of said tube.
Claim 12
Dependent Claim
63 words
A sound reproducing system as claimed in claim 6 in which said acoustic network means comprises a plurality of layers of microporous acoustic damping material in a sandwich array such that said network provides acoustic resistance to the passage of low frequency sound waves generated by the inner radiating surface response and extending the overall frequency response range of said bass equalization device.
Claim 13
Dependent Claim
47 words
A sound reproducing system as claimed in claim 1 including an electroacoustic transducer for reproducing high frequency sound waves of 2,500 Hz. and above, and a dispersion member facing said transducer, said transducer and dispersion member cooperating to disperse said high frequency sound waves radial outwardly therefrom.
Claim 14
Dependent Claim
25 words
A sound reproducing system as claimed in claim 12 wherein said dispersion member is formed with a surface of revolution coaxial with said electroacoustic transducer.
Claim 15
Dependent Claim
31 words
A sound reproducing system as claimed in claim 13, wherein the intersection of said surface of revolution with a plane including the axis of said dispersion member is a circular arc.
Claim 16
Dependent Claim
48 words
A sound reproducing system as claimed in claim 12 in which said electroacoustic transducer includes a permanent magnet and said dispersion surface has an apex, said apex being mechanically coupled to said magnet so that said magnet supports said dispersion surface in substantially coaxial relationship with said transducer.
Claim 17
Dependent Claim
38 words
A sound reproducing system as claimed in claim 12, including an absorbing member surrounding said dispersion member and absorbing a portion of said high frequency sound waves dispersed in a plane transverse to the axis of said transducer.
Claim 18
Dependent Claim
86 words
A system as claimed in claim 1 for reproducing sound throughout a listening environment comprising an audio driver and a bass equalization device, said equalization device comprising a tube having an open end juxtaposed with said driver and a length substantially greater than its width, such that the resonant frequency of said tube is a function of the tube length, and acoustic network means disposed within said tube and dividing said tube into two separate lengths for controlling the acoustic response of said bass equalization device.
Claim 19
Dependent Claim
36 words
A sound reproducing system as claimed in claim 17 in which the distance from said driver to the opposite end of said tube is approximately one/quarter of the wavelength of the resonant frequency of said driver.
Claim 20
Dependent Claim
37 words
A sound reproducing system as claimed in claim 17 in which said acoustic network means is positioned within said tube at a distance from said driver of between three/fifths and two/thirds of the length of said tube.
Claim 21
Dependent Claim
60 words
A sound reproducing system as claimed in claim 17 in which said acoustic network means comprises a plurality of layers of microporous acoustic damping material in a sandwich array such that said network provides acoustic resistance to the passage of low frequency sound waves generated by said driver and extending the overall frequency response range of said bass equalization device.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |