EP3111665A1 - Coiffe anti-vent d'un capteur acoustique et capteur acoustique correspondant - Google Patents
Coiffe anti-vent d'un capteur acoustique et capteur acoustique correspondantInfo
- Publication number
- EP3111665A1 EP3111665A1 EP15707107.7A EP15707107A EP3111665A1 EP 3111665 A1 EP3111665 A1 EP 3111665A1 EP 15707107 A EP15707107 A EP 15707107A EP 3111665 A1 EP3111665 A1 EP 3111665A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound
- acoustic sensor
- windshield
- waterproof film
- foam
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H04R1/086—Protective screens, e.g. all weather or wind screens
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/07—Mechanical or electrical reduction of wind noise generated by wind passing a microphone
Definitions
- the present invention relates to the field of sound recording systems, particularly those used in the field of detection.
- such systems can be used to detect a sound source in order to characterize and / or locate it.
- An advantageous application is for example the detection of a shot to locate the origin by equipping military vehicles.
- These sound recording systems include acoustic sensors for example embedded on the roof of the vehicle. These acoustic sensors are therefore exposed to winds of both climatic and aerodynamic origin (caused by the movement of the vehicle).
- Foam windshields and synthetic fur are particularly known.
- foam wind caps are relatively effective at filtering wind noise but are likely to become waterlogged during inclement weather.
- the windshields of synthetic fur protect relatively well from the weather, but their filtering power aerodynamic noise is not sufficient to ensure a sound quality sufficient to detect the sounds of a shot.
- synthetic fur coats are likely to harvest sand or dust, which affects the quality of sound recording.
- the invention overcomes at least one of the aforementioned drawbacks by providing a sound pickup system capable of detecting the sounds characteristic of a shot even in a windy environment while being robust to weather and dust.
- the invention proposes a sound pickup system comprising at least one acoustic sensor, and a windshield surrounding the acoustic sensor, the windshield comprising a layer of foam having sound insulation properties covered on its outer surface with a waterproof film and environmental particles.
- the sound recording system further comprises a processing unit including an amplifier, said processing unit being configured to compensate sound insulation properties of said windshield;
- the layer of foam is a layer of cross-linked polyurethane foam with open cells
- the waterproof film is a polyurethane resin film
- the sealed film is deposited by coating on the foam layer
- the sealed film is deposited by gluing, rolling or transfer, at a temperature between 80 ° C and 200 ° C;
- the waterproof film comprises two layers of polyurethane resin deposited successively;
- the wind cap is hemispherical.
- the windshield has the particularity of attenuating the acoustic signals in a spectrally uniform manner. It is then possible to reconstitute the original acoustic signal by a simple amplification.
- the windshield particularly effectively filters the parasitic noise characteristic of the aerodynamic effects generated on the acoustic sensor exposed to a flow of air while propagating the acoustic waves at the characteristic frequencies of a shot.
- the sound pickup system is then able to detect the characteristic sounds of a shot even in a windy environment while being robust to weather and dust.
- the windshield also has the advantage of being liquid- and particle-tight, allowing the sound system to be operational even when exposed to weather or dust.
- FIG. 3 is a sectional view of the different layers constituting a windshield of a sound pickup system of FIGS. 1 and 2.
- FIG. 1 shows a sound pick-up system comprising an acoustic sensor 2, a windshield 1, and a treatment unit 3.
- the acoustic sensor 2 transforms the acoustic signals it receives into electrical signals which are transmitted to the processing unit 3, which performs a signal processing adapted to an intended application (for example characterize or locate a sound source).
- the wind cap 1 is advantageously fixed on a base 4 so as to form with it a sealed compartment inside which is placed the acoustic sensor 2.
- the base 4 may for example be the roof of the vehicle on which the system of sound recording 10 is installed.
- a sound pick-up system 10 comprising several acoustic sensors 2 (three acoustic sensors 2 are represented here, but of course, the sound pick-up system 10 may comprise a different number) positioned on a support 21 and oriented in different directions.
- the support 21 and the acoustic sensors 2 are placed inside the sealed compartment defined by the windshield 1 and the base 4.
- the windshield 1 is preferably of hemispherical general shape.
- the wind cap 1 consists of a layer of foam 1 1 covered on its outer surface with a waterproof film 12 with water and with environmental particles, and in particular sand and sand. dust.
- the foam layer 1 1 has sound insulation properties.
- the foam layer 1 1 effectively filters the parasitic aerodynamic noise in the audible frequency band, due to the flow of air in front of the acoustic sensor while allowing the capture of the background noise.
- the wind cap 1 has the particularity of attenuating the acoustic signals in a spectrally uniform manner. It is then possible to reconstitute the original acoustic signal by a simple amplification. This is why the processing unit 3 comprises in particular an amplifier 31 making it possible to compensate for the loss of useful signal introduced by the windshield 1, to obtain a signal-to-noise ratio sufficient for the intended application.
- the open-cell foam layer 11 allows propagation of the acoustic waves while filtering the aerodynamic noises.
- the waterproof film 12 allows air to pass through and thus allows optimal propagation of acoustic waves while blocking liquids and small particles
- the foam layer 1 1 preferably has a thickness of between 10 and 25 mm.
- the foam layer 1 1 is preferably a cross-linked foam layer with open cells and preferably made of polyurethane foam.
- the net density of the foam is preferably between 25 and 35 kg / m 3 .
- the compressive strength at 40% of the foam is preferably between 2.5 and 4.5 kPa.
- the average diameter of a cell of the foam is preferably between 500 and 800 micron.
- the waterproof film 12 is preferably made of polyurethane resin and preferably has a thickness of between 10 ⁇ and 15 ⁇ .
- the density of the sealed film 12 is preferably between 1, 15 and 1, 35 kg / m3.
- the foam layer 1 1 of the windshield is shaped by thermoforming or by cold stress.
- the thermoforming allows an optimum fit to the shape of the support 21 carrying the acoustic sensors 2. This adjustment avoids any vibrations of the windshield 1 that could cause noise in the areas in depressions.
- the waterproof film 12 is deposited by coating on the foam layer 1 1 before, during or after shaping thereof.
- the sealed film 12 is preferably deposited by hot gluing at a temperature between 80 ° C and 200 ° C.
- the waterproof film 12 is preferably made of two layers 13 and 14 of superimposed polyurethane resin. Indeed, it has been shown that Wind cap exhibited better acoustic characteristics when the waterproof film 12 consisted of two layers 13 and 14 of polyurethane resin deposited successively rather than a single layer of double thickness.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1451603A FR3017944B1 (fr) | 2014-02-27 | 2014-02-27 | Coiffe anti-vent d'un capteur acoustique et capteur acoustique correspondant |
| PCT/EP2015/054003 WO2015128410A1 (fr) | 2014-02-27 | 2015-02-26 | Coiffe anti-vent d'un capteur acoustique et capteur acoustique correspondant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3111665A1 true EP3111665A1 (fr) | 2017-01-04 |
| EP3111665B1 EP3111665B1 (fr) | 2019-08-21 |
Family
ID=51168030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15707107.7A Active EP3111665B1 (fr) | 2014-02-27 | 2015-02-26 | Coiffe anti-vent d'un capteur acoustique et capteur acoustique correspondant |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9998814B2 (fr) |
| EP (1) | EP3111665B1 (fr) |
| FR (1) | FR3017944B1 (fr) |
| WO (1) | WO2015128410A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1527599A (fr) * | 1966-06-17 | 1968-05-31 | Akg Akustische Kino Geraete | Capteur de sons protégé vis-à-vis des secousses et des courants d'air |
| US6702061B2 (en) * | 2001-03-15 | 2004-03-09 | Siemens Vdo Automotive, Inc. | Environmentally protected microphone for an active noise control system |
| JP4455221B2 (ja) * | 2004-08-19 | 2010-04-21 | 株式会社オーディオテクニカ | マイクロホンの風防カバー |
| US20070003081A1 (en) * | 2005-06-30 | 2007-01-04 | Insound Medical, Inc. | Moisture resistant microphone |
| GB2446619A (en) * | 2007-02-16 | 2008-08-20 | Audiogravity Holdings Ltd | Reduction of wind noise in an omnidirectional microphone array |
| US8157048B2 (en) * | 2009-04-22 | 2012-04-17 | Gore Enterprise Holdings, Inc. | Splash proof acoustically resistive color assembly |
-
2014
- 2014-02-27 FR FR1451603A patent/FR3017944B1/fr active Active
-
2015
- 2015-02-26 EP EP15707107.7A patent/EP3111665B1/fr active Active
- 2015-02-26 US US15/121,597 patent/US9998814B2/en active Active
- 2015-02-26 WO PCT/EP2015/054003 patent/WO2015128410A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3017944B1 (fr) | 2018-05-04 |
| FR3017944A1 (fr) | 2015-08-28 |
| WO2015128410A1 (fr) | 2015-09-03 |
| US20160373846A1 (en) | 2016-12-22 |
| EP3111665B1 (fr) | 2019-08-21 |
| US9998814B2 (en) | 2018-06-12 |
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