US3830333A - Metal attenuator grille for microphone - Google Patents
Metal attenuator grille for microphone Download PDFInfo
- Publication number
- US3830333A US3830333A US00270080A US27008072A US3830333A US 3830333 A US3830333 A US 3830333A US 00270080 A US00270080 A US 00270080A US 27008072 A US27008072 A US 27008072A US 3830333 A US3830333 A US 3830333A
- Authority
- US
- United States
- Prior art keywords
- grille
- central opening
- microphone
- attenuator
- diameter
- 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
Links
- 239000002184 metal Substances 0.000 title abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 239000002984 plastic foam Substances 0.000 description 2
- 230000009118 appropriate response Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/48—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using constructional means for obtaining a desired frequency response
-
- 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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
Definitions
- the present invention relates to a damping disc or grille for a microphone which will attenuate the sound reaching the microphone predictably and without variation.
- the principal object of the present invention is to provide a means ofv modifying the response curve to meet a specific specification with assurance that the response curve will not vary as a result of environmental changes.
- a further object of the present invention' is the replacement of prior attenuators which were capable of absorbing moisture, such as the plastic or woven attenuator, with a solid wall, preferably metallic, having a central opening and a plurality of additional smaller openings spaced from the central opening to provide the appropriate response curve.;
- FIG. 1 is a side view of a behind the ear hearing air having a microphone protected by a grille in accordance with the present invention.
- FIG. 2 is a plan view of the novel microphone grille.
- FIG. 3 is a cross-sectional view through the novel microphone grille taken on line 3-3 of FIG. 2.
- FIG. 4 is a front view correspondingto that of FIG. 2 showing the application of grille cloth to the interior surface of the microphone grille so that it covers the main central opening but not the peripheral openings.
- FIG. 1 there is here shown a behdn the ear hearing aid having a microphone 11 therein protected and covered by the grille 12 of the present invention.
- the grille 12 of FIGS. 2, 3 and 4 is provided with a centralv opening 13 having a plurality of smaller openings 14, 15 and 16 radially spaced from the central opening.
- the central opening as seen in FIG. 4 is covered by a grille cloth 18 which is'adhesively secured to respect to hearing aids-it of course has many wider applications and particularly to utilization in connection with microphones which are expected to be subject to environmental changes.
- the relationship of the various openings to each other may be drawn from the following dimensional elements: Where the round grille of FIGS. 2, 3 and 4 has a diameter of the order of 0.898 inches, the central opening 13 will have a diameter of the order of 0.152
- peripheral openings 14, 15 and 16 are then spaced on a circle having the same center as the grille but 0.75 inches in diameter and the three openings 14, 15 and 16 have a diameter of 0.016 inches. It will thus be seen that the peripheral openings are approximately one'tenth the diameter of the main opening and the principal opening is of the order of one fifth the diameter of the grille measured to the circle along which the peripheral openings are applied.
- a microphone attenuator comprising a solid plate of nonporous non-absorbent material, having a central opening and a plurality of additional relatively smaller openings radially spaced from the central opening at a distance from the periphery of the center opening greater than the diameter of the central opening, said additional openings each having a diameter substantially smaller than that of the central opening and a grille cloth cover for the central opening, the additional openings being free of said grille cloth.
Abstract
A metal attenuator grille for a microphone designed to obviate variations in the attenuation curve owing to environmental changes, comprising a solid metal member having a central opening and a plurality of spaced peripheral openings; the central opening, but not the peripheral openings, may be covered by a grille.
Description
United States Patent [191 Knauert METAL ATTENUATOR GRILLE FOR MICROPHONE [75] Inventor: William F. Knauert, Yonkers, NY.
[73] Assigneei Gould Inc., Chicago, Ill.
[22] Filed: July 10, 1972 21 Appl. No.: 270,080
' 5 2 user; 181/3113,181/23,179/180 51 Int.Cl. H04r 1/28,l-104r25/00 [58] Field of Search l8l/3l-B,,3l R, 23; 179/180,184,188,115,107 H, 115.5
[56] References Cited UNITED STATES PATENTS 2,761,912 9/1956 Touger et al 181/31 B 2,840,178 6/1958 Boleslav 181/31 B Primary Examiner-Stephen J. Tomsky Attorney, Agent, or Firm-Ostrolenk, Faber, Gerb & Soffen I [5 7 ABSTRACT 4 Claims, 4 Drawing Figures 3,830,333 [45] Aug. 20, 1974 PATENTEU 3.830.333
SHEEI 20! 2 drawings in which:
, METAL ATTENUATOR GRILLE FOR MICROPHONE The present invention relates to a damping disc or grille for a microphone which will attenuate the sound reaching the microphone predictably and without variation.
Previously in order to modify the response curve of a microphone it has been common to use metallic or plastic grills and textile or plastic attenuators. Thus one common practice was to use a plastic foam attenuator adjacent the microphone with a woven attenuator outwardly thereof succeeded by a plastic grille and protected by a wire grille. One of the problems was that the plastic foam or the woven attenuator absorbs moisture in humid atmospheres or as, a result of any atmospheric changes and the effectiveness of the attenuator is thus considerably modified.
The principal object of the present invention is to provide a means ofv modifying the response curve to meet a specific specification with assurance that the response curve will not vary as a result of environmental changes.
A further object of the present invention'is the replacement of prior attenuators which were capable of absorbing moisture, such as the plastic or woven attenuator, with a solid wall, preferably metallic, having a central opening and a plurality of additional smaller openings spaced from the central opening to provide the appropriate response curve.;
Still a further object of the present invention is the utilization of the arrangement of the smaller openings spaced from the central opening to create a plurality of FIG. 1 is a side view of a behind the ear hearing air having a microphone protected by a grille in accordance with the present invention.
FIG. 2 is a plan view of the novel microphone grille.
FIG. 3 is a cross-sectional view through the novel microphone grille taken on line 3-3 of FIG. 2.
FIG. 4 is a front view correspondingto that of FIG. 2 showing the application of grille cloth to the interior surface of the microphone grille so that it covers the main central opening but not the peripheral openings.
Referring now to F IG. 1, there is here shown a behdn the ear hearing aid having a microphone 11 therein protected and covered by the grille 12 of the present invention. The grille 12 of FIGS. 2, 3 and 4 is provided with a centralv opening 13 having a plurality of smaller openings 14, 15 and 16 radially spaced from the central opening. The central opening as seen in FIG. 4 is covered by a grille cloth 18 which is'adhesively secured to respect to hearing aids-it of course has many wider applications and particularly to utilization in connection with microphones which are expected to be subject to environmental changes. v
In one application where the microphone is much larger than would be used in a behind the ear hearing aid, the relationship of the various openings to each other may be drawn from the following dimensional elements: Where the round grille of FIGS. 2, 3 and 4 has a diameter of the order of 0.898 inches, the central opening 13 will have a diameter of the order of 0.152
inches. The peripheral openings 14, 15 and 16 are then spaced on a circle having the same center as the grille but 0.75 inches in diameter and the three openings 14, 15 and 16 have a diameter of 0.016 inches. It will thus be seen that the peripheral openings are approximately one'tenth the diameter of the main opening and the principal opening is of the order of one fifth the diameter of the grille measured to the circle along which the peripheral openings are applied.
By this means therefore the difficulties which arosein connection with prior attenuators which are capable of absorbing moisture are obviated and a simplified microphone attenuator grille is thereby provided.
In the foregoing the invention has been described in accordance with a single illustrative embodiment. Since it is obvious that many variations and modifications may be made within the scope of the disclosure it is preferred that the invention described not be limited by the specific disclosures herein but only by the appended claims.
The embodiments of the invention in which a specific privilege or property is claimed are defined as follows: 1. A microphone attenuator comprising a solid plate of nonporous non-absorbent material, having a central opening and a plurality of additional relatively smaller openings radially spaced from the central opening at a distance from the periphery of the center opening greater than the diameter of the central opening, said additional openings each having a diameter substantially smaller than that of the central opening and a grille cloth cover for the central opening, the additional openings being free of said grille cloth.
2. The microphone attenuator grille of claim 9 in which the diameter of each of the additional openings is of the order of one tenth that of the central opening.
3. The microphone attenuator grille of claim 2 in which the additional openings are spaced at a radial distance from the. center of the central opening along a circle having a diameter of the order offive times the diameter of the central opening.
4. The microphone attenuator grille of claim 3 in which the additional openings are three in number spaced apart.
Claims (4)
1. A microphone attenuator comprising a solid plate of nonporous non-absorbent material, having a central opening and a plurality of additional relatively smaller openings radially spaced from the central opening at a distance from the periphery of the center opening greater than the diameter of the central opening, said additional openings each having a diameter substantially smaller than that of the central opening and a grille cloth cover for the central opening, the additional openings being free of said grille cloth.
2. The microphone attenuator grille of claim 9 in which the diameter of each of the additional openings is of the order of one tenth that of the central opening.
3. The microphone attenuator grille of claim 2 in which the additional openings are spaced at a radial distance from the center of the central opening along a circle having a diameter of the order of five times the diameter of the central opening.
4. The microphone attenuator grille of claim 3 in which the additional openings are three in number spaced 120* apart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00270080A US3830333A (en) | 1972-07-10 | 1972-07-10 | Metal attenuator grille for microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00270080A US3830333A (en) | 1972-07-10 | 1972-07-10 | Metal attenuator grille for microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3830333A true US3830333A (en) | 1974-08-20 |
Family
ID=23029824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00270080A Expired - Lifetime US3830333A (en) | 1972-07-10 | 1972-07-10 | Metal attenuator grille for microphone |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3830333A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811402A (en) * | 1986-11-13 | 1989-03-07 | Epic Corporation | Method and apparatus for reducing acoustical distortion |
| US20050276428A1 (en) * | 2004-06-14 | 2005-12-15 | Kabushiki Kaisha Audio-Technica | Dynamic microphone |
| US20190149934A1 (en) * | 2017-11-16 | 2019-05-16 | Robert Bosch Gmbh | Device for airborne sound acoustic sensing of the surroundings of a vehicle, vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761912A (en) * | 1951-05-31 | 1956-09-04 | Martin L Touger | Sound translating apparatus |
| US2840178A (en) * | 1954-01-20 | 1958-06-24 | Tesla Np | Device for the reproduction of sound |
-
1972
- 1972-07-10 US US00270080A patent/US3830333A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761912A (en) * | 1951-05-31 | 1956-09-04 | Martin L Touger | Sound translating apparatus |
| US2840178A (en) * | 1954-01-20 | 1958-06-24 | Tesla Np | Device for the reproduction of sound |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4811402A (en) * | 1986-11-13 | 1989-03-07 | Epic Corporation | Method and apparatus for reducing acoustical distortion |
| US20050276428A1 (en) * | 2004-06-14 | 2005-12-15 | Kabushiki Kaisha Audio-Technica | Dynamic microphone |
| US7561705B2 (en) * | 2004-06-14 | 2009-07-14 | Kabushiki Kaisha Audio-Technica | Reduction of flux leakage in a dynamic microphone |
| US20190149934A1 (en) * | 2017-11-16 | 2019-05-16 | Robert Bosch Gmbh | Device for airborne sound acoustic sensing of the surroundings of a vehicle, vehicle |
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