Patent US4658932A successfully refreshed from Google Patents.
US4658932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simulated binaural recording system
Assignee: Harman International Industries Inc
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Filing: 1986-02-18
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Granted: 1987-04-21
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Expires: 2006-02-18
Abstract
Abstract A microphone system comprising a pair of microphone capsules, a pair of planar barriers positioned at an angle to each other, with each microphone capsule secured to the center portion of a barrier positioned between the microphone capsules. A baffle is positioned between the microphones with the sidewalls of the baffle extending angularly toward the barriers forming corners with each of the microphone capsules located at the corner.
Inventors
- 👤 Michael S. J. C. Billingsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:22
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/027
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
90 words
A microphone system, comprising: a pair of microphones, each of said microphones comprising a capsule; means forming a pair of planar barriers positioned at an angle to each other; means securing each of said microphone capsules adjacent separate ones of said barriers at spaced apart distances; and an acoustic baffle positioned between said microphones, means connecting said baffle to each of said barriers, said baffle having a plurality of sidewalls, and wherein at least one of said sidewalls extends angularly toward one of said barriers and forms a corner therewith.
Claim 2
Dependent Claim
90 words
A microphone system, comprising: a pair of microphones, each of said microphones comprising a capsule; means forming a pair of planar barriers positioned at an angle to each other; means securing each of said microphone capsules adjacent separate ones of said barriers at spaced apart distances; and an acoustic baffle positioned between said microphones, means connecting said baffle to each of said barriers, said baffle having a plurality of sidewalls, and wherein at least one of said sidewalls extends angularly toward one of said barriers and forms a corner therewith.
Claim 3
Dependent Claim
20 words
A microphone system according to claim 1 wherein said microphone capsules are each positioned proximate to each of said corners.
Claim 4
Dependent Claim
26 words
A microphone system according to claim 1 wherein the pair of planar barriers are positioned at an angle of between 60° and 140° to each other.
Claim 5
Dependent Claim
16 words
A microphone system according to claim 1 wherein the baffle may be composed of porous material.
Claim 6
Dependent Claim
15 words
A microphone system according to claim 4 wherein the porous material is acoustically absorbing foam.
Claim 7
Dependent Claim
16 words
A microphone system according to claim 1 wherein the baffle may be composed of non-porous material.
Claim 8
Dependent Claim
15 words
A microphone system according to claim 6 wherein the non-porous material is acoustically reflective metal.
Claim 9
Dependent Claim
31 words
A microphone system according to claim 1 wherein each of the barriers is positioned at an angle of between 80° and 140° to each of the side walls of the baffle.
Claim 10
Dependent Claim
21 words
A microphone system according to claim 8 wherein the angle formed between the baffle and each of the barriers is equal.
Claim 11
Dependent Claim
21 words
A microphone system according to claim 1 wherein the distance between said microphone capsules is between 5.5 inches and 8.0 inches.
Claim 12
Dependent Claim
13 words
A microphone system according to claim 1 wherein said microphone capsules are omnidirectional.
Claim 13
Dependent Claim
16 words
A microphone system according to claim 1 wherein said barriers are composed of sound reflecting material.
Claim 14
Dependent Claim
29 words
A microphone system according to claim 1 wherein the baffle is shaped so as to prevent high frequency phase cancellation from occurring in summed signals from said microphone capsules.
Claim 15
Dependent Claim
20 words
A microphone system according to claim 1 wherein said baffle has a depth of between 2 inches and 48 inches.
Claim 16
Dependent Claim
20 words
A microphone system according to claim 1 wherein said barriers have a height of between 2 inches and 4 feet.
Claim 17
Dependent Claim
56 words
A system as set forth in claim 1 wherein said microphone capsules are omnidirectional and are spaced apart a distance of approximately 5.5 to 8 inches, said planar barriers are positioned at an angle of between about 60° and 140°, and with said baffle simulating the frontal hemisphere of a human head between said microphone capsules.
Claim 18
Dependent Claim
40 words
A system as set forth in claim 16 wherein said barriers are formed of sound absorbing material, and said baffle is formed of sound absorbing material which attenuates frequencies above 1200 Hz by a minimum of 3 db per inch.
Claim 19
Dependent Claim
101 words
A microphone system comprising: a pair of microphones, each of said microphones comprising a capsule; means forming a pair of planar barriers positioned at an angle to each other, each of said barriers having an aperture through which one of said microphone capsules projects; means securing each of said microphones to separate ones of said barriers; and an acoustic baffle positioned between said microphone capsules, means connecting said baffle to each of said barriers, said baffle having a plurality of sidewalls, and wherein at least one of said sidewalls extends angularly toward one of said barriers and forms a corner therewith.
Claim 20
Dependent Claim
101 words
A microphone system comprising: a pair of microphones, each of said microphones comprising a capsule; means forming a pair of planar barriers positioned at an angle to each other, each of said barriers having an aperture through which one of said microphone capsules projects; means securing each of said microphones to separate ones of said barriers; and an acoustic baffle positioned between said microphone capsules, means connecting said baffle to each of said barriers, said baffle having a plurality of sidewalls, and wherein at least one of said sidewalls extends angularly toward one of said barriers and forms a corner therewith.
Claim 21
Dependent Claim
24 words
A microphone system according to claim 18 wherein each of said microphone capsules has a diaphragm means positioned proximate to each of said corners.
Claim 22
Dependent Claim
52 words
A microphone system according to claims 1 or 18, wherein each of said barriers has a rear edge and said baffle has a vertical edge forward of said rear edges, and further comprising a screen extending from a rear edge of one of said barriers to a vertical edge of the baffle.
Claim 23
Dependent Claim
32 words
A microphone system according to claims 1 or 18, wherein said baffle is composed of sound absorbing material which attenuates frequencies above 1200 Hz by a minimum of 3 dB per inch.
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) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |