US3895194A - Directional condenser electret microphone - Google Patents
Directional condenser electret microphone Download PDFInfo
- Publication number
- US3895194A US3895194A US364984A US36498473A US3895194A US 3895194 A US3895194 A US 3895194A US 364984 A US364984 A US 364984A US 36498473 A US36498473 A US 36498473A US 3895194 A US3895194 A US 3895194A
- Authority
- US
- United States
- Prior art keywords
- backplate
- circuit board
- diaphragm
- passageway
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/04—Structural association of microphone with electric circuitry therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
Definitions
- a miniature condenser microphone incorporates an assembly of a backplate, a diaphragm and an electrical [52] Us. Cl l79/l21 R; 179M H E; 179/121 D circuit board mounted within a housing to divide the s 1 Int.
- This invention provides a miniature condenser microphone of improved construction which is characterized by a high standard of performance and low production cost.
- a backplate having a diaphragm mounted on and spaced from one side thereof and an'electrical circuit board mounted on the other side forms a compact assembly which, when installed in a housing, forms a front air volume adjacent the diaphragm and'a back air volume adjacent the circuit board.
- a groove in the surface of the backplate adjacent the electrical circuit board establishes a fluid communication path between the space intermediate the diaphragm and the backplate and the rear air volume.
- the rear air volume acts as a resonance chamber.
- the groove and the electrical circuit board cooperate to form a constriction in the fluid communication path to damp the diaphragm and provide the desired performance characteristics.
- FIG. 1 is a cut-away, perspective view showing a preferred embodiment of the invention
- FIG. 2 is an exploded perspective view of the appara tus as shown in FIG. I.
- the miniature microphone incorporates a housing 12 comprised of an electrically conductive front member 14 and a rear member 16.
- the miniature housing 12 measures slightly less than 0.10 inches in thickness and has a face area of approximately 0.22 X 0.31 inches.
- an assembly 18 comprising a backplate 20, a diaphragm 22 and a board 24 having an electrical circuit thereon.
- the backplate 20 formed of injection molded thermoplastic material, has a peripheral ridge 26 extending from an obverse face.
- the diaphragm 22 is mounted on the ridge 26and spaced from the backplate by a distance equal to the height of the ridge 26.
- a pair of posts 28 are provided. The posts approximately equal or slightly exceed the height of the ridge 26.
- a working gap 30 is formed, between the backplate and the diaphragm.
- a recess 32 for receiving the circuit board 24.
- the configuration of the recessed area conforms substantially to the configuration of the circuit board, except that along one portion thereof a portion of the recess 32 extends beyond the board 24 to form an open area 34.
- the circuit board 24 is securely bonded to the backplate 22 by an epoxy resin 66.
- a plurality of holes 36 extend through the backplate and communicate between the working gap and the recess area 32.
- a system of grooves 38 in the reverse side of the backplate 20 connects the holes 36 and extends into the open area 34.
- the epoxy resin 66 is positioned not to block the constriction formed by the grooves 38 which connect the holes 36 with the open area 34.
- the diaphragm 22 comprises an electret 42 having thereon a coating 44 of electrically conductive material, such as gold.
- the electret is described in US. Pat. No. 3,6l2,778 titled ElectretAcoustic Transducer and Method-of Making.
- Thediaphragm is mounted on the backplate by firmly securing the electret along the ridge 26 with the coating 44 facing away from the backplate 20.
- the circuit board 24 is mounted in the recess 32with the side bearing electrical components means 46 facing away from the backplate.
- a relatively smooth side 48 seats within the recess 34.
- a plurality of leads 50 extend from the circuit board for connection to a terminal board 52 mounted on the housing 12.
- the assembly 18 is mounted within the housing 12 to form a first or front air chamber 54 adjacent the front housing member 14 and a second or rear air chamber 56 adjacent the rear housing member 16.
- the spacing is accomplished by a ring 58 and a resilient gasket 60.
- the ring 58 is plastic with an electrically conductive coating 62. It establishes electrical connection between the diaphragm and the front member 14.
- the resilient gasket 60 spaces the assembly 18 from the rear member 16 and loads the assembly so that it is pressed towards the front member 14.
- Means 68 extends from the front housing member 14 to form a front sound inlet port 70, communicating with front air chamber 54 through an opening 64 in the ring 58.
- the rear air chamber 56 acts as a resonance chamber. It is in fluid communication with the working gap 30 through the holes 36 and the grooves 38.
- the grooves 38 and the surface 48 of the circuit board 24 form a air passageway which constitutes a constriction in the fluid communication path between the working gap 30 and the rear air chamber 56 to damp the diaphragm 22.
- the character of the passageway formed by the grooves 38 and the surface 48 determines the amount of damping which occurs. It will be appreciated that the size of the grooves as well as its length are the fundamental parameters which may conveniently be designed to provide a desired damping action.
- the microphone 10 may have a second sound inlet port 74 to provide a directional characteristic.
- Port 74 alone will establish essentially bidirectional operation. If the port is covered by acoustical resistance material 80, spaced from rear member 16 by spacer 76 having opening 78 therein, a unidirectional characteristic preferential to the front is established.
- a miniature condenser microphone including a housing enclosing an electret diaphragm and a minia ture electrical circuit to electrically connect the dia phragm with means external of said housing, said microphone comprising:
- said backplate inclildin'g at least one air passageway mean's.
- an imperforate electrical circuit board supporting said miniature electrical circuit said board being mounted on the reverse side of said backplate confronting all said air passageway means along the reverse side of said backplate and partially exposing the reverse side of said backplate, said backplate mating with said board to form a constrictive passageway along the confronting surfaces thereof, said constrictive passageway having an open end at an edge of said board confronting said backplate; said backplate, diaphragm and circuit board forming an assembly; means mounting said assembly in said housing for dividing the interior thereofinto a first air space adjacent said diaphragm along the surface thereof facing away from said working gap and a second air space adjacent said circuit board, said second air space communicating with said working gap through said open end, said constrictive channel and said air passageway means; and 7 means forming in said housing a sound inlet port to said first air space.
- said air passageway means comprises means forming at least one hole in said backplate and wherein said constrictive passageway is formed by a groove extending from said hole between the reverse side of said backplate and said circuit board.
- a miniature condenser microphone according to claim 1 wherein said air passageway means comprises means forming a plurality of holes in said backplate and wherein said constrictive passageway is formed by the combination of said circuit board and groove means along the reverse side of said backplate joining said holes, said circuit board fronting a part of said groove means.
- a miniature condenser microphone according to claim 3 further comprising a recess in the reverse side of said backplate for receiving said circuit board.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
A miniature condenser microphone incorporates an assembly of a backplate, a diaphragm and an electrical circuit board mounted within a housing to divide the housing into front and back air volumes. The front air volume is adjacent the diaphragm and communicates with a sound inlet port. The rear air volume is adjacent the backplate and communicates with a working gap between the diaphragm and the backplate through a damping constriction formed by the backplate and the electrical circuit board.
Description
United States Patent 1191 B Mir/W360 1111 3,895,194
Fraim July 15, 1975 [54] fi iiggggg CONDENSER ELECTRET FOREIGN PATENTS OR APPLICATIONS 879,857 3/1943 France l79/lll [75] Inventor: Freeman W. Fraim, Lexington,
Mass- Primary Examiner-Kathleen l-l. Claffy [73] Assignee: Thermo Electron Corporation, Assistant Examiner'c'eorge Stellar waltham, Mass Attorney, Agent, or FirmJames L. Neal [22] Filed: May 29, 1973 57 ABSTRACT [2]] Appl. NO- 36 ,9 A miniature condenser microphone incorporates an assembly of a backplate, a diaphragm and an electrical [52] Us. Cl l79/l21 R; 179M H E; 179/121 D circuit board mounted within a housing to divide the s 1 Int. Cl H04r 1/38; H04r 19/04 hwsmg 3 and volumes- The from air 58 Field of Search 179/111 R, 111 E, 121 D, Wlume adlecem dlaphragm P cmmu,nicat es 179/l DM, 178 179 307/88 ET with a sound Inlet port. The rear air volume is ad acent the backplate and communicates with a working gap between the diaphragm and the backplate through [56] References Cited a damping constriction formed by the backplate and UNITED STATES PATENTS the electrical circuit board. 3,300,585 H1967 Reedyk et a1. 179/111 R 3,777,079 12/1974 Fischer et al. 179/121 D 4 Clams, 2 Drawing Flgures i 1 A /l/ y 63 1 1 74 78 76 16 24 56 34 32 6O PMENTEQJUL 15 1915 24 5e 34 32 m gg 1 DIRECTIONAL CONDENSER ELECTRET MICROPHONE c oss REFERENCE TO RELATED APPLICATION This application discloses subject matter similar to that appearing in application Ser. No. 364,997 filed May 29, 1973 for Unidirectional Condenser Microphone in the names of Freeman W. Fraim, Preston V. Murphy and Alan P. Woodward.
BRIEF SUMMARY OF THE INVENTION This invention provides a miniature condenser microphone of improved construction which is characterized by a high standard of performance and low production cost. A backplate having a diaphragm mounted on and spaced from one side thereof and an'electrical circuit board mounted on the other side forms a compact assembly which, when installed in a housing, forms a front air volume adjacent the diaphragm and'a back air volume adjacent the circuit board. A groove in the surface of the backplate adjacent the electrical circuit board establishes a fluid communication path between the space intermediate the diaphragm and the backplate and the rear air volume. The rear air volume acts as a resonance chamber. The groove and the electrical circuit board cooperate to form a constriction in the fluid communication path to damp the diaphragm and provide the desired performance characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cut-away, perspective view showing a preferred embodiment of the invention;
FIG. 2 is an exploded perspective view of the appara tus as shown in FIG. I.
DETAILED DESCRIPTION OF THE DRAWINGS Referring to FIGS. l and 2, the miniature microphone incorporates a housing 12 comprised of an electrically conductive front member 14 and a rear member 16. In a preferred embodiment. the miniature housing 12 measures slightly less than 0.10 inches in thickness and has a face area of approximately 0.22 X 0.31 inches. Within the housing 10 is mounted an assembly 18 comprising a backplate 20, a diaphragm 22 and a board 24 having an electrical circuit thereon.
The backplate 20, formed of injection molded thermoplastic material, has a peripheral ridge 26 extending from an obverse face. The diaphragm 22 is mounted on the ridge 26and spaced from the backplate by a distance equal to the height of the ridge 26. To avoid contact between the backplate and the diaphragm during operation of the microphone, a pair of posts 28 are provided. The posts approximately equal or slightly exceed the height of the ridge 26. There is formed, between the backplate and the diaphragm, a working gap 30. In the reverse side of the backplate is a recess 32 for receiving the circuit board 24. The configuration of the recessed area conforms substantially to the configuration of the circuit board, except that along one portion thereof a portion of the recess 32 extends beyond the board 24 to form an open area 34. The circuit board 24 is securely bonded to the backplate 22 by an epoxy resin 66. A plurality of holes 36 extend through the backplate and communicate between the working gap and the recess area 32. A system of grooves 38 in the reverse side of the backplate 20 connects the holes 36 and extends into the open area 34. The epoxy resin 66 is positioned not to block the constriction formed by the grooves 38 which connect the holes 36 with the open area 34. A thin coating 40 of electrically conductivematerial, such as gold, renders the backplate electrically conductive;
The diaphragm 22 comprises an electret 42 having thereon a coating 44 of electrically conductive material, such as gold. The electret is described in US. Pat. No. 3,6l2,778 titled ElectretAcoustic Transducer and Method-of Making. Thediaphragm is mounted on the backplate by firmly securing the electret along the ridge 26 with the coating 44 facing away from the backplate 20.
The circuit board 24 is mounted in the recess 32with the side bearing electrical components means 46 facing away from the backplate. A relatively smooth side 48 seats within the recess 34. A plurality of leads 50 extend from the circuit board for connection to a terminal board 52 mounted on the housing 12.
The assembly 18 is mounted within the housing 12 to form a first or front air chamber 54 adjacent the front housing member 14 and a second or rear air chamber 56 adjacent the rear housing member 16. The spacing is accomplished by a ring 58 and a resilient gasket 60. The ring 58 is plastic with an electrically conductive coating 62. It establishes electrical connection between the diaphragm and the front member 14. The resilient gasket 60 spaces the assembly 18 from the rear member 16 and loads the assembly so that it is pressed towards the front member 14.
During operation of the microphone, the rear air chamber 56 acts as a resonance chamber. It is in fluid communication with the working gap 30 through the holes 36 and the grooves 38. The grooves 38 and the surface 48 of the circuit board 24 form a air passageway which constitutes a constriction in the fluid communication path between the working gap 30 and the rear air chamber 56 to damp the diaphragm 22. The character of the passageway formed by the grooves 38 and the surface 48 determines the amount of damping which occurs. It will be appreciated that the size of the grooves as well as its length are the fundamental parameters which may conveniently be designed to provide a desired damping action.
Optionally, the microphone 10 may have a second sound inlet port 74 to provide a directional characteristic. Port 74 alone will establish essentially bidirectional operation. If the port is covered by acoustical resistance material 80, spaced from rear member 16 by spacer 76 having opening 78 therein, a unidirectional characteristic preferential to the front is established.
This invention has been described with reference to a preferred embodiment. It will be understood by those skilled in the art that changes may be made without departing from the scope of the invention.
I claim:
1. A miniature condenser microphone including a housing enclosing an electret diaphragm and a minia ture electrical circuit to electrically connect the dia phragm with means external of said housing, said microphone comprising:
a perforate electrically conductive backplate having obverse and reverse sides,
' said obverse side having said d iaph ragm, mounted thereover and spaced therefromt'o farm-2i 'orking gap between said diaphragm and the byerse side of said backplate, said backplate inclildin'g at least one air passageway mean's. there'through to permit fluid communication between the obverse and reverse sides of said backplate; an imperforate electrical circuit board supporting said miniature electrical circuit, said board being mounted on the reverse side of said backplate confronting all said air passageway means along the reverse side of said backplate and partially exposing the reverse side of said backplate, said backplate mating with said board to form a constrictive passageway along the confronting surfaces thereof, said constrictive passageway having an open end at an edge of said board confronting said backplate; said backplate, diaphragm and circuit board forming an assembly; means mounting said assembly in said housing for dividing the interior thereofinto a first air space adjacent said diaphragm along the surface thereof facing away from said working gap and a second air space adjacent said circuit board, said second air space communicating with said working gap through said open end, said constrictive channel and said air passageway means; and 7 means forming in said housing a sound inlet port to said first air space. 2. A miniature condenser microphone according to claim 1 wherein said air passageway means comprises means forming at least one hole in said backplate and wherein said constrictive passageway is formed by a groove extending from said hole between the reverse side of said backplate and said circuit board.
3. A miniature condenser microphone according to claim 1 wherein said air passageway means comprises means forming a plurality of holes in said backplate and wherein said constrictive passageway is formed by the combination of said circuit board and groove means along the reverse side of said backplate joining said holes, said circuit board fronting a part of said groove means.
4. A miniature condenser microphone according to claim 3 further comprising a recess in the reverse side of said backplate for receiving said circuit board.
Claims (4)
1. A miniature condenser microphone including a housing enclosing an electret diaphragm and a miniature electrical circuit to electrically connect the diaphragm with means external of said housing, said microphone comprising: a perforate electrically conductive backplate having obverse and reverse sides, said obverse side having said diaphragm mounted thereover and spaced therefrom to form a working gap between said diaphragm and the obverse side of said backplate, said backplate including at least one air passageway means therethrough to permit fluid communication between the obverse and reverse sides of said backplate; an imperforate electrical circuit board supporting said miniature electrical circuit, said board being mounted on the reverse side of saiD backplate confronting all said air passageway means along the reverse side of said backplate and partially exposing the reverse side of said backplate, said backplate mating with said board to form a constrictive passageway along the confronting surfaces thereof, said constrictive passageway having an open end at an edge of said board confronting said backplate; said backplate, diaphragm and circuit board forming an assembly; means mounting said assembly in said housing for dividing the interior thereof into a first air space adjacent said diaphragm along the surface thereof facing away from said working gap and a second air space adjacent said circuit board, said second air space communicating with said working gap through said open end, said constrictive channel and said air passageway means; and means forming in said housing a sound inlet port to said first air space.
2. A miniature condenser microphone according to claim 1 wherein said air passageway means comprises means forming at least one hole in said backplate and wherein said constrictive passageway is formed by a groove extending from said hole between the reverse side of said backplate and said circuit board.
3. A miniature condenser microphone according to claim 1 wherein said air passageway means comprises means forming a plurality of holes in said backplate and wherein said constrictive passageway is formed by the combination of said circuit board and groove means along the reverse side of said backplate joining said holes, said circuit board fronting a part of said groove means.
4. A miniature condenser microphone according to claim 3 further comprising a recess in the reverse side of said backplate for receiving said circuit board.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US364984A US3895194A (en) | 1973-05-29 | 1973-05-29 | Directional condenser electret microphone |
ES426710A ES426710A1 (en) | 1973-05-29 | 1974-05-28 | Directional condenser electret microphone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US364984A US3895194A (en) | 1973-05-29 | 1973-05-29 | Directional condenser electret microphone |
Publications (1)
Publication Number | Publication Date |
---|---|
US3895194A true US3895194A (en) | 1975-07-15 |
Family
ID=23436997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US364984A Expired - Lifetime US3895194A (en) | 1973-05-29 | 1973-05-29 | Directional condenser electret microphone |
Country Status (2)
Country | Link |
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US (1) | US3895194A (en) |
ES (1) | ES426710A1 (en) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4041251A (en) * | 1973-05-01 | 1977-08-09 | U.S. Philips Corporation | Hearing aid to be worn behind the ear of the user and provided with a pressure-gradient microphone |
US4070741A (en) * | 1976-09-27 | 1978-01-31 | Genrad Inc. | Method of making an electret acoustic transducer |
FR2494951A1 (en) * | 1980-11-24 | 1982-05-28 | Gentex Corp | ELECTRET MICROPHONE PERFECTED |
US4418246A (en) * | 1980-10-29 | 1983-11-29 | Tibbetts Industries, Inc. | Cell assembly for electret transducer |
US4571464A (en) * | 1983-08-19 | 1986-02-18 | Telefonaktiebolaget L M Ericsson | Electret microphone |
EP1183906A1 (en) * | 1999-04-12 | 2002-03-06 | Knowles Electronics, LLC | Package for micromachined silicon condenser microphone |
EP1649718A1 (en) * | 2003-07-29 | 2006-04-26 | BSE Co., Ltd. | Surface mountable electret condenser microphone |
EP1653770A3 (en) * | 2004-10-29 | 2009-11-11 | Sonion Nederland B.V. | Microphone with internal damping |
US20150163572A1 (en) * | 2013-12-05 | 2015-06-11 | Apple Inc. | Pressure Vent for Speaker or Microphone Modules |
CN106231518A (en) * | 2016-08-31 | 2016-12-14 | 常勇 | Modified model electret-type capacitor microphone |
US11297423B2 (en) | 2018-06-15 | 2022-04-05 | Shure Acquisition Holdings, Inc. | Endfire linear array microphone |
US11297426B2 (en) | 2019-08-23 | 2022-04-05 | Shure Acquisition Holdings, Inc. | One-dimensional array microphone with improved directivity |
US11302347B2 (en) | 2019-05-31 | 2022-04-12 | Shure Acquisition Holdings, Inc. | Low latency automixer integrated with voice and noise activity detection |
US11303981B2 (en) | 2019-03-21 | 2022-04-12 | Shure Acquisition Holdings, Inc. | Housings and associated design features for ceiling array microphones |
US11310596B2 (en) | 2018-09-20 | 2022-04-19 | Shure Acquisition Holdings, Inc. | Adjustable lobe shape for array microphones |
US11310592B2 (en) | 2015-04-30 | 2022-04-19 | Shure Acquisition Holdings, Inc. | Array microphone system and method of assembling the same |
US11438691B2 (en) | 2019-03-21 | 2022-09-06 | Shure Acquisition Holdings, Inc. | Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition functionality |
US11445294B2 (en) | 2019-05-23 | 2022-09-13 | Shure Acquisition Holdings, Inc. | Steerable speaker array, system, and method for the same |
US11477327B2 (en) | 2017-01-13 | 2022-10-18 | Shure Acquisition Holdings, Inc. | Post-mixing acoustic echo cancellation systems and methods |
US11523212B2 (en) | 2018-06-01 | 2022-12-06 | Shure Acquisition Holdings, Inc. | Pattern-forming microphone array |
US11552611B2 (en) | 2020-02-07 | 2023-01-10 | Shure Acquisition Holdings, Inc. | System and method for automatic adjustment of reference gain |
US11558693B2 (en) | 2019-03-21 | 2023-01-17 | Shure Acquisition Holdings, Inc. | Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition and voice activity detection functionality |
US11678109B2 (en) | 2015-04-30 | 2023-06-13 | Shure Acquisition Holdings, Inc. | Offset cartridge microphones |
US11706562B2 (en) | 2020-05-29 | 2023-07-18 | Shure Acquisition Holdings, Inc. | Transducer steering and configuration systems and methods using a local positioning system |
US11785380B2 (en) | 2021-01-28 | 2023-10-10 | Shure Acquisition Holdings, Inc. | Hybrid audio beamforming system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3300585A (en) * | 1963-09-04 | 1967-01-24 | Northern Electric Co | Self-polarized electrostatic microphone-semiconductor amplifier combination |
US3777079A (en) * | 1971-10-21 | 1973-12-04 | Willco Gmbh | Directional microphone for head mounted midget hearing aids |
-
1973
- 1973-05-29 US US364984A patent/US3895194A/en not_active Expired - Lifetime
-
1974
- 1974-05-28 ES ES426710A patent/ES426710A1/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3300585A (en) * | 1963-09-04 | 1967-01-24 | Northern Electric Co | Self-polarized electrostatic microphone-semiconductor amplifier combination |
US3777079A (en) * | 1971-10-21 | 1973-12-04 | Willco Gmbh | Directional microphone for head mounted midget hearing aids |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4041251A (en) * | 1973-05-01 | 1977-08-09 | U.S. Philips Corporation | Hearing aid to be worn behind the ear of the user and provided with a pressure-gradient microphone |
US4070741A (en) * | 1976-09-27 | 1978-01-31 | Genrad Inc. | Method of making an electret acoustic transducer |
US4418246A (en) * | 1980-10-29 | 1983-11-29 | Tibbetts Industries, Inc. | Cell assembly for electret transducer |
FR2494951A1 (en) * | 1980-11-24 | 1982-05-28 | Gentex Corp | ELECTRET MICROPHONE PERFECTED |
US4571464A (en) * | 1983-08-19 | 1986-02-18 | Telefonaktiebolaget L M Ericsson | Electret microphone |
EP1183906A1 (en) * | 1999-04-12 | 2002-03-06 | Knowles Electronics, LLC | Package for micromachined silicon condenser microphone |
EP1183906A4 (en) * | 1999-04-12 | 2008-01-23 | Knowles Electronics Llc | Package for micromachined silicon condenser microphone |
EP1649718A1 (en) * | 2003-07-29 | 2006-04-26 | BSE Co., Ltd. | Surface mountable electret condenser microphone |
EP1649718A4 (en) * | 2003-07-29 | 2009-04-08 | Bse Co Ltd | Surface mountable electret condenser microphone |
CN1805611B (en) * | 2004-10-29 | 2013-01-02 | 索尼昂荷兰有限公司 | Microphone with internal damping |
EP1653770A3 (en) * | 2004-10-29 | 2009-11-11 | Sonion Nederland B.V. | Microphone with internal damping |
US20150163572A1 (en) * | 2013-12-05 | 2015-06-11 | Apple Inc. | Pressure Vent for Speaker or Microphone Modules |
US9363587B2 (en) * | 2013-12-05 | 2016-06-07 | Apple Inc. | Pressure vent for speaker or microphone modules |
US11832053B2 (en) | 2015-04-30 | 2023-11-28 | Shure Acquisition Holdings, Inc. | Array microphone system and method of assembling the same |
US11310592B2 (en) | 2015-04-30 | 2022-04-19 | Shure Acquisition Holdings, Inc. | Array microphone system and method of assembling the same |
US11678109B2 (en) | 2015-04-30 | 2023-06-13 | Shure Acquisition Holdings, Inc. | Offset cartridge microphones |
CN106231518A (en) * | 2016-08-31 | 2016-12-14 | 常勇 | Modified model electret-type capacitor microphone |
US11477327B2 (en) | 2017-01-13 | 2022-10-18 | Shure Acquisition Holdings, Inc. | Post-mixing acoustic echo cancellation systems and methods |
US11800281B2 (en) | 2018-06-01 | 2023-10-24 | Shure Acquisition Holdings, Inc. | Pattern-forming microphone array |
US11523212B2 (en) | 2018-06-01 | 2022-12-06 | Shure Acquisition Holdings, Inc. | Pattern-forming microphone array |
US11297423B2 (en) | 2018-06-15 | 2022-04-05 | Shure Acquisition Holdings, Inc. | Endfire linear array microphone |
US11770650B2 (en) | 2018-06-15 | 2023-09-26 | Shure Acquisition Holdings, Inc. | Endfire linear array microphone |
US11310596B2 (en) | 2018-09-20 | 2022-04-19 | Shure Acquisition Holdings, Inc. | Adjustable lobe shape for array microphones |
US11778368B2 (en) | 2019-03-21 | 2023-10-03 | Shure Acquisition Holdings, Inc. | Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition functionality |
US11558693B2 (en) | 2019-03-21 | 2023-01-17 | Shure Acquisition Holdings, Inc. | Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition and voice activity detection functionality |
US11438691B2 (en) | 2019-03-21 | 2022-09-06 | Shure Acquisition Holdings, Inc. | Auto focus, auto focus within regions, and auto placement of beamformed microphone lobes with inhibition functionality |
US11303981B2 (en) | 2019-03-21 | 2022-04-12 | Shure Acquisition Holdings, Inc. | Housings and associated design features for ceiling array microphones |
US11800280B2 (en) | 2019-05-23 | 2023-10-24 | Shure Acquisition Holdings, Inc. | Steerable speaker array, system and method for the same |
US11445294B2 (en) | 2019-05-23 | 2022-09-13 | Shure Acquisition Holdings, Inc. | Steerable speaker array, system, and method for the same |
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US11302347B2 (en) | 2019-05-31 | 2022-04-12 | Shure Acquisition Holdings, Inc. | Low latency automixer integrated with voice and noise activity detection |
US11750972B2 (en) | 2019-08-23 | 2023-09-05 | Shure Acquisition Holdings, Inc. | One-dimensional array microphone with improved directivity |
US11297426B2 (en) | 2019-08-23 | 2022-04-05 | Shure Acquisition Holdings, Inc. | One-dimensional array microphone with improved directivity |
US11552611B2 (en) | 2020-02-07 | 2023-01-10 | Shure Acquisition Holdings, Inc. | System and method for automatic adjustment of reference gain |
US11706562B2 (en) | 2020-05-29 | 2023-07-18 | Shure Acquisition Holdings, Inc. | Transducer steering and configuration systems and methods using a local positioning system |
US11785380B2 (en) | 2021-01-28 | 2023-10-10 | Shure Acquisition Holdings, Inc. | Hybrid audio beamforming system |
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Publication number | Publication date |
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