GB2412812A - Microphone in a rear view mirror - Google Patents
Microphone in a rear view mirror Download PDFInfo
- Publication number
- GB2412812A GB2412812A GB0505303A GB0505303A GB2412812A GB 2412812 A GB2412812 A GB 2412812A GB 0505303 A GB0505303 A GB 0505303A GB 0505303 A GB0505303 A GB 0505303A GB 2412812 A GB2412812 A GB 2412812A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microphone
- mirror
- housing
- microphones
- vehicle
- 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
- 230000035945 sensitivity Effects 0.000 description 8
- 239000002775 capsule Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/12—Mirror assemblies combined with other articles, e.g. clocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
- B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
- B60R11/0247—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for microphones or earphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multimedia (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
Abstract
A motor vehicle is provided with a rear vision mirror 2 arranged in the passenger compartment of the vehicle and with at least one microphone 4 mounted in a housing 1 of the mirror. The microphone is an interference tube microphone, which has a directional characteristic oriented in the longitudinal direction of a tube 5, and able to be oriented towards, the vehicle driver or passenger so as to provide improved pick-up of speech and reduced interference by extraneous noise. A single array of microphones may be directed towards the driver and the passenger (figs 3, 4) or one array may be directed towards the driver and one towards the passenger (figs 5-7). The microphone or microphone array(s) may be provided in a drawer (6, figs 2 and 7) at the base of the minor housing. Alternatively the microphone may be mounted on the outside of the mirror housing (fig 9).
Description
MOTOR VEHICLE WITH MICROPHONE
The present invention relates to a motor vehicle with a microphone, particularly a vehicle in which at least one microphone is located at a housing of a rear vision mirror arranged in a passenger compartment of the vehicle.
Such a motor vehicle with an arrangement of the kind is disclosed in DE 201 08 534 U1.
A microphone is usable as part of a free speech installation for mobile radio communication, as part of a system for occupant or interior space communication in a motor vehicle or as part of a speech recognition system which identifies commands spoken by a vehicle occupant and converts them into electronic control signals in order to trigger actions, which correspond with the command, by specific functional groups of the motor vehicle.
It is of great significance not only for use in a free speech installation, but also for speech recognition, for the microphone to record the speech with a smallest possible proportion of accompanying noise. However, due to the inevitable travel noise in a moving vehicle the background noise level is high, which with respect to sensitivity prejudices the signal quality and thus the comprehensibility of the speech for a listener at the other end of a telephone connection or the recognition capability of an automatic speech recognition system. Without suitable measures for noise suppression it is difficult to obtain a speech signal of usable quality with a microphone arranged as proposed in DE 201 08 534 U1.
It would accordingly be desirable to find a solution for this problem.
According to the present invention there is provided motor vehicle provided with a rear vision mirror arranged in a passenger compartment of the vehicle and at least one microphone mounted at or in a housing of the rear vision mirror, the microphone being an interference tube microphone.
Such an interference tube microphone, in which a microphone capsule - in which an acoustic-electric conversion takes place - can be arranged at an end face of the tube having at least one lateral opening, has a directional characteristic which is concentrated in the longitudinal direction of the tube and enables alignment of the microphone with the speaker and suppression of interfering noises from the lateral direction.
A particular advantage of the interference tube microphone is that it can be arranged at a position at or in the mirror housing which in the case of a correctly adjusted rear vision mirror is covered by the mirror from the viewing angle of a driver (who in most cases is also the speaker, to whom the microphone is oriented). The tip of the interference tube opposite the microphone capsule can be closed so that the microphone can, without acoustic disadvantages, be concealed completely behind the mirror and thus does not in any way impair the view of the driver.
In a first, simple embodiment the longitudinal axis of the interference tube is perpendicular to the rear vision mirror. Thus, when the driver has correctly aligned the rear vision mirror, due to the difference between optical axis and acoustic axis the orientation of the microphone to the driver is not precise, but is usable in practice in every case, independently of the body size of the driver and even independently of whether the vehicle is lefthand drive or righthand drive.
In a second embodiment the longitudinal axis of the interference tube is oriented substantially parallel to the viewing direction of the driver onto the rear vision mirror assuming that the rear vision mirror is correctly aligned for the driver. Thus, an optimum reception quality is achieved for the speech of the driver.
In order to also be able to pick up the speech of the front-seat passenger with usable quality a second interference tube microphone is preferably mounted at or in the housing of the rear vision mirror. The two microphones are preferably oriented at opposite, but equal angles with respect to a normal to the surface of the rear vision mirror. A precise orientation of the second microphone to the front-seat passenger does not, in fact, result, but the orientation is better than in the case of a single microphone. The symmetrical arrangement of the two microphones with respect to the surface normal of the rear vision mirror allows use of an identical mirror housing for vehicles with leffhand and righthand drive.
In order to further improve reception quality, the first and/or second interference tube microphone can be a respective part of an arrangement of several parallelly oriented interference tube microphones. Particularly in the case of the second interference tube microphone, the axis of which is generally not precisely oriented to the head of the front- seat passenger, through superimposition of the signals, which are picked up by the several parallel microphones, with a suitable phase offset it is possible to realise an overall sensitivity characteristic of the arrangement of parallel microphones which is better oriented to the frontseat passenger than the sensitivity characteristic of each individual microphone of this arrangement.
The openings usually present at the interference tube of an interference tube microphone preferably open at an underside of the housing of the mirror.
The housing is advantageously constructed from at least two parts, wherein a second one of the parts receives each interference tube microphone and is connected with the bodywork of the motor vehicle only indirectly by way of a first one of the parts. The first part can therefore be made in standardised form in large piece numbers for rear vision mirrors with and without microphones, whilst only the second part has to be specifically designed for the microphone. In addition, division of the housing into two facilitates retrofitting of a microphone or microphones.
The second part of the housing is preferably constructed as a drawer which is received, preferably releasably, in a drawer receptacle of the first part.
Embodiments of the present invention will now be more particularly described by way of example with reference to the accompanying figures, in which: Fig. 1 is a schematic perspective view of a first rear vision mirror mount for a motor vehicle embodying the invention; Fig. 2 is a schematic sectional view of the mirror mount of Fig. 1 in a plane parallel to the mirror; Fig. 3 is a sectional view of a second mirror mount embodying the invention, in a horizontal plane; Fig. 4 is a diagram showing the arrangement of the mirror mount of Fig. 3 in relation to the occupants of a motor vehicle; Fig. 5 is a diagram showing of the arrangement of a third mirror mount embodying the invention, in relation to the occupants of a vehicle; Fig. 6 is a diagram showing a fourth mirror mount embodying the invention; Fig. 7 is a sectional view of the housing the mirror of the fourth embodiment, in a plane parallel to the mirror; Fig. 8 is a sectional view of a fifth mirror mount embodying the invention, in a horizontal plane; and Fig. 9 is a perspective view of a sixth mirror mount embodying the invention.
Referring now to the drawings there is shown in Fig. 1 in perspective view a mirror mount constructed in a manner known per se from a plastics material housing 1 of approximately block-shaped form, wherein one side of the block is formed by a mirror 2 let into the housing. A support arm 3 engages at the upper side of the housing 1 by way of a joint and the other end, which is not illustrated, of the arm is fastened in the passenger compartment of a motor vehicle, for example glued to the inner side of the windscreen thereof or screw-connected, or fastened in another suitable manner, to the roof lining in the vicinity of the front edge thereof.
The mirror housing 1 shown in Fig. 1 is distinguished by a considerable depth which is substantially greater than required solely for secure enclosure of the mirror 2. An interference tube microphone 4 is accommodated in the interior of this housing. When looking at the mirror 2 at right angles or from the usual direction of viewing by a driver of the vehicle wanting to observe the traffic behind, the microphone 4 is completely concealed behind the mirror 2. The mirror 2 is illustrated partly broken away so as to be able to show the microphone 4.
As can be recognised particularly in Fig. 2, the interference tube 5 which is oriented perpendicularly to the surface of the mirror 2 and to the section plane of this figure - of the microphone 4 is constructed integrally with a part 6 of the housing 1. This part 6 has the form of a flat box or a drawer, which, with the help of protruding ribs 7 engageable in grooves 8 of another part 9 of the housing 1, is displaceable relative to this housing part 9 in a direction perpendicular to the mirror surface and withdrawable from the housing part 9.
The underside of the housing part 6 is flush with the surroundir,g underside of the housing part 9. A slot 10 extending in longitudinal direction of the interference tube 5 or a plurality of openings which follow one another in longitudinal direction of the tube 5 connects or connect the interior thereof with the environment and allow sound to enter the tube 5 so that it can ultimately reach a microphone capsule 11, which is mounted at an end wall of the interference tube 5 remote from the mirror 2.
Electrical connections of the microphone capsule 11 are connected with a plug connector 12, which is oriented in displacement direction of the housing part 6 and relative to which a complementary plug connector 13 (cf. Fig. 3) is mounted at the rear side of the mirror 2 so that the two contact one another when the housing part 6 is pushed into the housing part 9 up to the point of abutment. The electrical signal of the microphone is conducted away, for further processing, by way of the plug connector pair 12, 13 and a cable 14 extending in the carrier arm 3.
The end face of the interference tube 5 opposite the microphone capsule 11 is normally closed by the mirror 2. However, if it proves acoustically advantageous a small bore can be provided in the mirror 2 in prolongation of the tube 5 in order to enable direct entry of sound in the longitudinal direction of the tube. Alternatively, the possibility also exists of constructing the tube 5 at its end remote from the microphone capsule to be curved so that it opens at the outer side of the housing part 6.
According to a modification, which is not illustrated, the housing part 6 receiving the microphone is not pushed in from the rear side of the housing part 9, but rather a window into which the housing part 6 can be pushed from below and detented is cut out at the underside of the housing part 9 so that in the mounted state the part 6 fills out the window in flush manner.
As a further alternative a window for pushing-in of the housing part 6 receiving the microphone can be provided at a side wall of the housing part 9, wherein in this case there is preferably provided at each of the two side walls a respective housing part 6 with a respective microphone oriented towards the driver and towards the front-seat passenger.
As the embodiment of Fig. 3 shows, an arrangement of several microphones 4, here with parallel interference tubes 5, can also be provided instead of a single interference microphone. Through superimposition of the electrical signals produced by these ! microphones 4, optionally with a mutually fixed phase displacement relative to one another, it is possible to realise directional characteristics which differ from that of a single interference tube microphone 4 and are, for example, better than a single microphone oriented towards the driver or the front-seat passenger of a motor vehicle in which the mirror carrier is mounted.
A typical arrangement of a mirror carrier in a motor vehicle is shown in Fig. 4. The mirror carrier 15 illustrated here is, in fact, one with three microphones 4 oriented perpendicularly to the mirror 2 as illustrated in Fig. 3, but it could obviously also be a mirror carrier with a single microphone according to Figures 1 and 2.
The mirror carrier 15 is so oriented towards the driver of a (lefthand drive) motor vehicle, the head of whom is denoted in the drawings by 16, that the driver can look, by way of the mirror, in rearward direction exactly opposite to the travel direction. The viewing direction of the driver 16 onto the mirror, illustrated as a dot-dashed line 17, is at an angle of approximately 20 relative to the normal 18 to the surface of the mirror. This surface normal 18 is, since it is parallel to the interference tubes 5, also the direction of maximum sensitivity of the microphones 4. The microphones therefore receive speech of the driver 16 not in the direction of their maximum sensitivity, but at an angle of 20 relative thereto, which, however, is of no significance for recording quality. Speech of the front-seat passenger 19 is received at an angle of 60 relative to the direction of maximum sensitivity; the recording quality of the microphones 4 for that is indeed less than for the speech of the driver 6, but still usable. An improved sensitivity for the speech of the front- seat passenger 19 is possible through superimposition of the signals of the individual microphones by a phase displacement specifically selected for the front-seat passenger 19.
A third embodiment of a mirror carrier 15 is shown in Fig. 5 in a view analogous to Fig. 4.
Two arrangements of microphones 4a, 4b are mounted in a withdrawable part of the housing 1, covered from the viewing angle of the driver 16 by the mirror 2. The microphones 4a have interference tubes oriented parallel to the viewing direction 17 of the driver onto the mirror 2; the microphones 4b are arranged in mirror image to the microphones 4a with respect to the centre plane of the housing 1. The microphones 4a are thus aligned exactly with the head 16 of the driver, whereagainst the microphones 4b are oriented against the travel direction. If it is assumed that, as in the embodiment of Fig. 4, the driver looks at the mirror 2 at an angle of 20 relative to the normal 18 and the mirror 2 is mounted in a centre plane of the vehicle between driver 16 and front- seat passenger 19, then the speech of the front-seat passenger 19 reaches the microphone 4b at an angle of 40 relative to its direction of maximum sensitivity, so that the reception quality is also improved for the speech of the front-seat passenger 19. As a consequence of the symmetrical arrangement of the microphones 4a, 4b, the mirror carrier of Fig. 5 - as also those previously described - is usable in vehicles with lefthand or righthand drive.
Fig. 6 shows a modification of the mirror carrier of Fig. 5, in which the microphones 4b are oriented not against the travel direction, but selectively to the head of the front-seat passenger 19. Since this arrangement is no longer mirror-symmetrical with respect to the centre plane of the housing 1, the good orientation of the microphones to the driver is lost when the mirror carrier of Fig. 6 is used in a vehicle with righthand drive.
However, this problem can be solved by a special design of the housing parts 6 and 9 as shown in Fig. 7. Here the housing part 9 has a closed wall 20 which faces the upper side of the inserted housing part 6, the interengaging ribs 7 and grooves 8 are formed at exactly half the height of the housing part 6, and slots 10 of the interference tube 5 are formed not only at the underside thereof, but also at the upper side thereof facing the closed wall 20 where they do not influence the acoustic behaviour of the microphones. It is thus possible to withdraw the housing part 6 from a guide in the housing part 9 in order to rotate it 180 about the surface normal of the mirror 2 and to reintroduce it in this orientation so that the slots 10 previously closed by the wall 20 now lie at the underside of the housing and the previously exposed slots 10 are now blocked by the wall 20.
Depending on the orientation in which the housing part 6 is introduced, an exact alignment with driver and front-seat passenger of a vehicle with righthand drive or a vehicle with lefthand drive is obtained.
The housing part 9, which is connected with the carrier arm 3, according to the above- described embodiments can also be used, in conjunction with a displaceable housing part 6 not equipped with microphones and not illustrated in the drawings, in vehicles without a free speech installation or without automatic speech recognition. For retrofitting with microphones it is merely necessary to exchange the displaceable housing part for one with microphones as described above. l
A fifth embodiment of a mirror holder is illustrated in Fig. 8 in a horizontal section. Parts corresponding with those of the previously described embodiments are denoted by the same reference numerals and are described again only if and to the extent that they differ from the corresponding parts of the previous embodiments. The housing part 9 is here constructed in two parts, in the form of a hollow rear part 9a and a front part 9b forming a frame for the mirror 2, the parts being detented to one another by clips 21. A blind bore 22 with a cross-section adapted to the interference tube 5 of an interference tube microphone 4 is formed in the rear part. Fig. 8 shows this blind bore 22 oriented perpendicularly to the mirror 2, but as shown in Figs. 5 and 6, different orientations are also possible particularly when several blind bores for several microphones are present. A plug connector 13, which co-operates with a plug connector 12 arranged directly at the microphone in the vicinity of the microphone capsule thereof, is disposed at the base of the blind bore. The interference tube 5 in this embodiment takes over the functions of the housing part 6 of Figs. 2 and 3. The slot 10 illustrated in dashed lines at the underside of the blind bore 22 allows sound to penetrate into the tube 5.
In the case of the sixth embodiment, which is shown in Fig. 9, of the mirror holder an interference tube microphone 4 is mounted at a side wall of the housing 1 of the mirror holder with the help of a resilient clip 23. The end of the interference tube 5 facing the vehicle occupants can be open as shown here, or closed. A mounting of the microphone (or further microphones) at the upper side or underside of the housing 1 is similarly possible with the help of the clip 23.
Claims (10)
1. A motor vehicle provided with a rear vision mirror arranged in a passenger compartment of the vehicle and at least one microphone mounted at or in a housing of the rear vision mirror, the microphone being an interference tube microphone.
2. A vehicle according to claim 1, wherein the microphone is arranged at a location which when the rear vision mirror has a predetermined correct setting with respect to of correctly set rear vision mirror (2) from the viewing angle of a driver (16) of the vehicle is covered by the mirror.
3. A vehicle according to claim 1 or claim 2, wherein the axis of an interference tube of the microphone is substantially perpendicular to the rear vision mirror.
4. A vehicle according to claim 1 or claim 2, wherein the axis of an interference tube of the microphone is substantially parallel to a predetermined viewing direction of a driver of the vehicle onto mirror when in a predetermined correct setting with respect to that angle.
5. A vehicle according to claim 4, wherein at least one further interference tube microphone is mounted at or in the housing of the rear vision mirror and that the first- mentioned microphone and further microphone are oriented at equal, but opposite angles with respect to a normal to the mirror surface.
6. A vehicle according to claim 5, comprising a plurality of such further microphones, the microphones of the plurality being arranged in parallel.
7. A vehicle according to any one of the preceding claims, comprising a plurality of such microphones or first-mentioned microphones as the case may be, the microphone of the plurality being arranged in parallel.
8. A vehicle according to any one of the preceding claims, wherein an interference tube of the microphone or at least one of the microphones has lateral openings which open at an underside of the housing. lo
9. A vehicle according to any one of the preceding claims, wherein the housing is composed of at least two parts, one of the parts being connected with the bodywork of the vehicle and the other part receiving the or each microphone and being connected with the bodywork only indirectly by way of said one part.
10. A vehicle according to claim 9, wherein said other part comprises a drawer received in a receptacle of said one part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004016571 | 2004-03-31 | ||
| DE102004023496A DE102004023496B4 (en) | 2004-03-31 | 2004-05-10 | Motor vehicle with microphone |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0505303D0 GB0505303D0 (en) | 2005-04-20 |
| GB2412812A true GB2412812A (en) | 2005-10-05 |
| GB2412812B GB2412812B (en) | 2006-10-18 |
Family
ID=34524282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0505303A Expired - Fee Related GB2412812B (en) | 2004-03-31 | 2005-03-15 | Motor vehicle with microphone |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE102004023496B4 (en) |
| FR (1) | FR2868370B1 (en) |
| GB (1) | GB2412812B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2924523A1 (en) * | 2007-12-03 | 2009-06-05 | Parrot Sa | Capsule for housing unidirectional microphone of e.g. hands free telephony device integrated autoradio in car, has cavity with volumes arranged at sides of other volume to modify microphone directivity and compensate delay, respectively |
| DE102008020841A1 (en) | 2008-04-25 | 2009-10-29 | Daimler Ag | Mirror i.e. rear view mirror, for use in vehicle interior, has microphones arranged parallel to each other on top side of housing in overlapping manner and aligned to mirror surface in boundary region of housing |
| DE202013000580U1 (en) * | 2013-01-22 | 2014-04-23 | Paragon Ag | Microphone arrangement with adjustable directional characteristic for motor vehicles |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2255687A (en) * | 1991-05-07 | 1992-11-11 | Matsushita Electric Ind Co Ltd | Mobile telephone's microphone sited at cigar lighter socket |
| WO2001037519A2 (en) * | 1999-11-19 | 2001-05-25 | Gentex Corporation | Vehicle accessory microphone |
| US6305732B1 (en) * | 1999-05-18 | 2001-10-23 | Mannesmann Vdo Ag | Dashboard with integrated directional microphone |
| US20020110256A1 (en) * | 2001-02-14 | 2002-08-15 | Watson Alan R. | Vehicle accessory microphone |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63184541A (en) * | 1987-01-23 | 1988-07-30 | Nissan Motor Co Ltd | Instructor panel for automobile |
| DE4315000A1 (en) * | 1993-05-06 | 1994-11-10 | Opel Adam Ag | Noise-compensated hands-free system in motor vehicles |
| US6329925B1 (en) * | 1999-11-24 | 2001-12-11 | Donnelly Corporation | Rearview mirror assembly with added feature modular display |
| DE29908853U1 (en) * | 1999-05-20 | 2000-11-02 | Peiker, Andreas, 61381 Friedrichsdorf | Device for detecting sound waves in a vehicle |
| DE29916448U1 (en) * | 1999-09-18 | 2000-02-17 | Magiera, Udo, 51429 Bergisch Gladbach | Motor vehicle rear-view mirror with storage compartment |
-
2004
- 2004-05-10 DE DE102004023496A patent/DE102004023496B4/en not_active Expired - Fee Related
-
2005
- 2005-03-15 GB GB0505303A patent/GB2412812B/en not_active Expired - Fee Related
- 2005-03-31 FR FR0503134A patent/FR2868370B1/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2255687A (en) * | 1991-05-07 | 1992-11-11 | Matsushita Electric Ind Co Ltd | Mobile telephone's microphone sited at cigar lighter socket |
| US6305732B1 (en) * | 1999-05-18 | 2001-10-23 | Mannesmann Vdo Ag | Dashboard with integrated directional microphone |
| WO2001037519A2 (en) * | 1999-11-19 | 2001-05-25 | Gentex Corporation | Vehicle accessory microphone |
| US6614911B1 (en) * | 1999-11-19 | 2003-09-02 | Gentex Corporation | Microphone assembly having a windscreen of high acoustic resistivity and/or hydrophobic material |
| US20020110256A1 (en) * | 2001-02-14 | 2002-08-15 | Watson Alan R. | Vehicle accessory microphone |
| WO2002065735A2 (en) * | 2001-02-14 | 2002-08-22 | Gentex Corporation | Vehicle accessory microphone |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0505303D0 (en) | 2005-04-20 |
| GB2412812B (en) | 2006-10-18 |
| DE102004023496B4 (en) | 2006-02-23 |
| FR2868370B1 (en) | 2007-07-27 |
| DE102004023496A1 (en) | 2005-10-27 |
| FR2868370A1 (en) | 2005-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20120315 |