Patent US2775736A successfully refreshed from Google Patents.
US3602331A
Expired / Lapsed
US
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Sound shielding by means of sound
Assignee: Airbus Defence and Space GmbH
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Filing: 1970-04-10
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Granted: 1971-08-31
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Expires: 1990-04-10
Abstract
Abstract An air permeable sound grating for sound shielding. The grating consists of, or includes, volume changing elements which are controlled by properly positioned means, such as a microphone orientated toward the noise source, to effect change in volume of an adjacent noise transmitting medium, such as air, to effect such a anticyclic change in volume as to cause interference attenuation of the sound at the side of the grating facing away from the noise source. Such volume changing elements are spaced apart a distance less than the wavelength of the highest frequency sound to be shielded and may comprise a variety of means such as spaced heating wires, conductive coating upon a thermal and electrically insulating base, a closed capsule with membrane surfaces having vibration generating means operatively associated with said membrane, radiation generating means for discharging medium heating radiation of energy into the sound transmitting medium together with controls and reflectors for directing the volume changing means or energy to the desired zone to be shielded.
Inventors
- 👤 Oskar Bschorr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:52
CPC Classifications
E; E01; E01F; E01F8/00; E01F8/0094; G; G10; G10K; G10K11/00; G10K11/16; G10K11/175; G10K11/178; G10K11/1785; G10K11/17857; G10K11/17861; G10K11/1787; G10K11/17873; G10K2210/00; G10K2210/10; G10K2210/103; G10K2210/12; G10K2210/30; G10K2210/321; G10K2210/3212; G10K2210/3216; G10K2210/3229; G10K2210/32291
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
65 words
Sound shielding with permeable areas characterized in that a net-, grating-or fencelike noise grating is used, consisting of volume-changing elements, the volume change of which is controlled by a directional microphone oriented toward the noise source, the control being such that the resultant sound field along with the noise field causes interference attenuation at the side of the grating facing away from the noise source.
Claim 2
Dependent Claim
65 words
Sound shielding with permeable areas characterized in that a net-, grating-or fencelike noise grating is used, consisting of volume-changing elements, the volume change of which is controlled by a directional microphone oriented toward the noise source, the control being such that the resultant sound field along with the noise field causes interference attenuation at the side of the grating facing away from the noise source.
Claim 3
Dependent Claim
29 words
Sound shielding with permeable areas in accordance with claim 1, having the spacing between the volume-changing elements smaller than the wavelength of the highest frequency sound to be shielded.
Claim 4
Dependent Claim
41 words
Sound shielding with permeable areas in accordance with claim 1 having, to achieve sound shielding at both sides, a directional microphone at each side of the noise grating, the signals of which are superimposed, the overall signal controlling the volume-changing elements.
Claim 5
Dependent Claim
28 words
Sound shielding with permeable areas in accordance with claim 1 having a switching capability so that shielding may be had at either side or at both sides simultaneously.
Claim 6
Dependent Claim
48 words
Sound shielding with permeable areas in accordance with claim 1 having, for the purpose of creating an absorbent wall, two noise gratings, each working only from one side, so arranged with respect to each other that their sound-impermeable sides are facing each other at a certain distance apart.
Claim 7
Dependent Claim
31 words
Sound shielding with permeable areas in accordance with claim 1 having in the case of large area sound shielding, several directional microphones, each controlling only a section of the sound grating.
Claim 8
Dependent Claim
37 words
Sound shielding with permeable areas in accordance with claim 1 having the control sections controlled by the individual microphones overlapping and having the volume-changing element controlled by several microphones in accordance with the distance to the microphone.
Claim 9
Dependent Claim
27 words
Sound shielding with permeable areas in accordance with claim 1 having several noise gratings assembled together so as to form a closed or partially open sound cage.
Claim 10
Dependent Claim
29 words
Sound shielding with permeable areas in accordance with claim 1, the noise grating serving simultaneously as a mechanical barrier, as a self-supporting fence or as a decorative grating wall.
Claim 11
Dependent Claim
29 words
Noise grating in accordance with claim 1 where the volume-changing elements are electrically conducting wires energized by a frame, the heating power being controlled by control of The current.
Claim 12
Dependent Claim
27 words
Noise grating in accordance with claim 1 having as volume-changing elements coiled heating wires contained in an open bell, the bells being located on a support grating.
Claim 13
Dependent Claim
45 words
Noise grating in accordance with claim 1 having as a volume-changing element a thin metal coating upon a thermal and electrical insulating surface piece, the heating power of this element being controlled by current control and the surface piece being located on a support grating.
Claim 14
Dependent Claim
28 words
Noise grating in accordance with claim 1 having as volume-changing elements closed capsules with membrane surfaces, the latter being controlled by a coil/magnet system located inside the capsule.
Claim 15
Dependent Claim
35 words
Noise grating in accordance with claim 1 having as a volume-changing element an elastic hose mesh, balls or pillows, which are filled with hydraulic fluid, the volume of such elements being controlled by hydraulic pressure.
Claim 16
Dependent Claim
39 words
Noise grating in accordance with claim 1 having as a volume-changing element a radiation absorbed by air, the velocity of the radiation being much greater than the velocity of sound and the intensity being controlled like an antinoise generator.
Claim 17
Dependent Claim
25 words
Noise grating in accordance with claim 15 having the radiation of energy in the form of a disc or the surface of a flat cone.
Claim 18
Dependent Claim
35 words
Noise grating in accordance with claim 16 having the orientation of the disc or conical surface of energy radiation controlled so that the sound wave to be attenuated strikes the disc surface at right angles.
Claim 19
Dependent Claim
38 words
Noise grating in accordance with claim 17 where the conically shaped low pressure wave of the sonic boom is heated by a radiation of energy from a supersonic aircraft, the radiation being capable of being absorbed by air.
Claim 20
Dependent Claim
23 words
Noise grating in accordance with claim 1, the volume-changing element being a line-shaped source of energy, the energy being radiated in a plane.
Claim 21
Dependent Claim
31 words
Noise grating in accordance with claim 1 having, in the case of sound shielding on a limited area, reflectors at the outer borders which cause multiple reflection of the energy radiation.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |