US4224469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo speaker system
Assignee: Individual
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Filing: 1979-01-02
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Granted: 1980-09-23
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Expires: 1999-01-02
Abstract
Abstract An acoustic speaker system suitable for use with a home stereo system has a bass speaker, a super-tweeter speaker, a tweeter speaker and a midrange speaker. The speakers are disposed in a generally ascending arrangement with the bass speaker occupying the bottom position, the super-tweeter speaker mounted immediately above the bass speaker, the tweeter speaker mounted immediately above the super-tweeter speaker and the midrange speaker mounted above the tweeter speaker. Speakers for left and right channels of a stereo system are disposed in mirror image in two enclosures. The bass speaker is enclosed in a folded trapezoidal transmission line, and the midrange and tweeter speaker are also housed in transmission line enclosures. A second embodiment contains speakers for both channels in one speaker system disposed in mirror arrangement about a diagonal axis, along a flattened S-shaped curve. An adjustable tuning mechanism is provided for fine tuning the bass transmission line enclosure.
Inventors
- 👤 Theodore R. Karson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2853; H04R1/2857; H04R1/26; H04R5/00; H04R5/02; H04R2205/00; H04R2205/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
212 words
A speaker useable in a stereo speaker system, said speaker having an enclosure comprising: a bottom; a top; two vertical sides; a front panel; a back panel; said front panel having a plurality of holes for respectively receiving a bass speaker, a midrange speaker, a tweeter speaker, and a super-tweeter speaker; said bass speaker generally centrally disposed in said front panel; said midrange speaker, tweeter speaker and super-tweeter speaker disposed along a line in the shape of a crescent with said midrange speaker disposed at a top of said crescent shaped line nearest said top of said speaker enclosure, and said super-tweeter speaker disposed at a bottom of said crescent shaped line nearest a vertical side and said bass speaker, and said tweeter speaker disposed on said crescent shaped line between said midrange speaker and said super-tweeter speaker; a non-resonant cavity inside said enclosure having a wall in which said bass speaker is mounted and which is of sufficient length to substantially prevent resonance of audio signals produced by said bass speaker, at least a portion of said non-resonant cavity having a trapezoidal cross-sectional shape in a plane parallel to said bottom; and a tuning means connected to said enclosure for connecting said bass non-resonant cavity with the exterior of said enclosure.
Claim 2
Dependent Claim
212 words
A speaker useable in a stereo speaker system, said speaker having an enclosure comprising: a bottom; a top; two vertical sides; a front panel; a back panel; said front panel having a plurality of holes for respectively receiving a bass speaker, a midrange speaker, a tweeter speaker, and a super-tweeter speaker; said bass speaker generally centrally disposed in said front panel; said midrange speaker, tweeter speaker and super-tweeter speaker disposed along a line in the shape of a crescent with said midrange speaker disposed at a top of said crescent shaped line nearest said top of said speaker enclosure, and said super-tweeter speaker disposed at a bottom of said crescent shaped line nearest a vertical side and said bass speaker, and said tweeter speaker disposed on said crescent shaped line between said midrange speaker and said super-tweeter speaker; a non-resonant cavity inside said enclosure having a wall in which said bass speaker is mounted and which is of sufficient length to substantially prevent resonance of audio signals produced by said bass speaker, at least a portion of said non-resonant cavity having a trapezoidal cross-sectional shape in a plane parallel to said bottom; and a tuning means connected to said enclosure for connecting said bass non-resonant cavity with the exterior of said enclosure.
Claim 3
Dependent Claim
101 words
The speaker of claim 1 wherein said bass non-resonant cavity consists of two adjacent folded upright portions connected by a horizontal reflecting area, one of said upright portions having the bass speaker mounted therein, said reflecting area having two reflecting planar members each attached at an angle at a first side to said front panel and at a second opposite side to said speaker bottom, said reflecting planar members mounted beneath said upright portions such that sound from said bass speaker travels down a first non-resonant cavity portion, horizontally through said reflecting area, and upward along a second non-resonant cavity portion.
Claim 4
Dependent Claim
36 words
The speaker of claim 2 wherein the reflecting planar member beneath the first non-resonant cavity portion makes a greater angle with said speaker bottom than does the reflecting planar member beneath the second non-resonant cavity portion.
Claim 5
Dependent Claim
66 words
The speaker of claim 2 wherein a baffle is mounted on one of said vertical sides of said speaker enclosure in the second non-resonant cavity portion, said baffle extending partially into said non-resonant cavity and mounted upwardly at an angle from said vertical side, and at a distance from said top of said speaker equal to approximately 1/4 of a total length of said vertical side.
Claim 6
Dependent Claim
70 words
The speaker of claim 1 wherein said tuning means comprises: a frame; a cover carried immovably inside said frame; and a vertically movable tuner slidably carried inside said frame, said tuner comprised of sound insulating material, such that vertical movement of said tuner selectively varies an operable portion of said cover through which air mass may be transmitted from said bass non-resonant cavity to the exterior of the speaker enclosure.
Claim 7
Dependent Claim
98 words
The speaker of claim 1 wherein said tuning means is a tuner, said tuner comprising: a stationary cylindrical portion immovably mounted in said front panel and extending into the bass non-resonant cavity; and a horizontally movable second cylindrical portion, said second cylindrical portion having an outer diameter slightly smaller than an inner diameter of said stationary portion such that said second portion may be slidably engaged inside said first portion, whereby said second portion may be selectively adjusted to vary the amount of air pressure transmitted from the bass non-resonant cavity to the exterior of the speaker enclosure.
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) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |