US4233472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker combination, comprising a plurality of dynamic loudspeakers, which are arranged adjacent each other in substantially one continuous plane
Assignee: US Philips Corp
•
Filing: 1978-07-13
•
Granted: 1980-11-11
•
Expires: 1998-07-13
Abstract
Abstract A loudspeaker combination comprising a plurality of sections of dynamic loudspeakers which are arranged adjacent each other in substantially one continuous plane. A number of these sections can be muted at increasing frequency under the influence of a low-pass filter. All loudspeaker sections are connected in series with each other and each mutable loudspeaker section is shunted by a capacitor. Each low-pass filter is constituted by the impedance of a mutable loudspeaker section with the associated capacitor. One loudspeaker section is not shunted by a capacitor and comprises at least two loudspeakers with the axes of the loudspeakers diverging relative to each other. This has the advantage that the loudspeaker combination has a virtually constant angle of aperture over a wide frequency range.
Inventors
- 👤 Derk Kleis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/12; H04R1/00; H04R1/20; H04R1/32; H04R1/40; H04R1/403; H04R2430/00; H04R2430/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A loudspeaker system comprising, a pair of input terminals, a plurality of dynamic loudspeakers arranged in sections with the loudspeakers adjacent each other in substantially one continuous plane and all sections connected in series across said input terminals, a plurality of capacitors, means connecting a capacitor in shunt with each loudspeaker section but one so as to form respective low-pass filters with the respective impedances of the loudspeaker sections, said low-pass filters having different cut-off frequencies to provide progressive muting of the loudspeaker sections as the frequency increases, and said one loudspeaker section comprises at least two loudspeakers with the axes thereof diverging relative to each other.
Claim 2
Dependent Claim
107 words
A loudspeaker system comprising, a pair of input terminals, a plurality of dynamic loudspeakers arranged in sections with the loudspeakers adjacent each other in substantially one continuous plane and all sections connected in series across said input terminals, a plurality of capacitors, means connecting a capacitor in shunt with each loudspeaker section but one so as to form respective low-pass filters with the respective impedances of the loudspeaker sections, said low-pass filters having different cut-off frequencies to provide progressive muting of the loudspeaker sections as the frequency increases, and said one loudspeaker section comprises at least two loudspeakers with the axes thereof diverging relative to each other.
Claim 3
Dependent Claim
31 words
A loudspeaker system as claimed in claim 1 wherein at least one of the loudspeaker sections shunted by a capacitor further comprises an incandescent lamp connected in series with the capacitor.
Claim 4
Dependent Claim
47 words
A loudspeaker system as claimed in claim 1 wherein said loudspeakers are aligned in a single straight line column and said one section comprises the central section of the column, the system further comprising means connecting all of the loudspeakers in series circuit across said input terminals.
Claim 5
Dependent Claim
87 words
A loudspeaker system as claimed in claims 1 or 2 wherein at least two loudspeaker sections each includes two loudspeakers with each loudspeaker shunted by an individual capacitor, the capacitance values of the capacitors of one loudspeaker section being equal to one another and the capacitance values of the capacitors of a second loudspeaker section also being equal to one another but unequal to the capacitance values of the capacitors of said one loudspeaker section thereby to form first and second low-pass filters having different cut-off frequencies.
Claim 6
Dependent Claim
58 words
A loudspeaker system as claimed in claims 1 or 2 wherein at least two loudspeaker sections each include two loudspeakers with each loudspeaker section shunted by an individual capacitor, the capacitance values of the capacitors of the two loudspeaker sections being chosen so as to form at least first and second respective low-pass filters having different cut-off frequencies.
Claim 7
Dependent Claim
79 words
A loudspeaker system as claimed in claims 1 or 2 wherein at least two loudspeaker sections each include two parallel connected loudspeakers and means connecting a first loudspeaker of each of said two loudspeaker sections in a first series circuit across the input terminals and a second loudspeaker of each of said two loudspeaker sections in a second series circuit across the input terminals and with said first and second series circuits connected in parallel across the input terminals.
References Cited (Backward Citations)
GB1122851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |