US4847904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ambient imaging loudspeaker system
Assignee: CHICAGO STEEL RULE DIE & FABRICATION Co A CORP OF
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Filing: 1988-04-01
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Granted: 1989-07-11
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Expires: 2008-04-01
Abstract
Abstract Sound reproduction apparatus comprising a pair of loudspeaker systems each including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals. Each system is mounted in an enclosure with sides and a gabled or V-shaped front portion characterized in having a pair of flat, vertical panels each joined to respective ones of the sides, the panels being joined at an intersecting angle to one another of about 90 to about 120 degrees at a forwardly projecting vertical ridge. Each system has a tweeter, woofer and mid-range speaker all connected for monophonically reproducing only a respective one of the stereophonic signals, and positioned in first ones of its panels. Each system also includes at least a second mid-range speaker connected for reproducing only a difference output between the stereophonic signals by using a dual voice coil driver, the second mid-range speaker being positioned in the other of its panels. When arranged side by side and spaced apart, the difference outputs are directed away from both speakers and the monophonic outputs are directed approximately toward one another. The entire apparatus is wired so that the monophonic R output produced by the one system is produced out-of-phase with the respective R component of the difference output of the associated second midrange speaker, and similarly the L output of the other system is out-of-phase with the respective L component of the difference output from its associated second midrange speaker.
Inventors
- 👤 Charles L. McShane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R1/00; H04R1/02; H04R1/20; H04R1/32; H04R1/40; H04R1/403; H04R5/00; H04R5/02; H04S; H04S1/00; H04S1/002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
Sound reproduction apparatus comprising: a first loudspeaker system including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals: at least a first of said loudspeakers being-connected for reproducing only one of said stereophonic signals; at least a second of said loudspeakers having a dual voice coil wired and connected for producing an audio output signal representing only the difference between the other of said stereophonic signals and said one of said stereophonic signals; and means for mounting said first loudspeaker for radiating sound along a first axis away from said second loudspeaker, and for mounting said second loudspeaker for radiating sound away from said first loudspeaker along a second axis at an acute angle to said first axis.
Claim 2
Dependent Claim
129 words
Sound reproduction apparatus comprising: a first loudspeaker system including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals: at least a first of said loudspeakers being-connected for reproducing only one of said stereophonic signals; at least a second of said loudspeakers having a dual voice coil wired and connected for producing an audio output signal representing only the difference between the other of said stereophonic signals and said one of said stereophonic signals; and means for mounting said first loudspeaker for radiating sound along a first axis away from said second loudspeaker, and for mounting said second loudspeaker for radiating sound away from said first loudspeaker along a second axis at an acute angle to said first axis.
Claim 3
Dependent Claim
166 words
Sound reproduction apparatus as defined in claim 1 including: a second loudspeaker system comprising a plurality of loudspeakers for producing audio signals in response to said electrical right (R) and left (L) stereophonic signals, at least one of said loudspeakers in said second loudspeaker system being connected for reproducing said other of said stereophonic signals; at least another of said loudspeakers in said second loudspeaker system having a dual voice coil wired and connected for producing an audio output signal representing the difference between said one of said stereophonic signals and said other of said stereophonic signals; and means for mounting said one of said loudspeakers for radiating sound along first axis away from said another loudspeaker, and for mounting said another loudspeaker for radiating sound away from said one of said loudspeakers of said second loudspeaker system along a second axis at an acute angle to said first axis; said first and second loudspeaker systems each being configured as the mirror image of the other.
Claim 4
Dependent Claim
20 words
Sound reproduction apparatus as defined in claim 1 wherein said acute angle is between about 60 to about 90 degrees.
Claim 5
Dependent Claim
21 words
Sound reproduction apparatus as defined in claim 2 wherein said acute angles are each between about 60 to about 90 degrees.
Claim 6
Dependent Claim
72 words
Sound reproduction apparatus as defined in claim 2 wherein said first and second loudspeaker systems are aligned so that the first axis of radiation along which sound is radiated by said first loudspeaker in said first loudspeaker system intersects the first axis of radiation along which sound is radiated by said at least one of loudspeakers in said second loudspeaker system at an angle of between about 60 to about 90 degrees.
Claim 7
Dependent Claim
66 words
Sound reproduction apparatus as defined in claim 2 wherein each of said mounting means of said first and second loudspeaker system comprises enclosure means with sides and having a gabled or V-shaped front portion characterized in having a pair of flat, vertical panels each joined to respective ones of said sides, and joined at an intersecting angle to one another at a forwardly projecting vertical ridge.
Claim 8
Dependent Claim
20 words
Sound reproduction apparatus as defined in claim 6 wherein said intersecting angle is between about 90 to about 120 degrees.
Claim 9
Dependent Claim
68 words
Sound reproduction apparatus as defined in claim 6 wherein said plurality of loudspeakers included in said first loudspeaker system includes: at least a woofer, a mid-range speaker and a tweeter all connected for reproducing only said one of said stereophonic signals, and positioned in one of said panels; and at least another mid-range speaker connected for reproducing only said difference, and positioned in the other of said panels.
Claim 10
Dependent Claim
40 words
Sound reproduction apparatus as defined in claim 1 wherein said voice coil comprises a pair of coils wound in a center-tapped, series wound, four layer design with each two layers of each coil comprising an independent left or right channel.
Claim 11
Dependent Claim
80 words
Sound reproduction apparatus as defined in claim 1 wherein said dual voice coil comprises first and second coils; said first coil being connected to receive said one of said stereophonic signals and to have a polarity opposite the polarity of said first of said loudspeakers of said first loudspeaker system; said second coil being connected to receive said other of said stereophonic signals and to have the same polarity as said first of said loudspeakers of said first loudspeaker system.
Claim 12
Dependent Claim
95 words
Sound reproduction apparatus as defined in claim 2 wherein said dual voice coil in said another of said loudspeakers in said second loudspeaker system comprises first and second coils; said first coil being connected to receive said other of said stereophonic signals and to have a polarity opposite the polarity of said at least one of said loudspeakers of said second loudspeakers systems; said second coil being connected to receive said one of said stereophonic signals and to have the same polarity as said at least one of said loudspeakers of said second loudspeaker system.
Claim 13
Dependent Claim
73 words
Sound reproduction apparatus as defined in claim 6 wherein said plurality of loudspeakers included in said second loudspeaker system includes: at least a woofer, a mid-range speaker and a tweeter all connected for reproducing only said other of said stereophonic signals, and positioned in one of said panels of said second loudspeaker system; and at least another mid-range speaker connected for reproducing only said difference, and positioned in said other of said panels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |