EP0781070A1 - Akustische Antenne für Computerarbeitsplatz - Google Patents

Akustische Antenne für Computerarbeitsplatz Download PDF

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Publication number
EP0781070A1
EP0781070A1 EP96402825A EP96402825A EP0781070A1 EP 0781070 A1 EP0781070 A1 EP 0781070A1 EP 96402825 A EP96402825 A EP 96402825A EP 96402825 A EP96402825 A EP 96402825A EP 0781070 A1 EP0781070 A1 EP 0781070A1
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EP
European Patent Office
Prior art keywords
antenna
microphones
microphone
support
screen
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
Application number
EP96402825A
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English (en)
French (fr)
Other versions
EP0781070B1 (de
Inventor
Yannick Mahieux
Grégoire Le Tourneur
Alain Saliou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Orange SA
Original Assignee
France Telecom SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by France Telecom SA filed Critical France Telecom SA
Publication of EP0781070A1 publication Critical patent/EP0781070A1/de
Application granted granted Critical
Publication of EP0781070B1 publication Critical patent/EP0781070B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/401—2D or 3D arrays of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/405—Non-uniform arrays of transducers or a plurality of uniform arrays with different transducer spacing

Definitions

  • the invention relates to an acoustic antenna for a computer workstation.
  • the workstation tends to become a communication interface between the user and the machine, or the workstation, or even between each user, when the workstations are networked.
  • a particularly interesting application of these workstations relates to videoconferencing, application during which several workstations and of course their users can communicate by means of messages conveyed by audio and video links.
  • each workstation allows the user thereof to communicate by video and audio messages independently, in particular of the position of the user, speaker, vis-à-vis the workstation considered, or even, more generally, when several workstations are combined in the same meeting room, within the framework of a meeting by multiple videoconference, regardless of the environmental context thus created, as well as the noise generated by the fans of these workstations, external noise from air conditioning or other, as well as the acoustic echo generated by the speakers of these workstations.
  • the aerial thus formed having the shape of a concave strip placed above the upper face of the video display monitor of the workstation, was considered unattractive by users or potential users.
  • the concave strip constituting the above-mentioned aerial cannot be easily integrated into the terminal of the computer workstation, in particular into the casing of the video display monitor thereof, unless significant modifications of the latter are provided, these modifications being moreover likely to modify the generally satisfactory conditions of sound recording.
  • the object of the present invention is to remedy the aforementioned drawbacks of acoustic antennas of the prior art, more particularly intended for computer workstations.
  • An object of the present invention is in particular the implementation of an acoustic antenna for a computer workstation retaining properties of conditions sound recording, capable of being integrated without major difficulty into the video display monitor of the workstation for which it is intended.
  • Another object of the present invention is also the implementation of an acoustic antenna for a computer workstation having, in addition to the aforementioned satisfactory sound-taking condition properties, which, although not easily integrated, has a very discreet appearance and therefore easily aesthetically acceptable to users.
  • the acoustic antenna for computer workstation comprising a display screen, object of the present invention, is remarkable in that it comprises a plurality of microphones connected to a summing circuit, these microphones being distributed in an arrangement to form at least a substantially straight line.
  • the microphones are each spaced apart, relative to a reference microphone placed in the vicinity of the vertical axis of symmetry of the screen according to a determined law, the arrangement thus presenting a substantially cylindrical directivity diagram whose axis of revolution is formed by this straight line.
  • the acoustic antenna, object of the present invention finds application in the implementation of computer workstations, more particularly intended for videoconferencing applications.
  • FIGS. 2a and 2b A more detailed description of the acoustic antenna for computer workstation in accordance with the object of the present invention will now be given in conjunction with FIGS. 2a and 2b.
  • the computer workstation comprises a display monitor or display screen making it possible to carry out the support function of the acoustic antenna object of the present invention.
  • the latter comprises a plurality of microphones, denoted M i , connected to a summing circuit intended, from an incident sound wave OSI, to deliver a corresponding sound signal.
  • the summing circuit is not shown so as not to overload the drawing.
  • the microphones M i are distributed in an arrangement to form at least one line substantially straight, line x'x in Figure 2a.
  • the microphones M i are each spaced relative to a reference microphone, denoted M ir , placed in the vicinity of the vertical axis of symmetry of the screen according to a determined distribution law.
  • the reference microphone M ir allows, for a symmetrical configuration of the distribution of the microphones on the substantially rectilinear line x'x, to produce a configuration symmetrical with respect to the average position of the user speaker.
  • the above-mentioned arrangement of microphones then presents a substantially cylindrical directivity diagram whose axis of revolution is formed by the rectilinear line previously mentioned.
  • the acoustic antenna for computer workstation object of the present invention, corresponds to an embodiment of the "broadside" type.
  • the incident sound wave OSI coming from the speaker, is then perpendicular to the above-mentioned rectilinear line x'x on which the microphones M i are distributed.
  • the arrangement of microphones then presents a directivity diagram in reception which consists of a substantially vertical disk of width D in the plane of azimuth P, that is to say in the plane comprising the angle of azimuth for the reference microphone M ir .
  • the thickness of the disc thus formed in fact corresponds to the width of the main lobe of the directivity diagram on reception of the antenna thus formed.
  • the thickness D of the aforementioned disc is, at a given frequency, inversely proportional to the length of the antenna, that is to say ultimately to the number of microphones M i and their spacing compared to the reference microphone M ir .
  • this embodiment corresponding to an acoustic antenna of the "end-fire" type, the line being substantially rectilinear bears the reference y'y, this line being substantially parallel to the mean direction of propagation of the incident sound wave OSI.
  • the arrangement of microphones has, with respect to the reference microphone M ir , a directivity diagram in reception also substantially cylindrical, the axis of revolution being formed by the above-mentioned rectilinear line.
  • the OSI incident sound wave parallel to the direction of the substantially rectilinear line y'y sees a more directivity diagram in reception insofar as the dimension D relative to the opening of the diagram of directivity in reception substantially corresponds to the diameter of the substantially cylindrical directivity diagram, the opening angle ⁇ of the main lobe being of the order of 80 °.
  • the reference microphone M ir is of course placed in the vicinity of the vertical axis of symmetry of the screen and the successive microphones M i are placed on the right y'y substantially in the vertical plane of symmetry of the aforementioned screen of the corresponding computer workstation.
  • FIG. 2a A more detailed description of the embodiment relating to FIG. 2a corresponding to a "broadside" antenna will now be given in connection with FIG. 3a.
  • the acoustic antenna according to the invention comprises, to make the arrangement of microphones, a plurality of microphones M i distributed on a first substantially horizontal line, placed in the upper part of the screen and at least one microphone placed on a second and a third line x 1 x ' 1 and x 2 x' 2 respectively, the second and the third line being placed perpendicular to the ends of the first line x'x.
  • the microphones of the first, second and third lines are arranged on a plane.
  • the microphones M i are arranged on an antenna support, made for example of plastic material, this antenna support and the corresponding microphones M i being arranged at the top of the filter. of the display screen, as shown in Figure 3a.
  • the antenna support and the microphones can also be placed on the screen itself or on the video monitor comprising this screen. More particularly, it is indicated that the microphone support can be produced by a plastic strip whose height is of the order of a few centimeters, 4 to 5 cm, in the direction orthogonal to the direction of propagation of the OSI incident sound wave.
  • the microphones M i are thus embedded in the support strip and are thus placed 2 or 3 cm in front of the screen itself.
  • the microphones M i and the reference microphone M ir are grouped by interconnection into elementary sub-antennas.
  • FIG 3b there is shown a detail of the antenna of the "broadside" type of Figure 3a, including the subdivision thereof into sub-antennas.
  • the microphones denoted M i0 to M i8 , are by way of nonlimiting example of unidirectional type. They are distributed symmetrically with respect to the central microphone M i0 constituting in fact the reference microphone M ir . The symmetrical distribution is heard on the support in the direction x'x orthogonal to the direction of the incident sound wave OSI.
  • Each microphone is connected to a common summator ⁇ by means of filters, denoted H 1 to H 4 , by means of elementary summers, denoted S 1 to S 4 , each elementary summer S 1 and S 4 in fact defining a sub-antenna.
  • each microphone can advantageously be carried out by means of corresponding switches, denoted I 0 to I 8 , and each elementary summator S 1 to S 4 can be connected to the common summator ⁇ via a filter H 1 to H 4 and a switch in series IS 1 to IS 4 .
  • x kd
  • k a relative integer
  • d an arbitrary distance linked to the cutoff frequency of the filters H 1 to H 4
  • x represents the algebraic value of the abscissa of each microphone with respect to the reference microphone M ir , the microphone M i0 .
  • d 2.13 cm
  • the abscissa of the 9 microphones installed on the support S were as follows: Mi7 Mi5 Mi3 Mi1 Mi0 Mi2 Mi4 Mi6 Mi8 -8d -4d -2d -d 0 d 2d 4d 8d -17.04cm - 8.52 cm - 2.13 cm - 2.13 cm 0 2.13 cm 4.26 cm 8.52 cm 17.04 cm
  • the value of the distance d is chosen as a function of the value of the cutoff frequency of the filters H 1 to H 4 .
  • FIGS. 2a and 3a, 3b appear particularly advantageous insofar as, while it allows entirely satisfactory sound pickup conditions, the integration of the antenna corresponding acoustics do not pose any major difficulty.
  • this embodiment corresponding to a "broadside" type antenna
  • the only solution which can be practically envisaged for increasing the aforementioned rejection rate is to reduce the thickness D of the disc, that is to say the opening dimension of the main lobe of the directivity diagram in reception, by the increase in the number of microphones M i and in the dimensions of the antenna thus produced.
  • the acoustic antenna shown in FIG. 2b is similar to the microphones known by the name of micro guns.
  • the correct set of delays applied to the elementary speech signals delivered by each microphone M i and by the reference microphone M ir are in fact preferred.
  • the directivity diagram on reception is, as shown in FIG. 2b, formed by substantially a cylinder whose base is oriented towards the speaker.
  • the rejection of the environmental noise and the room effect is substantially identical in number of microphones equal to that obtained with the acoustic antenna of the "broadside” type.
  • the opening angle of the main lobe is much greater, of the order of 80 ° instead of 25 ° in the case of the "broadside” type antenna. Consequently, the embodiment of FIG. 2b makes it possible to maintain sufficient speech quality during lateral movements of the speaker relative to the vertical plane of symmetry of the display screen.
  • the acoustic antenna according to the invention is subdivided into sub-antennas.
  • the antenna acoustic, end-fire type is deemed to consist of 9 successive microphones, aligned on a support from the reference microphone M ir designated by M i0 , noted S.
  • the other successive microphones, in the direction of propagation of the OSI incident sound wave, are successively noted M i1 to M i8 .
  • the acoustic antenna according to the invention is subdivided into sub-antennas, each sub-antenna comprising microphones spaced on the rectilinear support by a determined distance.
  • a first sub-antenna is formed by the microphones M i8 to M i6 as well as by the microphones M i4 and by the reference microphone M ir , these microphones being connected to the same elementary adder S 1 , a second elementary antenna formed by the microphones M i6 to M i4 as well as by the microphones M i2 and M ir connected to the same elementary adder S 2 , and a third elementary antenna is finally formed by the microphones M i4 to M i1 and by the reference microphone M ir linked to the same third elementary summator S 3 .
  • the elementary summers S 1 , S 2 , S 3 are connected to a common summator, note ⁇ , delivering the speech signal via, for example, filters, denoted H 1 , H 2 and H 3 .
  • the sound signal delivered by each microphone is then subjected to a corresponding delay by means of a delay circuit, denoted D 0 to D 7 in FIG. 4a, the microphone M i8 not being of course subjected to no delay due to the maximum delay in receiving the audio signal from the speaker received by the latter microphone.
  • the maximum delay is thus provided by the delay circuit D 0 on the sound signal delivered by the reference microphone M ir or M i0 , the value of this delay being successively decreasing for the delays brought by the delay circuits D 1 to D 7 on the sound signals delivered successively by the corresponding microphones M i1 to M i7 .
  • the microphones M ir to M i1 , M i8 are successively spaced on the rectilinear support S by a distance in arithmetic progression of multiple reason of the smallest distance d separating the neighboring microphone from the microphone of reference.
  • k is a positive integer
  • c represents the speed of propagation of the incident sound wave in the ambient medium
  • Fe represents the sampling frequency
  • the microphone M i1 is distant from the microphone M ir , reference microphone, by the distance d
  • the microphones M i2 to M i4 are each at the same distance d.
  • the microphones M i5 and M i6 are distant from the front microphone M i , respectively M i5 by a distance 2d
  • the microphones M i7 and M i8 are distant from the front microphone, respectively M i6 , M i7 by a distance 4d.
  • the delay circuit D 0 makes it possible to apply a delay equal to the sum of the delays introduced by the maximum spacing between the reference microphone M ir and the extreme microphone M i8 , ie a delay corresponding to 16 sampling periods since in fact, the minimum elementary distance d separating two successive microphones corresponds to a time delay in propagation of the incident sound wave equal to a sampling period.
  • the delay circuits D 1 to D 7 make it possible successively to generate a delay equal to 15T, 14T, 13T, 12T, 10T, 8T and 4T where T represents the value of the sampling period of the sound signal delivered by each microphone.
  • d can be arbitrarily, without limitation, chosen to be identical in the case of the "broadside” antenna and in the case of the "end-fire” antenna.
  • delay circuits D 0 to D 7 As regards a practical embodiment of the delay circuits D 0 to D 7 , it is indicated that these delay circuits can be produced, either by analog circuits when the delay is applied directly at the output of each microphone concerned, or, on the contrary, from digital circuits when the delay is applied while the analog-to-digital conversion previously mentioned in the description has already been carried out.
  • the analog or digital embodiment of the delay circuits does not pose any problem since the analog to digital conversion of the speech signals delivered by each microphone can be carried out in a conventional manner from analog digital converters ⁇ , ⁇ .
  • Corresponding embodiments will not be described in detail in the present description because they correspond to techniques known to those skilled in the art.
  • These analog digital converters can be associated with the delay circuits or preferably at the output of the microphones, as mentioned in FIG. 4a by the reference + CAN.
  • the support S is produced from a rigid support, acoustically non-disturbing.
  • the support S can be constituted by a rigid rod forming the rectilinear support and by a plurality of microphone supports, each microphone support being formed by a mechanical part with a double element of substantially symmetrical structure.
  • the microphone supports carry, without limitation, the reference P 0 to P 4 for example.
  • Each microphone support P 0 to P 4 is formed by a mechanical part with a double element of substantially symmetrical structure, a first element of which is intended to ensure the positioning of the corresponding microphone support on the rigid rod S, while a second element is intended to receive and maintain a corresponding microphone.
  • the mechanical part with a double element of substantially symmetrical structure has the shape of an eight, one of the rings of which is threaded on the support S in order to ensure the positioning of the microphone support on the rigid rod S above, and the second ring constituting the second element is intended to receive and maintain a microphone.
  • the mechanical resistance of the microphones on the supports is guaranteed by a forced mounting, for example, or by a locking needle screw, any risk of shifting in position of the microphones being then eliminated.
  • the rod forming the support S is hollow and has a central core.
  • the support rod S is further provided on one of the generating lines of the lateral surface thereof, with a plurality of through holes placing in communication the central core and the external part of the rod, this in order to allow the passage of the connection wires fc from each microphone into the central core.
  • the mechanical parts with double structural element constituting the supports of microphones advantageously have a thickness dimension in the longitudinal direction y'y of the support S as small as possible, so as not to disturb the acoustic characteristics of each microphone.
  • the acoustic antenna, object of the present invention can advantageously include a set of switches, denoted I 0 to I 8 , a switch of this set of switches being placed in serial link on the connection for example to the corresponding delay circuits D 0 to D 7 or to the element summator S 1 .
  • Each switch I 0 to I 8 ensures the connection or non-connection of at least one microphone to the summing circuit ⁇ via the elementary summing circuits. This operating mode then makes it possible to modify the reception diagram of the acoustic antenna according to the invention as a function of the configuration of connection or non-connection of the microphones of the antenna.
  • the switching to a different antenna diagram can also be carried out by switching at the level of the output signals delivered by the sub-antennas, that is to say by the summers S 1 to S 3 .
  • specific switches IS 1 to IS 3 can be provided, as shown in FIG. 4a.
  • a larger lobe for the case where several people are present in front of the work station, can be obtained by replacing the sum at the output of the summator ⁇ by the signal delivered by the summator S 3 , that is to say say by the smaller sub-antenna.
  • the transfer function of the filter associated with the aforementioned sub-antenna is modified accordingly.
  • the elementary delay allowed is equal to the sampling period previously mentioned in the description.
  • this elementary delay proves to be insufficiently precise to point the antenna in the direction of the speaker.
  • one way of achieving such delays consists in placing these microphones so that the delays are multiple of the aforementioned sampling period. It is then no longer necessary, to point in the direction of the speaker, to use costly interpolation techniques in terms of computation time.
  • FIGS. 5a to 5b various directivity diagrams have been shown on reception for a "broadside" type antenna, FIG. 5a, using omnidirectional microphones, 9 microphones as shown in FIG. 2a.
  • the directivity diagram thus represented, the microphones being aligned on the axis of symmetry x'x, present, as mentioned previously, substantially the appearance of a vertical disk, but, more particularly, that of a torus, at least for the main lobe as shown in FIG. 5a.
  • the directivity diagram also includes degenerate side lobes extending in the direction x'x, these side lobes, although present, are not however represented. significantly in Figure 5a, these being masked in the chosen representation.
  • the directivity diagram of an "end-fire" type antenna has also been represented, also comprising 9 microphones placed as shown in FIG. 2b.
  • the microphones are of course placed and aligned in the direction y'y as shown in FIG. 5b, the directions x'x, y'y and z'z of FIG. 5a and of FIG. 5b being identical in order to facilitate the comparison.
  • the reference microphone M ir is placed in the vicinity of the origin of the axes OXYZ, the corresponding directivity diagrams being those carried out in the far field.
  • the directivity diagram has substantially the shape of a cylinder for which the opening of the main lobe is much greater than that of the opening of the main lobe of the directivity diagram of the "broadside antenna""shown in Figure 5a.
  • the speaker is, with respect to the reference microphone M ir , in the direction y'y.
  • FIGs 5c and 5d there is shown, in top view, a top view respectively of Figure 5a in which the side lobes of the directivity diagram are visible, and of Figure 5b in which the rear lobe has been removed by judicious choice of the spacings of the microphones and the delays which are applied to the speech signals generated by the latter.
  • Microphones used in this case are unidirectional.
  • FIG. 5d the directivity diagram of an "end-fire" antenna has been shown for which the microphones are distributed in the direction y'y.
  • a "broadside” type antenna for which the microphones are distributed in the x'x direction and whose directivity diagram is represented in FIG. 5c, it is possible, in accordance with a remarkable aspect of the acoustic antenna object of the invention, to obtain a directivity diagram similar to that of an "end-fire" antenna as shown in FIG. 5d, but subjected to a rotation of ⁇ / 2 by the introduction of delays on the signals delivered by the microphones, the axis of symmetry of the directivity diagram then being the axis x'x.
  • the spatial selectivity of the acoustic antennas used is linked to the ratio of their size to the wavelength considered. In the low frequency domain, the antennas used do little to reduce the effect of the acoustic environment thereof.
  • the increase in selectivity at low frequency requires a significant increase in the size of the antenna if, of course, it is desired to keep the same structure.
  • the end-fire type acoustic antenna in which all the speech signals delivered by each microphone are digitized, it is possible to implement very sophisticated speech signal processing techniques, likely to improve noise rejection and room effect. These processing techniques can consist of Wiener or Ephraim and Malah filtering techniques.
  • the switches mentioned above can then be used so as to switch on demand the antenna of the "end-fire” type or, if necessary, the antenna of the "broadside” type on a privileged microphone, the reference microphone M ir , all the other microphones being for example disconnected.
  • a certain spatial selectivity can however be preserved by switching to a determined smaller sub-antenna.
  • the acoustic antenna, object of the present invention Compared to a single microphone, the acoustic antenna, object of the present invention, whether in its embodiment of "broadside” or “end-fire” type, improves echo control since this type of antenna increases, by its spatial selectivity, the decoupling between the loudspeaker and the sound recording system.
  • the electronic orientation of the main lobe of the antenna can be achieved by the use of devices for interpolating the speech signals delivered by each microphone, such a function of electronic orientation of the main lobe being unable to be optimized. than in the event that a speaker locator system is used.
  • Such a function of electronic orientation of the main lobe finds a privileged application in the context of the use and the application to videoconferencing.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Circuit For Audible Band Transducer (AREA)
EP96402825A 1995-12-22 1996-12-19 Akustische Antenne für Computerarbeitsplatz Expired - Lifetime EP0781070B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9515387 1995-12-22
FR9515387A FR2742960B1 (fr) 1995-12-22 1995-12-22 Antenne acoustique pour station de travail informatique

Publications (2)

Publication Number Publication Date
EP0781070A1 true EP0781070A1 (de) 1997-06-25
EP0781070B1 EP0781070B1 (de) 2003-07-16

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EP (1) EP0781070B1 (de)
DE (1) DE69629095D1 (de)
FR (1) FR2742960B1 (de)

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WO2000030402A1 (en) * 1998-11-12 2000-05-25 Gn Netcom A/S Microphone array with high directivity
US6473514B1 (en) 2000-01-05 2002-10-29 Gn Netcom, Inc. High directivity microphone array
US8923529B2 (en) 2008-08-29 2014-12-30 Biamp Systems Corporation Microphone array system and method for sound acquisition

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AU2002243224A1 (en) * 2000-11-16 2002-06-24 The Trustees Of The Stevens Institute Of Technology Large aperture vibration and acoustic sensor
DE10063242C2 (de) * 2000-12-19 2003-02-20 Siemens Ag Kommunikationsendgerät mit Antenne
US7072690B2 (en) * 2001-04-11 2006-07-04 Lg Electronics Inc. Multi-band antenna and notebook computer with built-in multi-band antenna
US7068796B2 (en) * 2001-07-31 2006-06-27 Moorer James A Ultra-directional microphones
US20030125959A1 (en) * 2001-12-31 2003-07-03 Palmquist Robert D. Translation device with planar microphone array
GB2387499B (en) * 2002-04-10 2004-05-26 Motorola Inc Switched-geometry microphone array arrangement and method
EP1489596B1 (de) * 2003-06-17 2006-09-13 Sony Ericsson Mobile Communications AB Verfahren und Vorrichtung zur Sprachaktivitätsdetektion
US8457614B2 (en) * 2005-04-07 2013-06-04 Clearone Communications, Inc. Wireless multi-unit conference phone
JP4965847B2 (ja) 2005-10-27 2012-07-04 ヤマハ株式会社 音声信号送受信装置
US8238584B2 (en) * 2005-11-02 2012-08-07 Yamaha Corporation Voice signal transmitting/receiving apparatus
JP5028786B2 (ja) * 2005-11-02 2012-09-19 ヤマハ株式会社 収音装置
JP4747949B2 (ja) * 2006-05-25 2011-08-17 ヤマハ株式会社 音声会議装置
JP5166122B2 (ja) * 2008-05-27 2013-03-21 株式会社船井電機新応用技術研究所 音声入力装置
US8886541B2 (en) * 2010-02-04 2014-11-11 Sony Corporation Remote controller with position actuatated voice transmission
EP2988527A1 (de) * 2014-08-21 2016-02-24 Patents Factory Ltd. Sp. z o.o. System und Verfahren zur Ortung von Schallquellen in einem dreidimensionalen Raum

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WO2000030402A1 (en) * 1998-11-12 2000-05-25 Gn Netcom A/S Microphone array with high directivity
AU753058B2 (en) * 1998-11-12 2002-10-03 Gn Netcom A/S Microphone array with high directivity
US6526147B1 (en) 1998-11-12 2003-02-25 Gn Netcom A/S Microphone array with high directivity
US6473514B1 (en) 2000-01-05 2002-10-29 Gn Netcom, Inc. High directivity microphone array
US6763118B2 (en) 2000-01-05 2004-07-13 Gn Netcom, Inc. High directivity microphone array
US8923529B2 (en) 2008-08-29 2014-12-30 Biamp Systems Corporation Microphone array system and method for sound acquisition
US9462380B2 (en) 2008-08-29 2016-10-04 Biamp Systems Corporation Microphone array system and a method for sound acquisition

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US5848170A (en) 1998-12-08
DE69629095D1 (de) 2003-08-21
FR2742960B1 (fr) 1998-02-20
EP0781070B1 (de) 2003-07-16
FR2742960A1 (fr) 1997-06-27

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