Patent US5590208A successfully refreshed from Google Patents.
US5590208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker system
Assignee: Pioneer Corp
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Filing: 1995-04-11
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Granted: 1996-12-31
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Expires: 2015-04-11
Abstract
Abstract A duct is provided in a cabinet for radiating sound pressure emitted from a speaker unit. The duct comprises a first duct and a second duct. The first duct extends in a direction perpendicular to a radiating direction of the sound pressure radiated from a front side of the speaker unit. The second duct is connected to an end of the first duct. An inner end of of the second duct is communicated with the cabinet. The speaker unit is disposed at a connection of the first and second ducts.
Inventors
- 👤 Shinji Koyano
- 👤 Koushirou Kogure
- 👤 Takashi Ohyaba
- 👤 Makoto Sakakibara
- 👤 Katsutoki Hanayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:43
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2838; H04R1/2842
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
206 words
A speaker system comprising: a cabinet; a first speaker unit provided within the cabinet; and a duct for radiating sound pressure emitted from the first speaker unit, wherein a drive signal to be applied to the speaker unit is passed through a network circuit means, said network circuit means for eliminating a high frequency component contained in the drive signal, wherein the duct extends in a direction perpendicular to a radiating direction of the sound pressure radiated from a front side of the first speaker unit, with one end of the duct being communicated with a space of the cabinet, and another end of the duct forming an opening of the speaker system; wherein the first speaker unit is disposed with the front side thereof positioned at a portion of a wall of the duct; wherein the duct has a cross section which is perpendicular to a sound propagating direction and has a consistent cross sectional area along an entire length thereof; and wherein sound pressure radiated from a rear side of the first speaker unit is propagated in the duct and applied to the sound pressure from the front side of the first speaker unit, and combined sound pressure is discharged outwardly from the duct.
Claim 2
Dependent Claim
206 words
A speaker system comprising: a cabinet; a first speaker unit provided within the cabinet; and a duct for radiating sound pressure emitted from the first speaker unit, wherein a drive signal to be applied to the speaker unit is passed through a network circuit means, said network circuit means for eliminating a high frequency component contained in the drive signal, wherein the duct extends in a direction perpendicular to a radiating direction of the sound pressure radiated from a front side of the first speaker unit, with one end of the duct being communicated with a space of the cabinet, and another end of the duct forming an opening of the speaker system; wherein the first speaker unit is disposed with the front side thereof positioned at a portion of a wall of the duct; wherein the duct has a cross section which is perpendicular to a sound propagating direction and has a consistent cross sectional area along an entire length thereof; and wherein sound pressure radiated from a rear side of the first speaker unit is propagated in the duct and applied to the sound pressure from the front side of the first speaker unit, and combined sound pressure is discharged outwardly from the duct.
Claim 3
Dependent Claim
20 words
The speaker system according to claim 1 wherein a second speaker unit is provided on the wall of the duct.
Claim 4
Dependent Claim
19 words
The speaker system according to claim 2, wherein the first and second speaker units are disposed in opposite directions.
Claim 5
Dependent Claim
19 words
The speaker system according to claim 1 wherein the duct is disposed in a central portion of the cabinet.
Claim 6
Dependent Claim
12 words
The speaker system according to claim 1 wherein the duct is horizontal.
Claim 7
Dependent Claim
12 words
The speaker system according to claim 1 wherein the duct is vertical.
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) | 1999-12-31 | 2000-07-01 | 2000-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-31 | 2004-07-01 | 2004-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-31 | 2008-07-01 | 2008-12-31 | $7700.00 | Window Closed / Lapsed |